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Effect of Grain Source and Dietary Level of Oat Hulls on Phosphorous and Calcium Utilization in the Growing Pig^1,2,

University of Nebraska, Lincoln 68583

Abstract

Three metabolism trials were conducted to determine the effect of grain source and dietary level of oat hulls on dry matter digestibility, P and Ca retention and intestinal phytase activity of growing pigs. Twenty-four crossbred pigs (39 kg) were used. Dry matter digestibilities of corn-based diets were greater (P<.01) than grain sorghum-based diets (74.7 vs 63.5%). Diets containing 10% oat hulls had lower (P<.01) dry matter digestibilities than diets containing no oat hulls (64.0 vs 74.2%). The reduction in dry matter digestibility was similar with the addition of oat hulls to the diet, regardless of the source of grain. P and Ca retentions were not affected by dietary treatments. Fecal excretion of P was higher (P<.10) for pigs fed 10% oat hulls than for those fed no oat hulls. Fecal excretion of Ca and urinary excretion of Ca and P were not affected by dietary treatment. Intestinal phytase activity was evident in all pigs, but the dietary treatments had no apparent influence on phytase production in the small intestine.

¹ Published as Paper No. 6080 Journal Ser. Nebraska Agr. Exp. Sta.

² Dept. of Anim. Sci. Acknowledgment is made to Mary Barnes and Cecillia Stodd for their laboratory assistance, and to Alice Teter and Diana Smith for preparation of this manuscript.