| Different doses of enzyme preparations (compound enzyme and phytase preparations) and probiotics preparations were appended into diets of Alopex lagopus respectively in different growing phases. Based on feeding experiment, digestion metabolism experiment and slaughtering experiment, their effects on digestion metabolism, immunological function and performance trait were discussed in detail from the point view of nutriology, immunology and cytology. Experimental method and results were presented as follows:(1) Compound enzyme: Seventy-two healthy young foxes were chosen and divided into six groups randomly whose years old (45 + 1) and weights (p>0.05) were close and female to male were fifty-fifty. One group was control group (fed with basic diets) and other five groups were experimental groups (appended different doses of compound enzyme preparations into basic diets), experimental period was 60 (growth phase) and 50 (hair-growth phase) days respectively. After appended with compound enzyme preparations, digestibility of nutrient component increase at different degrees in each group. In growth phase, contrasted with control group, digestibility of crude fat increases 8.89% (p<0.01) in group II, digestibility and metabolic rates of crude protein increase 13.05% (p<0.01) and 13.28% (p<0.05) respectively in group III which are the highest among six groups. Maximal average daily gain (p<0.05) and minimal ratio of daily gain to daily feed (p<0.05) are also in group III. In chimonophilous phase, among all groups maximal average daily gain (p<0.05) and minimal ratio of daily gain to daily feed are in group II. Maximal digestibility and metabolic rates of crude protein are in group II which increase 10.43% (p<0.05) and 10.09% (p<0.05) respectively contrasted with control group, digestibility of crude fat in group III increases 6.67% (p<0.05) which is the highest among all groups.Results show: Compound enzyme can improve digestive rates of nutrient component effectively, such as crude fat and crude protein, but effects on digestion and absorption of crude fibre are unconspicuous (p>0.05). It can enhance digestibility of essential and total amino acid but has no effects on absorption of lysine and arginine, can increase utilization rate of Ca, P, Feobviously but has little influence on Cu and Zn. It can improve immunological function, increase viability and hide quality ofAlopex lagopus, reduce attack rate but its effect on development of visceral organs is unconspicuous (p>0.05).Effects of compound enzyme additives on digestion metabolism, immunological function and performance trait correlate with their doses. Analysis from the point view of economical benefit, feasible dose of compound enzyme additives is 0.6% in growth phase and 0.4% in chimonophilous phase.(2) Phytase: Sixty healthy young foxes were chosen and divided into five groups randomly whose years old (45 + 1) and weight (p>0.05) were close and female to male were fifty-fifty. One group was control group (fed with basic diets) and other four groups were experimental groups (appended different doses of phytase preparations into basic diets), experimental period was 50 (growth phase) and 50 (hair-growth phase) days respectively. Effects of different dose of phytase preparations on digestibility of nutrient component and mineral elements are different during growing phase. In growth phase, digestibility and metabolic rates of crude protein, utilization rate of Ca and P of group IV reach the highest among all groups. Contrasted with control group, digestibility and metabolic rates of crude protein increase 6.85% (p<0.01) and 5.61% (p<0.05), utilization rates of Ca and P increase 8.97% (p<0.01) and 8.25% (p<0.01) respectively in group IV. In chimonophilous phase, digestibility of crude protein, utilization rate of Ca and P of group IV reach the highest among all groups. Contrasted with control group, digestibility of crude protein increases 7.89%, utilization rates of Ca and P increase 11.32% (p<0.01) and 12.87% (p<0.01) respectively in group IV...
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