The middle dietary energy maximize the ARE% and ARN% for 0- to 8- weeks periods. The ARE% and ARN% increased with the increase of the dietary energy for 9- to 16- weeks periods.

• 试验结果表明:在0一8周，中等能量水平的ARE%25和ARN%25最高，在8一16周，ARE%25和ARN%25随日粮能量水平的上升而上升;