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、改进的同期牛平均值
分为两种： ①MCI,每一头女儿的同期牛第一泌乳期产奶量的校正平均值；②MCL,同期牛第二泌乳期以后各胎次产奶量的校正平均值。用来计算 PD 值
anim.husb.
modified contemporary average
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