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Growth Inhibitory Effect of Oat Hulls in Rations for Growing-Finishing Swine

Illinois Agricultural Experiment Station, Urbana

Abstract

The growth-inhibiting effect of oat hulls in rations for growing-finishing swine was studied in five experiments involving 108 individually-fed pigs. Adding hulls at levels of 15 and 30% to hulled-oat rations or to corn-soybean oil meal rations significantly reduced growth rate and feed efficiency of 100-lb. pigs. With 50-lb. pigs, 7 and 13% hulls markedly depressed performance.

Adding 0.1% of a dried rumen product to rations containing hulls had no apparent beneficial effect.

When crude corn oil was added to provide calculated TDN equal to the control rations, the growth-inhibiting effect of the hulls was largely overcome. Controlling the daily TDN intake of 50-lb. pigs resulted in similar gains and feed efficiencies when rations of different hull percentages were fed.

The results suggest that the growth-inhibiting effect of oat hulls is mediated through the dilution of TDN value of the ration and lowered feed intake.

¹ The authors wish to acknowledge McMillen Feed Mills, Inc., Fort Wayne, Indiana; A. E. Staley Mfg. Co., Decatur, Illinois; Merck & Co., Rahway, New Jersey; American Cyanamid Co., Pearl River, New York; Illinois Farm Supply Co., Chicago, Illinois; and Midwest Dried Milk Co., Dundee, Illinois, for funds and products which made this study possible.