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Utilization of Corn-Soybean Meal-Substituted Diets by Dogs

University, of Illinois, Urbana 61801

To whom correspondence should be addressed.

Abstract

Ten adult female pointers were used in metabolism trials conducted to evaluate the efficacy of substituting portions of a corn-soybean meal basal diet with 20% tallow, 20% lard or 30% meat and bone meal, and to compare cooked and uncooked high energy feedstuffs (rice, oats and corn). Three metabolism trials were performed in which the corn-soy basal served as the control and the fats and meat and bone meal as the experimental treatments. Three additional metabolism trials compared the utilization of cooked and uncooked rice, oats and corn. Feed and feces were anlayzed for dry matter content, and digestibilities of starch and cellulose were subsequently determined. Fecal moisture and nitrogen balance data were also collected. In all trials, dry matter digestibility was found to be unaffected by treatment. The starch present in all diets was highly digestible. Cooking of oats significantly improved starch digestibility of this energy source over that of the uncooked control (95.8 vs 93.8%). Starch digestibility of rice and corn was unaffected by cooking. Cellulose digestibility was significantly increased when the 20% lard and 30% meat and bone meal diets were fed. Cellulose digestion by dogs fed cooked rice or oats was significantly greater than that by dogs fed uncooked feedstuffs. Fecal moisture was reduced by 25.2% when meat and bone meal was substituted for soybean meal. Dogs fed 20% tallow or 20% lard consumed more nitrogen than did their respective controls. Animals fed cooked rice ingested 6.6% more nitrogen than did those fed the uncooked cereal. More fecal nitrogen was excreted by animals fed uncooked oats then by those fed cooked oats (19.3 vs 15.5 g/5 days, respectively). Although significant treatment differences in absorbed and retained nitrogen were observed, no differences in retained nitrogen expressed as a percentage of nitrogen intake were noted in any of the experiments.

¹ Dept. of Anim. Sci.

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