Effect of breed cross on the performance of fattening swine
系群间杂交对商品瘦肉猪育肥性能的影响
A new breed. A cross-pollination between tulips and daisies.
这是新品种,由郁金香和雏菊杂交而成.
The Chinese yellow breed is perhaps one of the earliest products of this cross.
中国黄牛可能是最早的这种杂交后代之一.
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