Study on three - way cross model of beef cattle and measurement of calf performance 肉牛三元杂交模式研究与犊牛性能测定
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These usually docile and good - natured central asian cattle , who carry fierce - looking horns , play a vital role in the himalayan economy 这些中亚牛性情温顺，头上长着可怕的犄角，在喜玛拉雅地区的经济中起着重要作用。
