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The Effects of Corn Treated with Fungicides upon the Performance of Fattening Steers

University of Nebraska¹

Abstract

Thirty-three yearling Hereford steers were individually fed to study the toxic effects of the seed protectants Arasan and Orthocide in fattening rations. Seven treatments were used: control, 3 levels of Arsan and 3 levels of Orthocide.

No toxic effects were noted during the 140-day feeding period. The steers did not scour, go off feed, or exhibit any other digestive disturbances and they did not appear abnormal in any way.

Arasan tended to depress feed consumption, whereas Orthocide did not. As the feed consumption of the steers fed Arasan treated corn decreased, gains decreased. Differences in feed consumption between treatments were significant at the 5% level,however, differences in gain between treatments were not significant.

Based on the results obtained it is suggested that Arasan treated corn be processed to remove half of the original fungicide or mixed with non-treated grains so that the daily consumption of Arasan will not furnish more than 125 mg. of tetramethyl thiuram disulphide per 100 lb. of liveweight for yearling steers. In this investigation fattening yearling steers tolerated 725 mg. of captan per 100 lb. of liveweight daily. However, at this level feed consumption was depressed, but gains and the efficiency of feed utilization were not.

¹ Published with the approval of the Director as Paper No. 780, Journal Series, Nebraska Agricultural Experiment Station. This investigation was supported in part by a grant-in-aid from several of the Hybrid Seed Corn Producers in Nebraska, by E. I. duPont de Nemours & Company, Wilmington, Delaware and California Spray-Chemical Corporation, Richmond, California.