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Responses in dry matter intakes and plasma phosphorus concentrations in ewes given phosphorus sources of contrasting rumen solubility

Published online by Cambridge University Press:  05 November 2021

J.J. Parkins  and
R.G. Hemingway
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
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Extract

Full rumination and feed dry matter (DM) intake require adequate recirculation of soluble phosphorus (P) and nitrogen (as urea) via saliva. Both decrease following periods of inadequate dietary intake, which may be prolonged for P with adults. Earlier studies, using 23 μm mesh nylon bags in cannulated cows, showed that rumen solubility coefficients of P in granular mono-calcium phosphate (MCP), powdered di-calcium phosphate (DCP) and granular defluorinated phosphate (DFP) were respectively 0.85, 0.14 and 0.03. This communication describes their relative ability to enhance plasma P and voluntary DM intake by ewes after lambing following development of aphosphorosis when given a low P diet (LP) throughout pregnancy (Parkins et al. 1998).

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Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 214
Copyright
Copyright © The British Society of Animal Science 1998

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References

Parkins, J.J., Hemingway, R.G. and Adam, C.L. 1998. A comparison between ARC (1965) and AFRC (1991) phosphorus requirements for ewes; Proceedings of the British Society of Animal Science (In the press).10.1017/S0308229600034280CrossRefGoogle 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