Effect of Dietary Isoleucine Level and Food Intake on Energy Utilization by Growing Male Chicks.

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Two experiments involving comparative slaughter procedures were conducted to see if the decrease in total energy retention (ER) resulted from the decreased food intake in growing chicks fed on a diet containing isoleucine less than its requirement. Ad libitum feeding a diet containing 3.0g of isoleucine/kg (50% deficiency) decreased food intake, body weight gain, apparent metabolizable energy (AME) intake, ER, and ratio of ER/AME intake. When both the control diet and the diet containing 3.0g isoleucine/kg were tube-fed at the high and low levels of food intake (218.5 and 74.8g/chick/14 days, respectively), body weight gain significantly lower in chicks on the low-isoleucine diet than in the control chicks at each level of intake. Energy retained as protein was significantly decreased by the low-isoleucine diet and reducing food intake. Energy retained as fat was affected by food intake but not by dietary isoleucine level. Energy retention was unaffected by dietary isoleucine level and depended on AME intake alone. No main effect of dietary isoleucine level on the ratio of ER/AME intake or heat increment by feeding was observed but significant interactions between isoleucine and food intake effects were detected in both the criteria. These results indicate that the decreased ER in chicks fed on the low-isoleucine diet was due mainly to the decreased food intake and not to the decreased efficiency of AME utilization.
日本家禽学会の論文