| Development and utilization of agricultural by-products are the important way for the sutainable animal husbandry development in the world at present and in future. china is a large country in the fruit industry and apple is one of the main production. Hence, development of apple by products is of important meaning for china's sutainable animal husbandry development. However, there are less of systematical research report being found about the feeding value of apple by-products upto now.In order to evaluate the feeding value of branches and leaves of apple tree as feeds, 4 experiments were carried out in this study, including: digestibility of the leaf powder of apple trees in rex rabbits, rumen degradation characteristics of leaves and branches of apple tree in Guanzhong dairy goat, effect of different proportional leaf powder of apple tree in diet on growth of rex rabbits, Influence of apple leaves on milk performance and biochemical parameters in Guangzhong dairy goat.1. Digestibility of the leaf powder of apple trees in rex rabbitsIn experiment No.1,12 of 70 day- old health rex rabbits with similar body weight were selected to study the apparent digestibility of dry matter, crude protein, crude fat, crude fiber, crude ash in leaves of apple tree.The result showed that the apparent digestibility of dry matter, crude protein, crude fat, crude fiber, crude ash in leaves of apple tree were 40.60%,67.79%,60.37%,36.05%,7.94%.2. Effect of different proportional leaf powder of apple tree in diet on growth of rex rabbits24 of 70 day-old health rex rabbits with similar body weight were selected and divided into three treatment groups according to the matching principle to evaluate feeding value of leaves of apple tree. Treatment group 1, 2, 3 were added 0%, 10%, 20% leaf powder of apple respectively. The result showed that: The average daily gain of treatment group 2, 3 was higher than treatment group 1(P>0.05),the ratio of intake and weight is better than treatment group 1 (P>0.05); average daily feed intake of treatment group 2 was higher than treatment group 1 and 3(P<0.05); Determination of blood and serum were not significantly different between treatment group 2, 3 and 1(P>0.05); Treatment group 2, 3 compared with treatment group 1, dressing percentage, Semi-eviscerated percentage and eviscerated percentage have not significant difference(P>0.05),but treatment group 2 was higher than treatment group 3 significantly(P<0.05); 10%, 20% leaf powder of apple tree were added to diets had no effect on the rex rabbits'internal organs(P>0.05); 10%, 20% leaf powder of apple tree were added to diets had no effect on the quality of rex rabbits'fur.3. Rumen degradation characteristics of leaves and branches of apple tree in Guanzhong dairy goatThree goats with averaging 45kg in body weight and a permanent rumen fistula respectively were selected to study the degradation rate of dry matter, crude protein and neutral detergent fiber in leaves and branches of apple tree by rumen nylon bag, at the same time, the composition of nutrients was determined in leaves and branchs of apple tree in summer and autumn and defoliation in winter.The result showed that: the content of crude protein in leaves was higher than the content in branches, leaves in autumn and defoliation in winter were significantly higher than branches in summer and autumn(P<0.05),and were also significantly higher than leaves in summer (P<0.05). The content of crude fat in leaves was significantly higher than th content in the branches (P<0.05). The content of crude fiber in branches was significantly higher than the content in leaves (P<0.05), but the content of crude fiber in leaves in autumn and defoliation in winter was significantly higher than the content in leaves in summer(P<0.05).The content of crude ash in leaves was significantly higher than the content in branches(P<0.05), but the content of crude ash in defoliation in winter was significantly higher than the content in leaves in summer and autumn (P<0.05); The effective degradability of dry matter in leaves of apple tree was significantly higher than the one in branchs(P<0.05), but the leaves in the summer and autumn was significantly higher than defoliation in winter(P<0.05).The effective degradability of protein in leaves was significantly higher than the one in branch (P<0.05), but the leaves in different seasons were not obvious difference (P>0.05). The effective degradability of neutral fiber in leaves in autumn were significantly lower than leaves in summer and defoliation in winter(P<0.05), When the outflow rate of chyme in rumen was 0.02 and 0.03, the degradability of neutral fiber in leaves was higher than brannch(P<0.05), When the outflow rate of chyme in rumen was 0.04 and 0.05,the degradability of branches in autumn was significantly lower than leaves (P<0.05), the degradability of neutral fiber in branches in summer is significantly lower than the leaves in summer and defoliation in winter (P<0.05).4. Influence of leaves of apple tree on milk performance and biochemical parameters in Guangzhong dairy goat.In order to evaluate the effects of leaves of apple tree on milk performance and health status of Guanzhong dairy goats in the experiment, 28 lactating Guanzhong dairy goats were divided into 4 groups according to body weight, milk yield, parity and date of lambing by matching experimental principle. 0%,30%, 50% and 70% apple leaves were added into 4 treatment groups respectively to substitute for alfalfa hay. The results showed that the 30% and 50% treatment groups of leaves of apple tree can increase significantly (P<0.05), the additon of 30%, 50%, 70% leaves of apple tree had no bad influence for milk composition and biochemical parameters.
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