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 .