If N excretion is considered as maintenance requirement of weaned sika deer when they are fed protein free diet, the maintenance requirement of deer at this stage will be 4.808 g N or (4.808x6.25) g crude protein.

• 此回归关系式说明，在日粮蛋白质水平为0时，氮平衡为-4.；808g/d，如果把无蛋白食入时氮的排出量视为仔鹿的氮维持需要，那么断乳仔鹿每天的氮维持需要为4