a-mating factor 合因子
a1-mating factor 粘合因子
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Ovulation rate is the principle factor limiting litter size in gilts and increasing the level of feed intake prior to mating will significantly increase ovulation rate.
排卵率是限制母猪窝重的主要因子，在配种前提高采食量能显著性地增加排卵效率。
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But one important factor is so-called disassortative mating.
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