冬春季节补饲精料对BMY牛育肥性能的影响

Finishing Effect of Concentrates Supplementary on BMY Cattle in Winter-spring Season

[目的]冬春枯草季节,为研究在不同饲养水平下对6-9月龄BMY公牛增重性能的影响。[方法]以6-9月龄BMY公牛为育肥对象,5种育肥方式分别为：对照组全放牧不设补饲;试验1组采用放牧＋补饲1.0 kg精料;试验2组采用全舍饲（粗饲料自由采食,补饲1.0 kg/d精料）;试验3组采用全舍饲（粗饲料自由采食,补饲2.0 kg/d精料）;试验4组采用全舍饲（粗饲料自由采食,补饲3.0 kg/d精料）。[结果]表明：6-9月龄BMY公牛在冬季全放牧条件下育肥,体重不会增加反而会减少,平均日增重（ADG）为-178 g;在冬季放牧＋补饲1.0 kg精料的情况下,ADG为395 g;在舍饲＋1.0 kg精料、舍饲＋2.0 kg精料和舍饲＋3.0 kg精料的情况下,ADG分别达600 g7、28 g和1,023 g,补饲效果差异极显著（P〈0.01）,表明BMY牛在舍饲条件下生长更快,可获得更高的ADG。随着补饲日粮营养水平的提高,随着BMY牛日粮干物质采食量增加,说明补饲精料有利于粗饲料的摄入,从而增加ADG。[结论]冬春枯草季节补饲精料,无论放牧还是舍饲,6-9月龄BMY公牛均有较好的ADG,以舍饲加补饲精料的增重效果最为明显,可获得理想的经济收益。

【Objective】The aim of the study was to compare the weight gain performances at five different nutrient levels of BMY bulls at the age between 6 and 9 months in winter spring with withered grass.【Method】5 groups were as following： The control group was grazed without supplementary.Treated group 1 was grazed and supplemented 1.0 kg/d concentrates.Treated group 2,3 and 4 were stabled with free intake roughage and supplemented 1.0 kg/d,2.0 kg/d and 3.0 kg/d concentrates,respectively.【Result】The result showed that the ADG of BMY bulls decreased 178 g/d at the age between 6 and 9 months in winter and spring with withered grass in the control group（under 24 hours grazing without supplementary）.The corresponding ADGs were 395 g,600 g,728 g and 1,023 g followed by treatment 1,2 and 3,respectively,which were significantly higher than that of the control group（P〈0.01）.The results indicated that BMY cattle grow faster and perform higher ADGs in the stabling conditions.As the supplemented concentrate increased,more dry matter was taken by BMY cattle in the daily diet,which suggested that supplemented concentrates was in favor of improving the intake of the roughage,which,in return,improved ADGs.【Conclusion】 It was clear that,in winter spring with withered grass,BMY bulls at the age of 6～9 months performed better ADGs treated by concentrates supplementary both under the grazing and stabling conditions.Stabling with concentrates supplementary,BMY bulls also performed significant ADGs and ideal economic benefits could be gained.