URINE DELIVERY OF CYROMAZINE FOR SUPPRESSING HOUSE AND STABLE FLIES (DIPTERA, MUSCIDAE) IN OUTDOOR DAIRY CALF HUTCHES

In a series of 4 trials, dairy calves housed in outdoor hutches were a dministered technical cyromazine daily at rates of 0, 0.1, 0.5, and 1. 0 mg/kg body weight. Cyromazine was excreted primarily in the urine. T he 2 highest rates prevented the development of immature stages of bot h the house fly, Musca domestica L., and the stable fly Stomoxys calci trans (L.). Analysis of calf body tissues for cyromazine and its metab olite, melamine, indicated that highest combined residues (less than o r equal to 0.35 ppm) were found in the kidney. Lower levels of residue s were found in kidney fat and liver, and occasionally in round muscle .