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Tissue Residues of Steers Grazed on Wheat Pasture Treated with Indar Systemic Fungicide¹

Wagner Oklahoma Agricultural Experiment Station, Stillwater 74074

Abstract

Residues in tissues (skeletal muscle, fat, liver and kidney, and fecal and urine grab samples of steers that grazed an INDAR fungicide-treated wheat pasture for 4 weeks, and after 1- or 3-week withdrawl periods of grazing a non-treated wheat pasture were measured. INDAR parent compound (4-butyl-4H-l,2,4-triazole) concentrations ranged from 35 to 71 ppm of forage dry matter during the initial 4-week period and were higher than those that would be expected with normally recommended applications of INDAR fungicide. No effects of INDAR fungicide on steer grazing behavior or general alertness were observed. Total residue concentrations (INDAR fungicide and its metabolites or degradation products having the 1,2,4-triazole ring) in skeletal muscle, fat, liver and kidney samples averaged .50, .17, .84 and .57 ppm, respectively, at the end of the initial 4-week period on the treated wheat pasture. Tissue residues after a 3-week withdrawl period, and fecal and urine residues after 1- or 3-week withdrawal periods were not different (P>.05) from those of steers that grazed the nontreated pasture during the initial 4-week period. The data show that tissue residues of INDAR fungicide declined rapidly after stocker cattle are removed from the fungicide-treated pasture and would be expected to be extremely low in cattle from wheat pastures that received normal applications of the fungicide.

¹ Journal Article 3532 of the Agricultural Experiment Station, Oklahoma State University, Stillwater, 74074. This paper reports the results of research only. Mention of a fungicide in this paper does not constitute a recommendation for use by the US Department of Agriculture nor does it imply registration under FIFRA as amended. Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the US Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.

² Southwestern Livestock and Forage Research Station, USDA, SEA, El Reno OK 73036.

³ Agricultural Products Research (Fungicides and Biocides), Research Laboratories, Rohm and Haas Co., Spring House, PA 19477.