以下为句子列表：
英文: However , modern sows, with a leaner genotype and the superior reproductive performance we have come to expect, must be managed differently from their counterparts of 20 years ago, since they begin their reproductive life with fewer body reserves.
中文: 然而，我们现在所期盼的瘦肉型高繁殖性能的母猪，必须要与20年前的养殖管理有所区别，因为它们要用更少的体储备来实现高繁殖性能。
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英文: What is needed is an integrated feeding strategy, starting with the developmental period of the gilt, and continuing throughout each successive gestation and lactation period, which is designed to maintain productivity and prolong the reproductive life of
中文: 关联的饲喂策略，由后备母猪开始，然后包括持续的妊娠和泌乳，从延长母猪的种用期和维持好的繁殖性能入手。
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