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병아리에 있어서 필수아미노산 급여수준을 달리할 때 Urea 이용성 시험
이영철,우춘전 ( Young C . Rhee,Chun J . Woo ) 한국축산학회 1975 한국축산학회지 Vol.17 No.4
The experiment was carried out to determine the effects on chick growth, feed efficiency, body composition and plasma free amino acid concentration when chicks were fed various level of essential amino acids. The results obtained were summarized as follows; 1. Urea can be utilized in the chick when the diet containing all the essential amino acids, but when the diets containing limiting amounts of various amino acid were fed to male chick, growth rate and feed consumption decreased gradually. Especially, deficiencies of arginine, isoleucine, phenylalanine+tyrosine or tryptophan impaired growth more badly than that of methionine+cystine, lysine, leucine, histidine, valine or threonine. 2. Percentage body fat was increased and percentage body protein decreased when comparing to control fed reference standard diet, all or one of dietary amino acid was unbalanced. 3. Nitrogen retention, nitrogen efficiency and protein efficiency ratio generally decreased significantly in the treatments fed imbalanced amino acid diet and those treatments showed decreasing growth rate. 4. The composition of free amino acid of plasma proved to be sensitive indicator of dietary amino acid balance. When the experimental diet contained at least one limiting essential amino acid such as methionine+cystine, lysine, arginiae, tryptophan, isoleucine or phenylalanine+tyrosine, the concentration of that limited essential amino acid in the plasma was decreased significantly although the other plasma amino acid showed the trend generally increasing as the result of impaired rate of protein synthesis by the given unbalanced amino acid.
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