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Responses from Cows Fed Silages Containing Imidan Residues^{1, 2,}

Animal Science Department, Georgia Coastal Plain Experiment Station, Tifton, Georgia

M. C. Bowman, D. B. Leuck and E. W. Beck

Entomology Research Division, USDA, Tifton, Georgia

J. C. Derbyshire

Animal Husbandry Research Division, USDA, Beltsville, Maryland

ABSTRACT

When silage was produced from corn treated in the field at rates of 0.56, 1.12, and 2.24 kg of Imidan per hectare and ensiled one day later, about 28% of the ensiled Imidan remained in the silage after approximately 3-months storage. A major portion of the loss occurred during the first 2 weeks of storage. Milk from 12 Jersey cows ingesting Imidan residues at averages of 0.04 to 0.26 mg/kg body weight daily for 56 days was free of Imidan residues (< .01 ppm). However, there was an inexplainable high incidence of abortion among these cows. In a second study 4 pregnant Jersey cows consumed Imidan at an average of 0.22 ing/kg body weight daily for 42 days without any reproduetive problems and produced milk that was free of Imidan and Imidoxon (<.01 ppm). In another study 6 pregnant cows consumed Imidan at averages of 0.33 and 0.44 mg/kg body weight daily in treated silage for 50 days and subsequently produced normal, viable calves.

In these studies daily ingestion of Imidan residues at rates of 0.04 to 0.44 mg/kg body weight for periods of 42 to 56 days failed to affect silage consumption and milk yield, and the cows did not show any ill effects that could be attributed to the ingestion of the residues.

¹ University of Georgia, College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Journal Series Paper No. 201.

² This work was supported in part by funds from the Animal Husbandry Research Division, Agricultural Research Service, USDA.