以下为句子列表：
英文: Crossbred Duroc was not better than pure ones for litter size at birth.
中文: 系间杂交公猪所配母猪的产仔数也与纯系所配母猪的产仔数相近。
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英文: However, for litter size and litter weight at the age of 20d, crossbred Duroc mated groups appeared superior to pure ones.
中文: 但在20日龄窝仔数和窝重性状上，杂种公猪优于纯种公猪。
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