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A comparison between ARC (1965) and AFRC (1991) phosphorus requirements for ewes

Published online by Cambridge University Press:  05 November 2021

J.J. Parkins ,
R.G. Hemingway  and
C.L. Adam
J.J. Parkins
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH, United Kingdom
R.G. Hemingway
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH, United Kingdom
C.L. Adam
Affiliation:
Present address, Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB, United Kingdom
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Extract

Beef cows given a diet severely inadequate in phosphorus (P) from 16 weeks before calving maintained appetite until 3-6 weeks after calving when plasma P concentrations were below 1.0 mmol/1 (Bass et al. 1981). The objective of this experiment was to compare the adequacy of ARC (1965) and AFRC (1991) dietary P inputs for ewes in relation to dry matter (DM) intake, plasma P concentration and early lamb growth.

Blackface ewes (˃ 3 lambings, n=87, mean liveweight (LW) 53.9, s.d. 5.1kg)) were mated to Border Leicester rams and then randomly allocated to three equal groups according to LW and expected lambing date.

Type
Programme
Information
Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 215
Copyright
Copyright © The British Society of Animal Science 1998

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References

Agricultural Research Council. 1965. The Nutrient Requirements of Farm Livestock. No. 2 Ruminants. London: H.M.S.O.Google Scholar
Agricultural and Food Research Council 1991. Technical Committee on Responses to Nutrients. Report No 6. A reappraisal of the calcium and phosphorus requirements of sheep and cattle. Nutrition Abstracts and Reviews 61: 573–612.Google Scholar
Bass, J.M., Fishwick, G., Hemingway, R.G., Parkins, J.J. and Ritchie, N.S. 1981. The effects of supplementary phosphorus on the voluntary consumption and digestibity of a low phosphorus straw-based diet given to beef cows during pregnancy and early lactation. Journal of Agricultural Science, Cambridge 97: 365–372.10.1017/S002185960004079XCrossRefGoogle Scholar