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Phosphorus pollution by dairy cows and its mitigation by dietary manipulation

Published online by Cambridge University Press:  20 November 2017

E. Kebreab
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, Reading RG6 6AT, U.K.
L.A. Crompton
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, Reading RG6 6AT, U.K.
J.A.N. Mills
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, Reading RG6 6AT, U.K.
J. France
Affiliation:
Department of Agriculture, The University of Reading, Earley Gate, Reading RG6 6AT, U.K.
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Extract

Phosphorus (P) is a key mineral in energy metabolism and is essential in nearly every biochemical aspect of dairy cow metabolism. Therefore, P needs to be supplied in sufficient quantity to optimize animal performance. However, dairy cows only use 30 – 45% of their dietary P intake and the rest is excreted mainly in faeces. Excess faecal excretion can lead to P accumulation and saturation in the soil and filter into groundwater or remain in surface water (Tamminga, 1996), which is known to cause eutrophication. It is therefore desirable to formulate P rations according to the requirement of the animals and thereby reduce P pollution. The objective of the present study was to develop a dynamic model of P metabolism in dairy cows and use that to identify and quantify trends of P excretion as a function of P intake and investigate effects of energy supplementation on P utilisation.

Type
Poster Presentations
Copyright
Copyright © The British Society of Animal Science 2001

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References

ACSL Model. 1996. ACSL Model User’s Guide (version 1.2). MGA Software: Concord, MA, USA.Google Scholar
AFRC, 1991. A reappraisal of the calcium and phosphorus requirements of sheep and cattle. Nutr. Abst. Rev. 61: 573612.Google Scholar
Tamminga, S. 1996. A review on environmental impacts of nutritional strategies in ruminants. J. Anim. Sci. 74: 31123124.CrossRefGoogle ScholarPubMed
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