脱脂大豆の栄養価に関する研究-5-生脱脂大豆の日令を異にする雛への影響
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概要
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Influences of raw soybean meal on the utilization of heated meal were studied in three separate experiments using chicks of different ages. Soybean meal component of the diet was varied from all raw meal to all heated meal in ratios of 0/4, 1/3, 2/2, 3/1, 4/0.In one experiment, experimental diets were fed to 8 day old chicks for three weeks. In the other experiment, the experimental diets were fed to 40 day old chicks for a period of three weeks.In the last experiment, the experimental diets were fed to 80 day old chicks for a period of three weeks. Criteria used were growth, feed efficiency, pancreas weights, metabolizable energy value and protein digestibility. Growth inhibition, pancreatic hypertrophy and reduced feed efficiency resulted when the diet replacing the heated meal with raw meal were fed to 8, 40 and 80 day old chicks.The response to level of raw soybean meal in the diet was essentially linear. The metabolizable energy and digestibility of protein showed a step-wise decreased as the raw meal content of the diet increased. These results indicated that the susceptibility of the chicks to the detrimental effects of raw soybean meal did not decrease with age.The metabolizable energy values for both heated and raw meal were determined. The metabolizable energy values for the combination of heated and raw meal were close to the expected value based on their respective yields of heated and raw meal. The digestibility of protein for both heated and raw meal was determined, and the expected values for combina- tion ofheated and raw meal was calculated from their respective yields of them.Protein digestility coefficients were close to their expected values in baby chicks fed from 8 to 28 days of age. This results suggested that in baby chicks the digestion of the heated meals was not affected by the supplementation of raw meal, and the digestion of the heated and raw meal was independent each other. However, in 40 and 80 day old chicks fed for three weeks, protein digestibility coefficient were lower than their expected values. This results suggested that in older birds the digestion of the heated meal was affected by the supplementation of raw meal. The chick growth retardation by raw soybean meal can be explained by the unavailability of protein and lowered metabolizable energy value.
- 公益社団法人 日本畜産学会の論文