分化选择一般分为父系(sire line)和母系(dam line).在长期育种和生产实践中发现,要求一个品种具有产仔多,生长快,耗料少,肉质好,生活强等优点是不切实际的.
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specialized sire line 专门化父系
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。
In fact, this was the color of the line founding stallion Fakirpelvan (shown here) sire of the famous European jumper Penteli.
事实上，这是该行成立骘fakirpelvan(如图所示)父系的欧洲著名跳线Penteli的颜色。
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