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 342253
Title Effects of varying monosodium phosphate intake on phosphorus excretion in dairy cows
Author(s) Ekelund, A.; Sporndly, R.; Valk, H.; Murphy, M.
Source Livestock Production Science 96 (2005)2-3. - ISSN 0301-6226 - p. 301 - 306.
Department(s) ID - Voeding
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) dietary phosphorus - lactating cows - performance - protein - rations - calcium
Abstract Phosphorus excretion in faeces was measured by total collection using dairy cows fed five amounts of P in a 5 × 5 Latin square design with three week periods. Milk production was 23 ± 4 kg per day at the onset of the trial (DIM 185 ± 11). Different quantities of monosodium phosphate (MSP) were added to a basal diet to obtain daily P intake levels of 44, 67, 92, 117 and 142 g (2.4, 3.7, 5.1, 6.4 and 7.8 g P kg¿ 1of DM, respectively). Faecal P excretion increased linearly (r2 = 0.97) as dietary P intake increased and the apparent digestibility of P was calculated to be 0.37, 0.28, 0.22, 0.21 and 0.22, respectively. The relatively low apparent digestibility is explained by excess P intake in relation to the requirements. The concentration of P in faeces ranged from 4 to 23 g kg¿ 1 of DM corresponding to the lowest and highest level of P intake, respectively. Variation of P in faecal output was substantial among days, though total DM and P intake was constant throughout the collection periods. Results indicate a requirement for sampling over at least 5 consecutive days, even when using total faecal collection
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