The milk and growth performance of low production Holstein herd had been improved after crossbreeding for 17 years and the rotational mating patterns made better improvement.
经过杂交，原中低产荷斯坦牛群体在产奶性能、生长性能方面都有进展，轮回杂交提高幅度相对略高。
The milk and growth performance of low production Holstein herd had been improved after crossbreeding for 17 years and the rotational mating patterns made better improvement.
经过杂交，原中低产荷斯坦牛群体在产奶性能、生长性能方面都有进展，轮回杂交提高幅度相对略高。
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