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Účinnost nízkoproteinových krmných směsí s doplňkem limitujících aminokyselin u brojlerů
Kupčíková, Lucie
The aim of the study was to evaluate the effect of four crude protein (CP) levels supplemented with limiting amino acids in the broiler diets on broilers growth, feed conversion ratio (FCR) and carcass quality. Hybrid ROSS 308, 2640 chickens, were divided into four groups and they fed grower diets with 22; 20,8; 19,5 and 18% of crude protein. The experiment period lasted from 10 to 30 days of age. Starter and finisher diets were the same for all groups. Grower diets were optimized in digestible limiting amino acids (lysine, methionine, leucine, izoleucine, threonine, tryptofan a valine). The lowest growth intensity was observed in the broilers fed 18% CP (P<0.05) on the other side the highest weight was found in the group fed 19,5% CP (P<0.05). The best FCR was found at feeding 19,5% CP and the worst at feeding 18% CP (P<0.05). The carcass yield and breast yield was the highest in group fed 19,5% CP (P<0.05). The highest proportion of abdominal fat was found in group fed 18% CP (P<0.05). On the basis of the results we can recommend the level 19,5% crude protein in grower diets supplemented by limiting amino acids without negative effect on FCR and broiler growth.
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