经过育肥，养鸡场的鸡生长得很迅速。
After being fattened, the chickens on the chicken farm are growing rapidly.
从第四世代起执行这个选择方案，经过第四、第五、第六世代三个世代的选择，使90公斤左右育肥猪的瘦肉率从55.46%提高到56.71%。
Percentage of lean meat of finishers with the weight of 90 kg or so raises from 55.46 to 56.71% through selection for the fourth fifth and sixth generation.
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