育成期雄性蓝狐日粮适宜蛋白质水平

Studies on the Appropriate Protein Levels in the diet of Growing and Furring Male Blue Foxes

选用幼公蓝狐45只,随机分成5组,每组9只。育成前期各组蓝狐日粮蛋白质水平分别为26.36%、31.24%、36.33%、41.41%及46.165;冬毛生长期分别为28.73%、33.73%、40.00%,44.71%及50.26%。测定日粮不同粗蛋白质水平对育成期(包括育成前期和冬毛生长期)蓝狐生长性能、毛皮品质及经济效益的影响。结果表明,育成前期和冬毛生长期的粗蛋白质水平分别以31.24%和28.73%为最佳。从消化代谢试验来看,整个育成期蛋白质水平对其消化率无明显效应,而对能量、干物质消化率及N沉积率和N生物学效价有一定的影响。

Forty-five young male blue foxes were randomly assigned to 5 groups, 9for each. The feeding experiments were conducted in two periods——the growing andfurring periods. In the first period , the crude protein contents were 26.36%, 31.24%, 36.33%, 41.41% and 46.16% by dry matter, respectively, but in the furring period, with a crude protein content varying form 28.73% to 50.26%. The experimental results showed that the best protein level was 31.24% in the growing period and 28.73% in the furring one.The results of degestive and metabolic trails indicated that crude protein level do not af-fected the apparent protein digestibilities significantly thoughout the growing and furring periods, but affected the energy, dry matter digestibility, retention rate and biological value of ni-trogen significantly