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.

• 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。