According to best litter size, from parity 1 to 3, the optimal total pregnant gain is 39kg, N intake 34.8g/d, N retention 18.6g/d, ADE intake 21.5MJ/d.是什么意思_According to best litter size, from parity 1 to 3, the optimal total pregnant gain is 39kg, N intake 34.8g/d, N retention 18.6g/d, ADE intake 21.5MJ/d.在线翻译_英语_读音_用法_例句