Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 345272
Title Proposal for the assessments of phosphorus requirements of dairy cows
Author(s) Valk, H.; Beynen, A.C.
Source Livestock Production Science 79 (2003)2-3. - ISSN 0301-6226 - p. 267 - 272.
Department(s) ID - Voeding
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) dry-matter intake
Abstract One measure to contribute to reducing environmental pollution with phosphorus (P) is to decrease P intake of dairy cows and thus decreasing P excretion with faeces. The current P recommendations are mainly based on data obtained with sheep and goats. We have attempted to the factorial method, i.e., using the net P requirement for maintenance and milk production and the true absorption coefficient. However, inevitable fecal P losses and the true absorption of P are not known for cows. Thus, we have calculated the inevitable P losses, and the true absorption coefficient using data on saliva production, saliva-P content and the efficiency of P re-absorption. The data were either directly or indirectly derived from literature values and experimental results. We propose the following P requirement for dairy cows: P requirement (g/day/600-kg cow)=19+1.43×kg milk. The present recommendation is up to 22% lower than the current recommendations for high-yielding dairy cows used in the UK (AFRC, 1991)
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