ひなにおけるエネルギー代謝に及ぼすリジン欠乏の影響について

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The effects of graded levels of lysine deficiency on energy utilization were studied. The lysine deficient semipurified basal diet were uesd in this experiment. The sources of protein used in the diet were mixture of sesame meal and safflower meal. It contained 19.4 percent of protein and 294kcal of metabolizable energy per 100gm (air dry basis). The value for the lysine content of the diet was calculated from the results of microbiological assay of safflower and sesame meal. The basal diet was estimated to contain 0.56 percent of lysine. Male White Leghorn×Barred Plymouth Rock chicks were kept in electrically heated, thermostatically controlled battery brooders with raised wire floors. Experimental period was from 7 to 21 days of age. Experiments were initiated to obtain the evidence on the lysine requirement. The results of this investigation showed that the lysine requirement of chicks was 1.03 percent of the diet, in agreement with the results of the earlier works. In a second experiment, the effects of lysine deficiency on energetic efficiency were studied. It is as yet uncertain whether metabolizable enzrgy is an adequate measure of the metabolically useful majar components of adiet for chicks.This basic question has been studied with growing chicks by determining the quantitative relationships between metabolizable energy intake and tissue gains, for lysine deficient diets.The bird's ability to store the metabolizable energy of the diet was observed based on determinations of metabolizable energy, caloric value of the carcasses and heat production. It was found that severe lysine deficiency had no effect on the nitrogen corrected metabolizable energy content of the diet per unit weight. As the lysine level in the diet increased, the absolute gains of both protein and fat increased, and protein gain increased to a greater extent. Quite severe lysine deficiency produced lowered efficiency of conversion of dietary metabolizable energy to tissue energy gains. Marginal deficiency in lysine retarded growth, but did not affect the efficiency of energy metabolism as compared with the adequate diet. Chicks fed marginal lysine deficient diet, however, had greater gains in tissue fat but lower gains of protein. Marginal lysine deficiency caused less energy to be stored as protein, and this was compensated for by the increased retention of energy as fat.
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ひなにおけるエネルギー代謝に及ぼすリジン欠乏の影響について

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