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Effect of Source of Dietary Energy and Energy Restriction during Lactation on Sow and Litter Performance^1,2,

University of Nebraska^,6, Lincoln 68583-0908

Abstract

The effects of source of energy and energy restriction during lactation on sow and litter performance were investigated in an experiment with 90 primiparous sows. At parturition, the sows were randomly assigned to diets containing either tallow or cornstarch as a major energy source. Energy intake was restricted to 8 Meal of metabolizable energy· sow^–1·d^–1 during a 28-d lactation. All sows received equal amounts of crude protein, vitamins and minerals daily, which met or exceeded standard recommendations. Sows fed the diet with tallow lost more weight (P<.05) during lactation than those fed the diet with cornstarch. Litter size at d 28 was greater (P<.07) for sows fed cornstarch than for sows fed tallow. However, pig and litter weights on d 14 and 28 of lactation were similar between dietary treatments. Sows were bled on d 110 of gestation and d 14 and 28 of lactation and blood plasma was analyzed for urea. A significant treatment x time interaction was found for plasma urea. Sows fed the diet with tallow appeared to catabolize more protein than those fed the diet with cornstarch. Energy digestibility was lower (P<.01) in the diet containing tallow, but protein digestibility was not affected by source of energy. Percentages of sows in estrus by 7, 14 and 70 d post-weaning were not different between treatments.

¹ Published as Paper No. 7421, Journal Series, Nebraska Agr. Exp. Sta. Research reported was conducted under Project 13-011.

² The technical assistance of Mary B. Barnes is gratefully acknowledged.

³ Present address: Dapt. of Anim. Sci. and Industry, Kansas State Univ., Manhattan 66506.

⁴ To whom reprint requests should be addressed.

⁵ Present address: Dept. of Anim. Sci., Univ. of Missouri, Columbia 65211.

⁶ Dept. of Anim. Sci.