Marginal profits for all objective traits but litter size born alive in dam line of dam breed are 1/2 smaller than those in sire line of dam breed.
父本父系目标性状不包括窝活产仔数，母本母系目标性状的边际效益除窝活产仔数外的所有性状都比母本父系小1/2。
Marginal profits for all objective traits but litter size born alive in dam line of dam breed are 1/2 smaller than those in sire line of dam breed.
父本父系目标性状不包括窝活产仔数，母本母系目标性状的边际效益除窝活产仔数外的所有性状都比母本父系小1/2。
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