本试验旨在研究饲粮维生素D₃添加量对扬州鹅生长性能、屠宰性能和血清生化指标的影响,进而探讨5～10周龄扬州鹅饲粮维生素D₃的适宜添加量。选取300只健康、体重均匀的5周龄扬州鹅公鹅,随机分成5个处理,每个处理6个重复,每个重复10只鹅。对照组饲喂基础饲粮,试验组分别饲喂在基础饲粮中添加500、1 000、2 000和4 000 IU/kg维生素D₃的试验饲粮。试验期6周。结果表明:1)与对照组相比,饲粮添加1 000 IU/kg的维生素D₃极显著提高了10周龄扬州鹅的平均体重(P<0.01),显著提高了5～10周龄扬州鹅平均日增重和平均日采食量(P<0.05),饲粮添加维生素D₃显著降低了5～10周龄扬州鹅的料重比(P<0.05),并且在维生素D₃添加量为2 000 IU/kg时极显著低于对照组(P<0.01)。2)饲粮添加1 000 IU/kg维生素D₃显著提高了10周龄扬州鹅的全净膛率(P<0.05),显著降低了腹脂率(P<0.05);饲粮添加维生素D₃对10周龄扬州鹅的屠宰率、半净膛率、胸肌率、腿肌率、心脏指数、肝脏指数和肌胃指数的影响均不显著(P>0.05)。3)饲粮添加维生素D₃显著(P<0.05)或极显著(P<0.01)提高了10周龄扬州鹅的血清钙含量,维生素D₃添加量为2 000 IU/kg时最高,极显著高于对照组(P<0.01),显著高于500 IU/kg组(P<0.05),1 000 IU/kg组显著高于对照组(P<0.05);饲粮添加维生素D₃对10周龄扬州鹅的血清磷含量和碱性磷酸酶活性的影响均不显著(P>0.05)。综上所述,本试验推荐5～10周龄扬州鹅饲粮维生素D₃适宜添加量为1 000～2000 IU/kg。

The objective of this study was to investigate the effects of dietary vitamin D₃ supplemental level, on growth performance, slaughter performance and serum biochemical indexes of Yangzhou geese, and to explore the dietary optimal vitamin D₃ level for Yangzhou geese at the age of 5 to 10 weeks. A total of 300 5-week-old healthy male Yangzhou geese with similar body weight were randomly allocated into 5 groups with 6 replicates per treatment and 10 geese per replicate. The control group was fed a basal diet and experimental groups were fed the basal diets supplemented with 500, 1 000, 2 000 and 4 000 IU/kg vitamin D₃, respectively. The experiment lasted for 6 weeks. The results showed as follows: 1) compared with the control group, adding 1 000 IU/kg vitamin D₃ significantly increased the body weight of Yangzhou geese at the age of 10 weeks (P<0.01), and significantly increased the average daily gain and average daily feed intake of Yangzhou geese at the age of 5 to 10 weeks (P<0.05). Adding vitamin D₃ significantly decreased the feed/gain of Yangzhou geese at the age of 5 to 10 weeks (P<0.05), and feed/gain of 2 000 IU/kg vitamin D₃ group was significantly lower than that of control group (P<0.01). 2) Adding 1 000 IU/kg vitamin D₃ significantly increased the percentage of eviscerated yield of Yangzhou geese at the age of 10 weeks (P<0.05), and significantly decreased the percentage of abdominal fat (P<0.05). However, there were no significant differences in dressing percentage, half-eviscerated yield percentage, breast muscle percentage, leg muscle percentage, cardiac index, liver index and gizzard index of Yangzhou geese at the age of 10 weeks among all groups (P>0.05). 3) Adding vitamin D₃ significantly (P<0.05) or extremely significantly (P<0.01) increased serum calcium content of Yangzhou geese at the age of 10 weeks (P<0.05), when adding 2 000 IU/kg vitamin D₃, the serum calcium content was extremely significantly higher than that of control group (P<0.01), and significantly higher than that of 500 IU/kg group (P<0.05), the serum calcium content of 1 000 IU/kg vitamin D₃ group was significantly higher than that of control group (P<0.05). There were no significant differences in serum phosphorus content and alkaline phosphatase activity of Yangzhou geese at the age of 10 weeks among all groups (P>0.05). The results indicate that the optimal level of vitamin D₃ is 1 000～2 000 IU/kg for male Yangzhou geese at the age of 5 to 10 weeks.