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中文摘要：
两个月的试验结果表明，补饲精料对减少牦牛冷季掉膘有明显作用。8月龄牦牛补饲精料试验组比对照组少减重2．81kg，两者之间存在极显著差异（P〈0.01）。20月龄补饲精料牦牛试验组比对照组少重2．19kg，两者之间存在极显著差异（P〈0．01）。通过计算投产比得出，补饲精料是增加三江源区牦牛冷季营养供给，减少掉膘，提高生产效率的有效途径。
英文摘要：
The experimental studying showed in two months that supplement concentrate can play great role in decreasing fat of yak in cold season. Yaks aged 8 months as experimental groups, comparing with control group, it is 2.81 kg less than control group in decreasing body weight, There is very significant difference between them （P 〈 0.01 ）. it is 2.19kg less in decreasing body weight for yaks aged 20 months than those of control group. There is very significant difference between them （P 〈 0.01 ）. By calculating ratio of input and output, the supplement concentrate is effective way in providing nutrition, decreasing fat of yaks in cold season in three rivers region
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