crossbreeding and improvement
...肉牛杂交育肥试验报告 关键词 ：杂交改良；生长发育；育肥性能；皮埃蒙特 [gap=1074]Key words : crossbreeding and improvement; growth and development; finishing performance; Piedmontese; ..
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crossbreeding and improvement
杂交改良
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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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