Optimum protein, amino acids (limiting amino acids) and energy for feeding male and female broiler chickens reared separately. 1. Protein and amino acids during the starter period

Petkova, G.; D"k Lung, B.

Zhivotnov"dni Nauki 20(2): 85-92


Accession: 001105651

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To 5 weeks old 4 groups each of male and female broiler chickens were given mixed feeds based on maize with metabolizable energy 3100 kcal/kg and crude protein 24.5, 23.0, 21.5 and 20.0, lysine 1.35, 1.25, 1.15 and 1.05 and methionine plus cystine 0.89, 0.85, 0.81 and 0.77%. To 2 weeks old gain was best for both sexes with diets containing 21.5% protein. At 5 weeks old liveweight was greatest and feed intake/kg gain least in males given diets with 24.5% protein and in females given diets with 21.5% protein. Intake of crude protein/kg gain increased with increasing protein and amino acids in the diet. Carcass meat tended to increase with increasing liveweight.