Rothamsted Research

where knowledge grows

orr

Robert Orr

Role(s):
Farm Platform Manager
North Wyke
North Wyke
Phone:
+44 (0) 1837 883 500 ext: +44 1837 883546
Location:
Rothamsted Research - North Wyke, Okehampton, Devon, EX20 2SB
Past Projects
Member
  • Diversification of grassland through the manipulation of plant-soil interactions and the identification of indicators of restorability (DIGFOR)
  • Sustainable management systems for unimproved neutral grassland
  • Widescale Enhancement of Biodiversity: Effects on other resources (WEB)
  • Techniques to enhance the establishment and persistence of poor-performing species in grassland restoration
  • Understanding the behaviour of pollutants through cracking clay soils
  • Widescale Enhancement of Biodiversity: a multi-functional approach (WEB Phase 2)

 

 

Refereed Journal Papers

57. ELUDOYIN A.O., GRIFFITH B.A., ORR R.J., BOL R., QUINE T.A. and BRAZIER R.E. (2016) An evaluation of the hysteresis in chemical concentration-discharge (C-Q) relationships from drained, intensively managed grasslands in southwest England. Hydrological Sciences Journal (In press)

56. ORR R.J., MURRAY P.J., EYLES C.J., BLACKWELL M.S.A., CARDENAS L.M., COLLINS A.L., DUNGAIT J.A.J., GOULDING K.W.T., GRIFFITH B.A., GURR S.J., HARRIS P., HAWKINS J.M.B., MISSELBROOK T.H., RAWLINGS C., SHEPHERD A., SINT H., TAKAHASHI T., TOZER K.N., WHITMORE A.P., WU L. and LEE M.R.F. (2016) The North Wyke Farm Platform: effect of temperate grassland farming systems on soil moisture contents, runoff and associated water quality dynamics. European Journal of Soil Science 67, 374 - 385.

55. WOODCOCK B.A., SAVAGE J., BULLOCK J.M., NOWAKOWSKI M., ORR R., TALLOWIN J.R.B. and PYWELL, R.F. (2014) Enhancing floral resources for pollinators in productive agricultural grasslands. Biological Conservation 171, 44-51.

54. ORR R.J., TALLOWIN J.R.B., GRIFFITH B.A. and RUTTER S.M. (2014) Effects of livestock breed and rearing experience on foraging behaviour of yearling beef cattle grazing unimproved grasslands. Grass and Forage Science 69, 90-103.

53. WOODCOCK B.A., SAVAGE J., BULLOCK J.M., NOWAKOWSKI M., ORR R., TALLOWIN J.R.B. and PYWELL, R.F. (2013) Enhancing beetle and spider communities in agricultural grasslands: the roles of seed addition and habitat management. Agriculture, Ecosystems and Environment 167, 79-85.

52. ORR R.J., TOZER K.N., GRIFFITH B.A., CHAMPION R.A., COOK J.E. and RUTTER S.M. (2012) Foraging paths through vegetation patches for beef cattle in semi-natural pastures. Applied Animal Behaviour Science. 141,1-8.

51. ORR R.J., GRIFFITH B.A., CHAMPION R.A. and COOK J.E. (2012) Defaecation and urination behaviour in beef cattle grazing semi-natural grassland. Applied Animal Behaviour Science. 139, 18–25.

50. ORR R.J., GRIFFITH B.A., COOK J.E. and CHAMPION R.A. (2012) Ingestion and excretion of nitrogen and phosphorus by beef cattle under contrasting grazing intensities. Grass and Forage Science 67, 111-118.

49. WOODCOCK B.A., BULLOCK J.M., NOWAKOWSKI M., ORR R.J., TALLOWIN J.R.B. and PYWELL R.F. (2012) Enhancing floral diversity to increase the robustness of grassland beetle assemblages to environmental change. Conservation Letters 5, 459-469.

48. SODER K.J., SANDERSON M.A., GREGORINI P., ORR R.J., RUBANO M.D. and ROOK A.J. (2009) Relationship of bite mass of cattle to sward structure of four temperate grasses in short-term grazing sessions. Grass and Forage Science 64, 421-431.

47. SODER K.J., ORR R.J., RUBANO M.D. and ROOK, A. J. (2009) Use of a micro-sward technique for determining bite mass of four grass species in short-term tests. Euphytica 168, 135-143.

46. ORR R.J., COOK J.E., YOUNG K.L., CHAMPION R.A. and RUTTER S.M. (2005) Intake characteristics of perennial ryegrass varieties when grazed by yearling beef cattle under rotational stocking management. Grass and Forage Science 60, 157-167.

45. ORR R.J., YOUNG K.L., COOK J.E. and CHAMPION R.A. (2005) Development of a micro-sward technique for determining intake characteristics of perennial ryegrass varieties. Euphtyica 141, 65-73.

44. ORR R.J., COOK J.E., CHAMPION R.A. and ROOK A.J. (2004) Relationships between morphological and chemical characteristics of perennial ryegrass varieties and intake by sheep under continuous stocking management. Grass and Forage Science 59, 389-398.

43. ORR R.J., RUTTER S.M., YARROW N.H., CHAMPION R.A. and ROOK A.J. (2004) Changes in ingestive behaviour of yearling dairy heifers due to changes in sward state during grazing down of rotationally-stocked ryegrass or white clover pastures. Applied Animal Behaviour Science 87, 205-222.

42. CHAMPION R.A., ORR R.J., PENNING P.D. and RUTTER S.M. (2004) The effect of the spatial scale of heterogeneity of two herbage species on the grazing behaviour of lactating sheep. Applied Animal Behaviour Science 88, 61-76.

41. ROOK A.J., HARVEY A., PARSONS A.J., ORR R.J. and RUTTER S.M. (2004) Bite dimensions and grazing movements by sheep and cattle grazing homogeneous perennial ryegrass swards. Applied Animal Behaviour Science 88, 227-242.

40. RUTTER S.M., ORR R.J., YARROW N.H., CHAMPION R.A. and ROOK A.J. (2004) Dietary preference of dairy cows grazing ryegrass and white clover. Journal of Dairy Science 87, 1317-1324.

39. RUTTER S.M., ORR R.J., YARROW N.H. and CHAMPION R.A. (2004) Dietary preference of dairy heifers grazing ryegrass and white clover, with and without an anti-bloat treatment. Applied Animal Behaviour Science 85, 1-10.

38. ORR R.J., COOK J.E., CHAMPION R.A., PENNING P.D. and ROOK A.J. (2003) Intake characteristics of perennial ryegrass varieties when grazed by sheep under continuous stocking management. Euphytica 134, 247-260.

37. RUTTER S.M., ORR R.J., PENNING P.D., YARROW N.H. and CHAMPION R.A. (2002) Ingestive behaviour of heifers grazing monocultures of ryegrass or white clover. Applied Animal Behaviour Science 76, 1-9.

36. ROOK A. J., HARVEY A., PARSONS A.J., PENNING P.D. and ORR R.J. (2002) Effect of long-term changes in relative resource availability on dietary preference of grazing sheep for perennial ryegrass and white clover. Grass and Forage Science 57, 54-60.

35. ORR R.J., MARTYN T.M. and CLEMENTS R.O. (2001) Evaluation of perennial ryegrass varieties under frequent cutting or continuous stocking with sheep. Plant Varieties and Seeds 14, 181-199.

34. ORR R.J., RUTTER S.M., PENNING P.D. and ROOK A.J. (2001) Matching grass supply to grazing patterns for dairy cows. Grass and Forage Science 56, 352-361.

33. ORR R.J., PENNING P.D., RUTTER S.M., CHAMPION R.A., HARVEY A. and ROOK A.J. (2001) Intake rate during meals and meal duration, for sheep in different hunger states, grazing grass or white clover swards. Applied Animal Behaviour Science 75, 33-45.

32. HARVEY A., PARSONS A.J., ROOK A.J., PENNING P.D. and ORR R.J. (2000) Dietary preference of sheep for perennial ryegrass and white clover at contrasting sward surface heights. Grass and Forage Science 55, 242-252.

31. ORR R.J., PENNING P.D., HARVEY A. and CHAMPION R.A. (1997) Diurnal patterns of intake rate by sheep grazing monocultures of ryegrass or white clover. Applied Animal Behaviour Science 52, 65-77.

30. PENNING P.D., NEWMAN J.A., PARSONS A.J., HARVEY A. and ORR R.J. (1997) Diet preferences of adult sheep and goats grazing ryegrass and white clover. Small Ruminant Research 24, 175-184.

29. PENNING P.D., JOHNSON R.H. and ORR R.J. (1996) Effects of continuous stocking with sheep or goats on sward composition and animal production from a grass and white clover pasture. Small Ruminant Research 21, 19-29.

28. PENNING P.D., PARSONS A.J., ORR R.J., HARVEY A. and CHAMPION R.A. (1995) Intake and behaviour responses by sheep in different physiological states, when grazing monocultures of grass or white clover. Applied Animal Behaviour Science 45, 63-78.

27. ORR R.J., PENNING P.D., PARSONS A.J. and CHAMPION R.A. (1995) Herbage intake and N excretion by sheep grazing monocultures or a mixture of grass and white clover. Grass and Forage Science 50, 31-40.

26. PENNING P.D., PARSONS A.J., ORR R.J. and HOOPER G.E. (1994) Intake and behaviour responses by sheep to changes in sward characteristics under rotational grazing. Grass and Forage Science 49, 476-486.

25. PARSONS A.J., NEWMAN J.A., PENNING P.D., HARVEY A. and ORR R.J. (1994) Diet preference of sheep: effects of recent diet, physiological state and species abundance. Journal of Animal Ecology 63, 465-478.

24. ORR R.J. and TREACHER T.T. (1994) The effect of concentrate level on the intake of silages or hays by ewes in the 1st month of lactation. Animal Production 58, 109-116.

23. NEWMAN J.A., PENNING P.D., PARSONS A.J., HARVEY A. and ORR R.J. (1994) Fasting affects intake behaviour and diet preference of grazing sheep. Animal Behaviour 47, 185-193.

22. PENNING P.D., PARSONS A.J., NEWMAN J.A., ORR R.J. and HARVEY A. (1993) The effects of group size on grazing time in sheep. Applied Animal Behaviour Science 37, 101-109.

21. PENNING P.D., ROOK A.J. and ORR R.J. (1991) Patterns of ingestive behaviour of sheep continuously stocked on monocultures of ryegrass or white clover. Applied Animal Behaviour Science 31, 237-250.

20. JARVIS S.C., HATCH D.J., ORR R.J. and REYNOLDS S.E. (1991) Micrometeorological studies of ammonia emission from sheep grazed swards. Journal of Agricultural Science, Cambridge 117, 101-109.

19. PARSONS A.J., ORR R.J., PENNING P.D. and LOCKYER D.R. (1991) Uptake, cycling and fate of nitrogen in grass-clover swards continuously grazed by sheep. Journal of Agricultural Science Cambridge, 116, 47-61.

18. PENNING P.D., PARSONS A.J., ORR R.J. and TREACHER T.T. (1991) Intake and behaviour responses by sheep to changes in sward characteristics under continuous stocking. Grass and Forage Science 46, 15-28.

17. ORR R.J. and TREACHER T.T. (1990) Intakes of silages, hays and straws by ewes in mid pregnancy. Animal Production 51, 301-310.

16. ORR R.J. and TREACHER T.T. (1990) The performance of ewes offered diets containing different proportions of perennial ryegrass and white clover silage in late pregnancy. Animal Production 51, 143-153.

15. ORR R.J., PARSONS A.J., PENNING P.D. and TREACHER T.T. (1990) Sward composition, animal performance and the potential production of grass/white clover swards continuously stocked with sheep. Grass and Forage Science 45, 325-336.

14. ORR R.J. and TREACHER T.T. (1989) The effect of concentrate level on the intake of grass silages by ewes in late pregnancy. Animal Production 48, 109-120.

13. PENNING P.D., ORR R.J. and TREACHER T.T. (1988) Responses of lactating ewes, offered fresh herbage indoors and when grazing, to supplements containing differing protein concentrations. Animal Production 46, 403-415.

12. ORR R.J., PARSONS A.J., TREACHER T.T. and PENNING P.D. (1988) Seasonal patterns of grass production under cutting or continuous stocking managements. Grass and Forage Science 43, 199-207.

11. NEAL H.D. St.C., FRANCE J., ORR R.J. and TREACHER T.T. (1985) A model to maximise hay intake when formulating rations for pregnant ewes. Animal Production 40, 93-100.

10. ORR R.J., TREACHER T.T. and MASON V.C. (1985) The effect of ammonia treatment on the intake of straw and hay when offered with rations of concentrates to ewes in late pregnancy. Animal Production 40, 101-109.

9. ORR R.J. and NEWTON J.E. (1984) Grazing cycle length and silage supplementation: Effects on the performance of lactating ewes with twin lambs. Grass and Forage Science 39, 323-329.

8. ORR R.J. and TREACHER T.T. (1984) The effect of concentrate level on the intake of hays by ewes in late pregnancy. Animal Production 39, 89-98.

7. ORR R.J. and NEWTON J.E. (1984) The effect of stocking rate on a lamb production system with February-lambing ewes. Grass and Forage Science 39, 27-34.

6. ORR R.J., NEWTON J.E. and JACKSON C.A. (1983) The intake and performance of ewes offered concentrates and grass silage in late pregnancy. Animal Production 36, 21-27.

5. YOUNG N.E., AUSTIN A.R., ORR R.J., NEWTON J.E. and TAYLOR R.J. (1982) A comparison of a hybrid stubble turnip (cv. Appin) with other cruciferous catch crops for lamb fattening. 2. Animal performance and toxicological evaluation. Grass and Forage Science 37, 39-46.

4. NEWTON J.E. and ORR R.J. (1981) The intake of silage and grazed herbage by Masham ewes with single or twin lambs and its repeatability during pregnancy, lactation and after weaning. Animal Production 33, 121-127.

3. YOUNG N.E., NEWTON J.E. and ORR R.J. (1980) The effect of a cereal supplement during early lactation on the performance and intake of ewes grazing perennial ryegrass at three stocking rates. Grass and Forage Science 35, 197-202.

2. ORR R.J., NEWTON J.E. and YOUNG N.E. (1979) A note on a comparison of different weaning policies for ewes suckling triplets at pasture. Animal Production 28, 275-278.

1. NEWTON J.E., YOUNG N.E. and ORR R.J. (1976) A comparison of the sown swards of perennial ryegrass S24 and Italian ryegrass RvP in a two-year lamb production system with different breeds of sheep. Journal of Agricultural Science, Cambridge 87, 605-616.

Abstracts of communications to societies, reviews and popular articles

98. MCAULIFFE G.A., TAKAHASHI T., EISLER M., HARRIS P., ORR R.J. and LEE M.R.F. (2016) Carbon footprint analysis of pasture-based beef production systems based on rich primary data at the North Wyke Farm Platform in Devon, UK. 10th International Conference on Life Cycle Assessment of Food, 19-21 October 2016, Dublin.

97. HARRIS P., SINT H.M., GRIFFITH B.A., HAWKINS J.M.B., EVANS J., ORR R.J. and LEE M.R.F. (2016) The North Wyke Farm Platform: Data Portal. Proceedings of the 26th General Meeting of the European Grassland Federation, 4-8 September, Trondheim, Norway. pp. 618-620.

96. CARDENAS L.M., DUNN R.M., MISSELBROOKT.H., HARRIS P., BROCCOLO F., ORR R.J. and LEE M.R.F. (2016) The North Wyke Farm Platform: the impact of ploughing, cultivations and reseeding on emissions of CO2 and N2O. Proceedings of the 26th General Meeting of the European Grassland Federation, 4-8 September, Trondheim, Norway. pp. 838-840.

95. HARRIS P., BRUNSDON C., COMBER A., SINT H.M., ORR R.J., LEE M.R.F. and MURRAY P. (2016) Modelling, interpreting and visualizing uncertainties for the North Wyke Farm Platform baseline field surveys. Spatial Accuracy 2016, Montpellier, France. 5-8 July 2016.

94. HARRIS P., GRIFFITH B., SINT H., HAWKINS J., COLLINS A., WU L., CARDENAS L., MISSELBROOK T., BLACKWELL M., DUNGAIT J., MURRAY P., ORR R.J. and LEE M. (2016) Data mining the North Wyke Farm Platform data sets. Steps to Sustainable Livestock, 12-15 January 2016, Bristol, UK.

93. DUNN R.M., BODEN J., MISSELBROOK T., ORR R.J., GRIFFITH B., NEALE J. and CARDENAS L.M. (2016) Greenhouse gas emissions from a reseeded grassland on the North Wyke Farm Platform. Steps to Sustainable Livestock, 12-15 January 2016, Bristol, UK.

92. HARRIS P., DUNGAIT J., GRIFFITH B., SHEPHERD A., SINT H., BLACKWELL M., CARDENAS L., COLLINS A., LEE M. and ORR R.J. (2015): The North Wyke Farm Platform, a UK national capability for research into sustainability of temperate agricultural grassland management: progress and developments. EGU General Assembly 2015, 12 - 17 April, Vienna, Austria. Paper 15883.

91. CARDENAS L., CHADWICK D., MISSELBROOK T., DONOVAN N., DUNN R., GRIFFITH B., ORR R., SMITH K., REES R., BELL M., WATSON C., McGEOUGH K., McNEILL G., WILLIAMS J., CLOY J., THORMAN R. and DHANOA M. (2015) Heterogeneity of gaseous emissions in soils-spatial vs temporal variability. EGU General Assembly 2015, 12 - 17 April, Vienna, Austria. Paper 13863.

90. MISSELBROOK T., HARRIS P., GRIFFITH B. and ORR R.J. (2014) The North Wyke Farm Platform: Opportunities for the LiveM network. International Livestock Modelling and Research Colloquium, 14-16 October, Bilbao, Spain.

89.  THOMPSON J.B., ORR R.J., DUNGAIT J., MURRAY P.J. and LEE M.R.F. (2014) Beef productivity on the North Wyke Farm Platform in two baseline years. Grassland Science in Europe, Vol. 19 – EGF at 50: the Future of European Grasslands. p. 644-646.

88. HARRIS P., GRIFFITH B.A., SHEPHERD A., PEUKERT S., HAWKINS J.M.B., ELYES C., WHITMORE A., BLACKWELL M.S.A., BRAZIER R.E., CARDENAS L.M., Wu L., DUNGAIT J.A.J., COLLINS A.L., GURR S., MURRAY P.J., GOULDING K.W. and ORR R.J. (2014) The North Wyke Farm Platform, a national capability for research into sustainability of temperate agricultural grassland management: data and modelling opportunities. Terrestial Environmental Observatories (Tereno) International Conference, Bonn, 29 Sept – 2 Oct 2014.

87. GRIFFITH B.A., HARRIS P., SHEPHERD A., PEUKERT S., HAWKINS J.M.B., ELYES C., WHITMORE A., BLACKWELL M.S.A., BRAZIER R.E., CARDENAS L.M., Wu L., DUNGAIT J.A.J., COLLINS A.L., GURR S., MURRAY P.J., GOULDING K.W. and ORR R.J. (2014) The North Wyke Farm Platform, a national capability for research into sustainability of temperate agricultural grassland management: Infrastructure and instrumentation. Terrestial Environmental Observatories (Tereno) International Conference, Bonn, 29 Sept – 2 Oct 2014.

86. SHEPHERD A., HARRIS P., ORR R.J., GRIFFITH B. and MURRAY P. (2014) Applications of high resolution remote sensing with spatial modelling for sustainable grassland agriculture. 16th Annual Conference of the International Association for Mathematical Geosciences, 17-20 October 2014, New Delhi, India.

85. HARRIS P., HOWDEN N.J.K., PEUKERT S., NOACCO V., RAMEZANI K., TUOMINEN E., ELUDOYIN A., BRAZIER R., SHEPHERD A., GRIFFITH B., ORR R. and MURRAY P. (2014) Contextualized geographically weighted principal components analysis for investigating baseline soils data on the North Wyke Farm Platform. 16th Annual Conference of the International Association for Mathematical Geosciences, 17-20 October 2014, New Delhi, India.

 84. SHEPHERD A., ORR R.J., HARRIS P., GRIFFITH B.A. and MURRAY P.J. (2014) Applications of spatial modelling and UAVs to pasture agri-research on the North Wyke Farm Platform. In: New sensors for a changing world. Remote Sensing and Photogrammetry Society, September 2014, Aberystwyth, Wales. p. 169.

83. MURRAY P.J., GRIFFITH B.A., ORR R.J., PEUKERT S. and SHEPHERD A. (2013) The North Wyke Farm Platform - A new National Capability for investigating sustainable intensification of livestock production. Sustainable intensification: The pathway to low carbon farming ? 25 - 27 September 2013, SRUC, Edinburgh.pp. 179-180.

82. MURRAY P.J., GRIFFITH B.A., ORR R.J., SHEPHERD A., BLACKWELL M.S.A., HAWKINS J.M.B. and PEUKERT S. (2013) The North Wyke Farm Platform: A new UK national capability for research into sustainability of agricultural temperate grassland management. Water resources and catchment management in grassland and forage systems. 22nd International Grasslands Congress, 15 – 19 September 2013 Sydney, Australia. pp. 1931-1933.

81. GRIFFITH B.A., HAWKINS J.M.B., ORR R.J., BLACKWELL M.S.A., and MURRAY P.J. (2013) The North Wyke Farm Platform: methodologies used in the remote sensing of the quantity and quality of drainage water. Water resources and catchment management in grassland and forage systems. 22nd International Grasslands Congress, 15 – 19 September 2013 Sydney, Australia. pp. 1453-1455.

80. ELUDOYIN A.O., BRAZIER R., QUINE T., BOL R., ORR R.J. and GRIFFITH B. (2012) Improved understanding of solute concentration-discharge dynamics through state-of-the-art antecedent moisture content (AMC) monitoring and analysis. Geophysical Research Abstracts, EGU General Assembly, Vienna, Austria, April 2012, pp. 1060.

79. ORR R.J., GRIFFITH B.A., ROSE S., HATCH D.J., HAWKINS J.M.B. and MURRAY P.J. (2011) Designing and creating the North Wyke Farm Platform. Catchment Science 2011, 14 – 16 September, Dublin, Ireland. p. 35.

78. HATCH D.J., MURRAY P.J., ORR R.J. and GRIFFITH B.A. (2011) The North Wyke Farm Platform: A UK national capability for ari-environmental research. In: Agricultural Ecology Research: Its role in delivering sustainable farm systems. Aspects of Applied Biology 109, 115-118.

77. PILGRIM E., MACLEOD C.J.A., BEAUMONT D., BLACKWELL M.S.A., BOL R., DEL PRADO A., GRIFFITH B., ORR R.J., SHEPHERD A., WU L. and FIRBANK L.G. (2010) Learning how to model ecosystem trade-offs at the farm scale. In: International Congress on Environmental Modelling and Software Modelling for Environment’s Sake. International Environmental Modelling and Software Society, 5th Biennial Meeting, Ottawa, Canada

76. PYWELL R.F., WOODCOCK B., ORR R.J., TALLOWIN J.R.B., MCEWAN I., NOWAKOWSKI M. and BULLOCK J.M. (2010) Options for wide scale enhancement of grassland biodiversity under the Entry Level Scheme. In: AAB 100. Agri-environment schemes – what have they achieved and where do we go from here? Aspects of Applied Biology, 125-132.

75. DIXON E., HENEHAN M.J., ORR R.J., HATCH D.J. and BOL R. (2008) Carbon and nitrogen stable isotope composition of cattle hair: Ecological fingerprints of water availability in grassland production systems. Poster presented at JESIUM (Joint European Stable Isotope Users Meeting) August 31st to 5th September 2008 in Presqu Ile de Giens, France.

74. ORR R.J., COOK J.E., YOUNG K.L. and ROOK A.J. (2005) Intake characteristics of diploid and tetraploid perennial ryegrass varieties when grazed by Simmental x Holstein yearling heifers under rotational stocking management. 20th International Grassland Congress, Cork Satellite Workshop, Session 1: Appropriate plants for grazing, Ireland, 3-6 July 2005.

73. ROOK A.J., TALLOWIN J.R.B., RUTTER S.M., ORR R.J., HOPKINS A. and GIBB M.J. (2005) Behavioural and community ecology:understanding mechanisms driving biodiversity in pasture-based systems.  In: Gordon A.J. (ed.) IGER Innovations No. 9, pp.54-57.

72. ORR R.J. and ROOK A.J. (2003) Intake characteristics and plant traits for perennial ryegrass varieties grazed by sheep. In: Crop quality: its role in sustainable livestock production. Proceedings of the Association of Applied Biologists, Manchester, December 2003. Aspects of Applied Biology 70: 169-174.

71. MAYLAND H.F., MacADAM J.W., ORR R.J., ROOK A.J., SHEWMAKER G.E. and HARRISON P.A. (2003) Total nonstructural carbohydrate in tall fescue leaves and sheaths after light and dark exposure. 2nd National Conference on Grazing Lands, Nashville, Tennessee, 7-10 December 2003, p.833.

70. COOK J.E, CHAMPION R.A. and ORR R.J. (2003) Morphological, chemical and intake characteristics of grass varieties grazed by sheep under continuous stocking management. 7th BGS Research Meeting, Aberystwyth, Sept. 2003.

69. LISTER S.J. and ORR R.J. (2003) NIRS prediction of the intake characteristics of grass varieties continuously stocked with sheep. 7th BGS Research Meeting, Aberystwyth, Sept. 2003.

68. YOUNG K.L, COOK J.E., CHAMPION R.A. and ORR R.J. (2003) Development of a sward box methodology for the rapid-screening of bite mass in grass varieties intended for grazing. 7th BGS Research Meeting, Aberystwyth, Sept. 2003.

67. ORR R.J. and COOK J.E. (2003) New methods for identification and evaluation of intake characteristics of grass varieties. In: Gordon A.J. (ed.) IGER Innovations No. 7, pp.30-33.

66. ROOK, A. J., ORR, R. J., RUTTER, S. M. and MOORBY, J. M. (2002) Intake and dietary choices by grazing ruminants, effects of time of day and water soluble carbohydrate content in forage. Invited paper, American Society of Agronomy Annual Meeting, 10-14 November 2002, Indianapolis, USA.

65. GIBB, M.J., ORR, R.J., RUTTER, S.M. and HUCKLE, C.A. (2001) Ingestive behaviour and management of animals at pasture. In: Wade, M.H. (ed) Manejo del Pastoreo, Meeting of the Argentinean Association of Animal Production, Universidad Nacional de Lujn, November 2001.

64. ORR R.J., COOK J.E., CHAMPION R.A. and ROOK A.J. (2001) Intake characteristics and performance of contrasting grass varieties continuously stocked with sheep. Proceedings of the 19th International Grassland Congress, Theme 13: Plant improvement, Sao Paulo, Brazil, 11-21 February 2001.

63. ORR R.J. (2000) Assessing grass variety performance under sheep grazing. Journal of the British Sheep Dairying association 17, 15-18.

62. ORR R.J. (2000) Key to low input production. Beef Farmer - Summer 2000. The Journal of the National Beef Association, pp.26-28.

61. YARROW N.H., ORR R.J. and SHIELDS R.W. (2000) Practice into profit: Low-input heifer beef production. In: Beef from Grass and Forage, (ed. D. Pullar), British Grassland Society, Stafford, November 2000, pp.173-174.

60. ORR R.J., RUTTER S.M., PENNING P.D., YARROW N.H., CHAMPION R.A. and ROOK A.J. (2000) Ingestive behaviour by dairy heifers grazing grass or white clover swards under rotational stocking management. 6th BGS Research Meeting, Aberdeen, Sept. 2000. pp. 41-42.

59. COOK J.E., CHAMPION R.A., ORR R.J. and ROOK A.J. (2000) Intake rate, grazing time and daily intake by sheep grazing perennial ryegrass varieties under continuous stocking management. 6th BGS Research Meeting, Aberdeen, Sept. 2000. pp. 67-68.

58. ORR R.J., COOK J.E., ATKINSON L.D., CLEMENTS R.O. and MARTYN T.M. (2000) Evaluation of herbage varieties under continuous stocking. In: Grazing management British Grassland Society Occasional Symposium No. 34. British Grassland Society, Harrogate, February 2000. pp. 39-44.

57. RUTTER S.M., ORR R.J. and ROOK A.J. (2000) Dietary preference for grass and white clover in sheep and cattle: an overview. In: Grazing management, British Grassland Society Occasional Symposium No. 34. British Grassland Society, Harrogate, February 2000. pp. 73-78.

56. PENNING P.D., ORR R.J., PARSONS A.J. and HARVEY A. (1999) How do cattle and sheep alter ingestive behaviour in response to changes in sward state ? In: Proceedings of the 18th International Grassland Congress, Winnipeg, Manitoba, Saskatoon, Saskatchewan, Canada, June 1997, Paper No. 409.

55. ROOK A. J., GIBB M. J. and ORR R. J. (1999) Matching food supply to animals natural meal patterns. 5th International Symposium on the Nutrition of Herbivores, San Antonio, Texas, 11-16 April 1999.

54. RUTTER S.M., ORR R. J., YARROW N.H., CHAMPION R.A., ATKINSON L.D. and COOK J.E. (1999) Long-term dietary preference for grass and clover in dairy cows, 5th International Symposium on the Nutrition of Herbivores, San Antonio, Texas, 11-16 April 1999.

53. ORR R.J. (1999) The assessment of quality - grazing and intake. Novel Material and the Assessment of Quality, Quality Feeds Theme Development Group Workshop, IGER Aberystwyth, 12 January 1999.

52. ORR R.J. (1998) Efficient use of grazed herbage by dairy cows. Report to the Milk Development Council, Contract Ref. 96/R3/06.

51. HARVEY A. and ORR R. J. (1998) Techniques for measuring bite dimensions and movement patterns within and between grazing bouts for cattle and sheep. IXth European Intake Workshop, North Wyke, 18-20 November 1998, pp 79-80.

50. CHAMPION R.A., RUTTER S.M., ORR R.J. and PENNING P.D. (1998) Costs of locomotive and ingestive behaviour by sheep grazing grass or clover monocultures or mixtures of the two species. Proceedings of the 32nd International Congress of the ISAE, Clermont Ferrand, July 1998. 

49. HARVEY A., PARSONS A.J., ORR R.J., RUTTER S.M. and ROOK A.J. (1998) Movement patterns of sheep and cattle within and between continuous short-term grazing bouts. Proceedings of the 32nd International Congress of the ISAE, Clermont Ferrand, July 1998. 

48. ORR R.J., RUTTER S.M., PENNING P.D., YARROW N.H., ATKINSON L.D. and CHAMPION R.A. (1998) Matching grass supply to grazing patterns for dairy cows under strip-grazing management. BSAS Winter Meeting, Scarborough, March 1998. pp. 49.

47. RUTTER S.M., ORR R.J., PENNING P.D., YARROW N.H., CHAMPION R.A. and ATKINSON L.D. (1998) Dietary preference of dairy cows grazing grass and clover. BSAS Winter Meeting, Scarborough, March 1998, p. 51.

46. PENNING P.D., GIBB M.J., PARSONS A.J., ORR R.J. and HARVEY A. (1998) Behavioural and physiological factors limiting intake by grazing ruminants. Concerted Action: AIR-CT93-0947, Joint meeting of Pasture Ecology/ Animal Intake Groups, Dublin, September 1996.

45. GIBB M.J. and ORR R.J. (1997) Grazing behaviour of ruminants. In: Gordon A.J. (ed.) IGER Innovations No. 1, pp. 54-57.

44. ORR R.J., RUTTER S.M., PENNING P.D., YARROW N.H. and CHAMPION R.A. (1997) Sward state and ingestive behaviour by Friesian dairy heifers under rotational grazing. 5th BGS Research Meeting, Seale Hayne, Sept. 97, pp. 51-52.

43. ORR R.J., HARVEY A., KELLY C.L. and PENNING P.D. (1997) Bite dimensions and grazing severity for cattle and sheep. 5th BGS Research Meeting, Seale Hayne, Sept. 97, pp.185-186.

42. CHAMPION R.A., RUTTER S.M., and ORR R.J. (1997) Distinguishing bites and chews in recordings of the grazing jaw movements of cattle. 5th BGS Research Meeting, Seale Hayne, Sept. 97, pp. 171-172.

41. HARVEY A., ORR R.J. and PENNING P.D. (1997) Does supplementation of different feed types alter the preference by grazing ewes for grass and clover ? 5th BGS Research Meeting, Seale Hayne, Sept. 97, pp. 177-178.

40. KELLY C.L., PENNING P.D., ORR R.J. and CHAMPION R.A. (1997) Rates of passage of digesta in sheep grazing grass or white clover. 5th BGS Research Meeting, Seale Hayne, Sept. 97, pp. 181-182.

39. RUTTER S. M., PENNING P. D., ROOK A. J., ORR R. J., GIBB M. J., CHAMPION R. A. and HUCKLE C. A. (1997) An algorithm for the automatic processing of recordings of foraging behaviour by cattle. In: P.Hemsworth and M.Spinka (eds), 31st International Congress of the International Society for Applied Ethology, Prague, August 1997, p. 216.

38. PENNING P.D., ORR R.J., PARSONS A.J. and HARVEY A. (1997) How do cattle and sheep alter ingestive behaviour in response to changes in sward state ? 18th International Grassland Congress, Canada, June 1997, Paper No. 409.

37. RUTTER S.M., PENNING P.D., PARSONS A.J., HARVEY A. and ORR R.J. (1997) Dietary preferences of domestic ruminants. In: Animal Choices, BSAS Occasional Symposium No. 20, pp. 96-97.

36. RUTTER S.M., PENNING P.D., CHAMPION R.A. and ORR R.J. (1996) Why can't dairy heifers graze clover quicker than grass? Proceedings of the 30th International Congress of the ISAE, Guelph, Canada, August 1996, p.134.

35. ORR R.J, RUTTER S.M., PENNING P.D.,YARROW N.H. and CHAMPION R.A. (1996) Grazing behaviour and herbage intake rate by Friesian dairy heifers grazing ryegrass or white clover. Legumes in Sustainable Farming Systems, BGS Occasional Symposium no.30, p.221-224.

34. HARVEY A., ORR R.J., PARSONS A.J., PENNING P.D. and VINCENT J.F.V. (1996) The effects of grass nitrogen status on the preference by sheep grazing ryegrass and white clover. Legumes in Sustainable Farming Systems, BGS Occasional Symposium no.30, p.227-229.

33. HARVEY A. and ORR R.J. (1996) The effects of spatial aggregation of grass and clover swards grazed by sheep on diet and sward composition. Paper 162. Animal Science, 62, 665.

32. HARVEY A. and ORR R.J. (1996) Dietary preference of sheep for grass and clover at contrasting sward surface heights. Paper 161. Animal Science, 62, 665.

31. PENNING P.D., NEWMAN J.A., PARSONS A.J., HARVEY A. and ORR R.J. (1995) The preference of adult sheep and goats grazing ryegrass and white clover. Ann. Zootech., 44, 113.

30. PENNING P.D., ORR R.J., PARSONS A.J., HARVEY A. and NEWMAN J.A. (1995) Herbage intake rates and grazing behaviour of sheep and goats grazing grass or white clover. Ann. Zootech., 44,109.

29. ORR R.J., PENNING P.D., PARSONS A.J., HARVEY A. and NEWMAN J.A. (1995) The role of learning and experience in the development of dietary choice by sheep and goats. Ann. Zootech., 44,111.

28. PENNING P.D., PARSONS A.J., ORR R.J., HARVEY A. and YARROW N.H. (1995) Dietary preference of heifers for grass or clover, with and without romensin slow-release anti-bloat boluses. Animal Science, 60, 550.

27. ORR R.J., HARVEY A. and CHAMPION R.A. (1994) Diurnal patterns of ingestive behaviour by sheep. Proceedings of the 4th British Grassland Society Research Conference, University of Reading 26-28 September 1994. pp.145-146.

26. PENNING P.D., PARSONS A.J., ORR R.J. and HARVEY A. (1994) Intake behaviour and production responses by sheep, in different physiological states, grazing monocultures of grass or white clover. Proceedings of the 45th EAAP Meeting, 5-8 September, Edinburgh. S5.16 p.281.

25. DUMONT B., PENNING P.D., ORR R.J. and D'HOUR P. (1994) Effects of some factors on insensible weight loss in grazing sheep. Ann. Zootech. 43, 283.

24. PENNING P.D., ORR R.J., PARSONS A.J. and RUTTER S.M. (1993) Factors controlling meal duration and herbage intake rate by grazing sheep. Proceedings of the International Congress on Applied Ethology, 26-30 July 1993, Berlin, Germany. p.498-500.

23. PENNING P.D., PARSONS A.J., HARVEY A. and ORR R.J. (1993) Dietary preferences of sheep and goats. Proceedings from Agricultural and Environmental Management - Pointers for Change, National Agricultural Conference, Stoneleigh. 8 April 1993.

22. HARVEY A. and ORR R.J. (1992) Sheep preferences: evidence of partial and changing dietary preference for grass and white clover. Proceedings of the 3rd British Grassland Society Research Conference, Greenmount College, Co. Antrim 2-4 September 1992.

21. PENNING P.D., PARSONS A.J., HOOPER G.E. and ORR R.J. (1989) Responses in ingestive behaviour by sheep to changes in sward stucture. Proceedings of the 16th International Grassland Congress, Nice. October 1989.pp.791-792.

20. MACDUFF J.H., JARVIS S.C. and ORR R.J. (1989) Nitrate leaching from grazed grassland. Proceedings of a Meeting on Plant and Soil Metabolism, Lancaster. Agricultural and Food Research Council, September 1989. Paper 17.

19. PARSONS A.J., PENNING P.D., ORR R.J. and JARVIS S.C. (1988) Grass-clover swards - the answer to nitrogen pollution? New Farmer and Grower - Journal of Organic Food Production. pp. 27-28.

18. ORR R.J. and TREACHER T.T. (1987) Effects of ratio of white clover to grass in silage and concentrate supplementation on intake and performance of ewes in late pregnancy. Animal Production, 44, 481.

17. ORR R.J., PENNING P.D., PARSONS A.J. and TREACHER T.T. (1987) Effect of sward surface height of mixed swards of ryegrass/white clover on the intake and performance by ewes and their twin lambs. Animal Production, 44, 470.

16. PARSONS A.J., PENNING P.D., ORR R.J. and JARVIS S.C. (1987) Are grass-clover swards the answer to nitrogen pollution? In: Science, Agriculture and the Environment, (ed. J.E.Y. Hardcastle) Agricultural and Food Research Council, London. pp.10-11.

15. NEAL H.D. St. C., TREACHER T.T. and ORR R.J. (1986) Developing and using a computer program to ration ewes during late pregnancy. In: Science and Quality Lamb Production, (ed. J.E.Y. Hardcastle) Agricultural and Food Research Council, London. pp.10-11.

14. PARSONS A.J., TREACHER T.T. and ORR R.J. (1986) Increasing the efficiency of continuously grazed grassland. In: Science and Quality Lamb Production, (ed. J.E.Y. Hardcastle) Agricultural and Food Research Council, London. pp.14-15.

13. TREACHER T.T., ORR R.J. and PARSONS A.J. (1986) Direct measurement of the seasonal pattern of production on continuously-stocked swards. In: Grazing (ed. J. Frame) British Grassland Society, Occasional Symposium No. 19.

12. GIBB M.J., RIDOUT M.S., ORR R.J., PENNING P.D., BAKER R.D. and TREACHER T.T. (1985) Observations on the distribution of height measurements in swards stocked continuously with cattle or sheep. Animal Production, 40, 531.

11. TREACHER T.T. and ORR R.J. (1985) Silage intakes and replacement rates by ewes offered ad libitum silage and rations of concentrates in late pregnancy. Animal Production, 40, 522.

10. TREACHER T.T., PENNING P.D., ORR R.J. and PARSONS A.J. (1984) Effect of sward height on ewe and lamb performance and pasture growth in continuously stocked pastures. Proceedings of the 35th EAAP Meeting, The Hague. Poster Session, p.3.

9. NEWTON J.E., BETTS J.E., ORR R.J., WILDE R.M. and DHANOA M.S. (1982) The effect of time of lambing on sheep production. Grassland Research Institute, Technical Report No. 30.

8. TREACHER T.T. and ORR R.J. (1982) The effect of hay quality and level of concentrate intake on the voluntary intake of hay by ewes in late pregnancy. Animal Production, 34, 372.

7. YOUNG N.E., AUSTIN A.R., NEWTON J.E. and ORR R.J. (1981) The performance and intake of lambs grazing forage crops. Animal Production, 32, 384.

6. ORR R.J. and TREACHER T.T. (1981) The effect of concentrate level on the voluntary intake of low-quality hay by ewes in late pregnancy. Animal Production, 32, 364.

5. ORR R.J. and NEWTON J.E. (1980) The effects of different grazing cycle length and supplementation with silage on grass and sheep production. Grass and Forage Science, 36, 137.

4. ORR R.J. and NEWTON J.E. (1979) The effect of litter size on the intake and performance of ewes offered concentrates and grass silage in late pregnancy. Animal Production, 28, 451.

3. ORR R.J., NEWTON J.E. and YOUNG N.E. (1977) A comparison of three weaning policies on the performance of ewes rearing triplets at pasture. Animal Production, 24, 134.

2. YOUNG N.E., NEWTON J.E. and ORR R.J. (1977) The performance and intake of supplemented and unsupplemented ewes at pasture during early lactation. Journal of the British Grassland Society, 32, 54.

1. YOUNG N.E., ORR R.J. and NEWTON J.E. (1976) A comparison of four diets for housed pregnant ewes. Animal Production, 22, 148.