Meeting the energy and protein requirements of the high producing sow

There is little doubt that the nutrient requirements of the lactating sow require further investigation. Levels of productivity are increasing well beyond those employed in earlier empirical studies; consequently, the need for more precise factorial calculations becomes increasingly apparent. t be recognized that factorial estimates of nutrient requirements are not yet sophisticated enough to describe optimum feeding programs, those strategies that define the method of feeding during gestation and during lactation, or phases within each, to maximize overall productivity or efficiency. For example, there is now considerable activity devoted to the feeding of gilts and sows to achieve a desired body composition, much as is done in broiler breeders. y, the relationship among productivity, nutrition and endocrine status is an emerging and exciting new development. Because hormone status plays such an obvious role in reproduction, new information in this area can only benefit the efficient management of the breeding herd.