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Effects of Nitrogen and Energy Source on Nutrient Digestibility in the Young Pig¹

Texas Tech University³, Lubbock 79409

Abstract

Dried whole whey, lard or dried skim milk was added to a corn-soybean meal basal diet to determine the effect on apparent nitrogen (ND), energy (ED) and dry matter digestibility (DMD) in pigs weaned at 28 d. Four groups of four littermate barrows were allotted to the experimental diets and placed in individual metabolism pens for 12 d (3 d adjustment and three collection periods of 3 d each) after weaning. The study was a 4 x 3 factorial with diet and period as main effects. Addition of dried skim milk or dried whey to the diet resulted in higher values (P<.05) for DMD and ED as compared with the basal or corn-soy and lard diet. Pigs fed added dried skim milk had improved (P<.05) ND over pigs on other dietary treatments. All nutrient digestibility coefficients increased (P<.05) from period 1 to period 2, and ND increased (P<.05) from period 2 to 3. It was concluded that the young pig requires at least 6 to 9 d after weaning at 28 d to adjust to typical corn-soybean meal starter diets.

¹ Approved by the Dean of the College of Agr. Sci., Pub. No. T-5-187.

² Present address: Ext. Anim. Sci. Dept., The Univ. of Georgia, Athens.

³ Anim. Sci. Dept.