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 525610
Title The biological value of proteins in mixed grass hays
Author(s) El-Samman, S.
Source University. Promotor(en): E. Brouwer. - Wageningen : Veenman - 84
Publication type Dissertation, internally prepared
Publication year 1961
Keyword(s) voer - samenstelling - eiwitten - voedergrassen - feeds - composition - proteins - fodder grasses
Categories Chemical Composition, Nutritive Value
Abstract Biological values of protein in grasshays cut in two years and at different times of the year were estimated in 9 trials with groups of 2 to 4 male Texel lambs, by different methods: 1) the method of Thomas and Mitchell: a) assuming a value of 3.438 for metabolic faecal protein or b) using values estimated by pepsin-HCI digestion of the faeces; 2) different modifications of the nitrogen balance index method.

Protein-poor and moderate-protein diets were used with, respectively, 3.2-7.6 and 7.3-10.3 % crude protein in dry matter. The average biological value of all hays in the low-protein diets was 89.3 and 89.9 and in the moderate-protein rations 77.8 and 75.7 (methods 1a and 1b resp.). Method 2 gave lower values, between 44.4 and 90.6. Biological value of protein in autumn hays was lower than in spring hays. Differences in composition of protein and non-protein N and heating in the stack may be partly responsible.

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