全株青贮玉米对西门塔尔杂交牛生产性能、表观消化率及血液生化指标的影响

选择体重350 kg左右健康的西门塔尔杂交公牛45头随机分为3组,分别饲喂3种不同日粮,其中试验Ⅰ组(精料+玉米秸秆黄贮)、试验Ⅱ组(精料+全株青贮玉米)和试验Ⅲ组(精料+添加剂全株青贮玉米),试验期140 d。结果表明,试验Ⅲ组的日增重极显著地高于试验Ⅰ组(P<0.01)和试验Ⅱ组(P<0.01),分别比试验Ⅰ组、试验Ⅱ组高出90.35%、24.00%。试验Ⅰ组干物质采食量极显著高于试验Ⅱ组(P<0.01)和Ⅲ组(P<0.01),试验Ⅱ组和试验Ⅲ组的干物质采食量无显著差异。试验Ⅲ组和试验Ⅱ组料重比极显著低于Ⅰ组(P<0.01)。试验Ⅲ组和试验Ⅱ组的粗蛋白的表观消化率显著高于试验Ⅰ组(P<0.05),试验Ⅲ组粗蛋白表观消化率极显著高于试验Ⅰ组(P<0.01);中性洗涤纤维和酸性洗涤纤维的表观消化率Ⅲ组显著高于试验Ⅰ组(P<0.05)。肉牛血清中游离脂肪酸、瘦素的含量试验Ⅰ组显著高于Ⅱ组和Ⅲ组(P<0.05)。肉牛血清中胰岛素样生长因子Ⅰ浓度试验Ⅱ组、试验Ⅲ组显著高于Ⅰ组(P<0.05),试验Ⅱ组与试验Ⅲ组差异显著(P<0.05)。试验Ⅲ组的头均日收益比试验Ⅰ组、试验Ⅱ组分别高22.21和9.27元。综上所述,添加剂全株青贮玉米的育肥效果和经济效益最好。

Effects of whole-plant corn silage on performance,digestibility and blood biochemical parameters in Simmental crossbred bulls

In this experiment, 45 healthy Simmental hybrid bulls weighing approximately 350 kg were randomly divided into three treatment groups that were fed different diets for a period of 140 d: GroupⅠ(concentrate +corn straw storage), Group Ⅱ (concentrate+whole-plant corn silage) and Group Ⅲ (concentrate+whole-plant corn silage+lactic acid bacteria compound preparation). The results showed that Group Ⅲ’s average daily gain was significantly higher than both Groups Ⅰ and Ⅱ (P<0.01). The daily gain of Group Ⅲ was 90.35% and 24.00% higher than Groups Ⅰ and Ⅱ respectively. The dry matter intake of Group Ⅰ was significantly higher than Groups Ⅱ and Ⅲ (P<0.01), while there were no significant differences between Groups Ⅱ and Ⅲ. The feed:gain ratio of Groups Ⅱ and Ⅲ were significantly lower than Group Ⅰ (P<0.01). The digestibility of crude protein (Measurement using the FOSS Automated Protein Analyzer (USA)1])for Groups Ⅱ and Ⅲ was higher than Group Ⅰ (P<0.05), and especially so in the case of Group Ⅲ (P<0.01). The apparent digestibility of neutral detergent fiber and acid detergent fiber in Group Ⅲ were significantly higher than Group Ⅰ (P<0.05). The content of free fatty acids and leptin in Group Ⅰ were significantly higher than Groups Ⅱ and Ⅲ (P<0.05).The levels of bovine insulin-like growth factor in Groups Ⅱ and Ⅲ were significantly higher than Group Ⅰ(P<0.05) and there was also a significant difference between Groups Ⅱ and Ⅲ (P<0.05). The average daily benefit of Group Ⅲ was 22.21 yuan and 9.27 yuan higher than that of Groups Ⅰ and Ⅱ respectively. In conclusion, this experiment showed that, in terms of fattening effects and economic benefits, cattle diets with additive whole corn silage outperformed the other two treatments studied.