Abstract
One-year-old colostomised laying hens of the fattening species received 120 g of a basic ration approximately meeting their requirements (control group) and the animals of the test group 10, 20, 30 resp. 40 g wheat straw meal in addition. Straw meal admixtures of up to 30 g had no drastic influence on the apparent digestibility of amino acids. 40 g straw meal in the ration increased the excretion of the essential amino acids by 19% and of the non-essential ones (particularly glycine, zystine and serine) by 39% in comparison with the basic ration. The amount of free amino acids and of peptide in feces was significantly lower when the ration contained 20 g straw meal. On an average of the five variants checked, the amount of amino acid nitrogen soluble in TCA in the total-N in feces was 12%. Due to the partial digestion of the amino acids of the straw meal and the favourable influence of 10...20% straw meal in the ration on absorption, 2...3% additional nitrogen in the form of essential and non-essential amino acids was available to the hens in this range of admixture according to the analysis of feces.
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