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The Development of Digestive Capacity in Young Pigs: Effects of Weaning Regimen and Dietary Treatment^1,2,

North Carolina State University⁵, Raleigh 27650

Abstract

In Exp. 1, 24 crossbred pigs were weaned at 21 d of age to either a 24% milk protein diet or a 24% soy protein diet, both of which were fed hourly in liquid form. In Exp. 2, 45 cross bred pigs were weaned at 21 d of age to either a 24% milk protein diet fed hourly in liquid form, the same diet fed ad libitum in dry form or a 24% protein, corn soybean meal diet fed ad libitum in dry form. Pigs were killed at 7 or 14 d postweaning in Exp. 1 and 7, 14 or 21 d postweaning in Exp. 2. In both experiments, pigs fed milk based diets had faster weight gains and more efficient feed conversion ratios than pigs fed diets containing soy protein. All data are expressed as units per kilogram body weight. Pigs fed a soy protein diet tended to have a greater intestinal length than pigs fed milk protein diets. Growth of the pancreas in relation to body weight was greater in pigs fed diets containing soy protein than in pigs fed milk protein. Pigs fed a soy protein diet tended to have greater trypsin and chymotrypsin activities in the intestinal contents and lower activities in the pancreas than did pigs fed milk based diets. These results suggest that soy containing diets caused a greater secretion of trypsin ad chymotrypsin into the intestine than did milk containing diets.

¹ Paper No. 7025 of the Journal Ser. of the North Carolina Agr. Res. Ser., Raleigh. Use of trade names in this publication does not imply endorsement of the products mentioned.

² The statistical advice of Dr. A. C. Linnerud is greatly appreciated.

³ Present address: Bowman-Gray School of Medicine, Winston-Salem, NC.

⁴ Present address: Carl S. Akey, Inc., Lewisburg, OH.

⁵ Dept. of Anim. Sci.