Abstract
Results of the investigation of the effect of the level of nondegradable protein in concentrate mixtures on digestibility of nutritive substances in fattening lambs are presented in this paper. Physiological research included 18 male lambs crosses Pirot Pramenka x W?rttemberg x Ile de France, average body mass of approx. 35,0 kg, divided into three groups. Lambs were fed iso-protein concentrate mixtures which differed in relation to share of protein non-degradable at the rumen level: 43% (I), 51% (II) and 58% (III). Trial results indicate that the level of protein adoption was not under the influence of investigated treatment, considering that digestibility coefficients were: 52,58% : 51,30% : 55,12%. With the increase of share of nondegradable protein in concentrate mixtures (43: 51: 58%), also tendency of increase of fat digestibility was observed: 76,13 : 77,98 : 87,17%, but decrease of degree of cellulose digestion: 67,40 : 45,87: 22,39% and NFE: 83,87 : 76,05 : 82,96%.
Highlights
Deficit of protein feeds on the market and high prices impose the need for their rational use in ruminant nutrition.It is known that food proteins which reach small intestines in ruminants represent sum of two protein fractions: microbial protein and non-degradableD
This is especially important in intensive fattening of lambs, considering that with the increase of genetic capacities of lambs their needs increase, especially relating to part of protein which non-degraded passes through rumen and together with microbial protein reaches duodenum (Ružić-Muslić, 2006)
Results presented in table 2 represent average digestibility coefficients of nutritive substances depending on the nutrition treatment
Summary
Deficit of protein feeds on the market and high prices impose the need for their rational use in ruminant nutrition.It is known that food proteins which reach small intestines in ruminants represent sum of two protein fractions: microbial protein and non-degradableD. Micro population in reticulum-rumen degrades protein from diet to peptides, amino acids and ammonia, afterwards these substances are used for synthesis of own proteins. In order to provide optimal pool of amino acids for certain production, it is necessary to provide in diet protein fraction which avoids degradation in reticule-rumen (non-degradable protein). This is especially important in intensive fattening of lambs, considering that with the increase of genetic capacities of lambs their needs increase, especially relating to part of protein which non-degraded passes through rumen and together with microbial protein reaches duodenum (Ružić-Muslić, 2006)
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