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J Sci Food Agric. 2016 Mar 15;96(4):1386-9. doi: 10.1002/jsfa.7235. Epub 2015 May 19.

Faecal excretion of total and acid extractable phosphorus in dairy cows fed rations with different levels of phosphorus.

Author information

1
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, P.O. Box 7024, SE750, 07 Uppsala, Sweden.

Abstract

BACKGROUND:

The phosphorus (P) originating from livestock operations causes eutrophication. Determination of acid extractable P (AEP) in cattle faeces has been proposed as a tool to identify excessive P feeding. The method has not yet been evaluated in controlled studies with cows subjected to individual recording of P intake. Thus the present study focused on investigating the relationship between different P fractions in faeces from cows fed rations with varying P content. The study also investigated whether AEP in faeces could be used to estimate dietary P intake in relation to the P requirement.

RESULTS:

The results showed that acid extractable P predicted P overfeeding. P fed in excess of requirements was largely excreted as acid extractable P. The unavailable and/or inevitably lost P fractions in the diets were smaller than assumed.

CONCLUSION:

This study demonstrates in experimental studies a positive relationship between measured AEP and indirectly calculated regulated P. Any P fed in excess of requirements was largely excreted as AEP. This fraction is thought to be the most mobile P fraction with regard to potential runoff losses. However, the unavailable and/or inevitably lost P fractions in the diets were smaller than assumed.

KEYWORDS:

dairy cows; diets; faecal excretion; phosphorus

PMID:
25913721
DOI:
10.1002/jsfa.7235
[Indexed for MEDLINE]

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