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Evaluation of Cimaterol for Finishing Swine including a Drug Withdrawal Period¹

Institute of Food and Agricultural Science, University of Florida, Gainesville 32611 and American Cyanamid Company, Princeton, NJ 08540

Abstract

One hundred fifty crossbred pigs (55 kg) were allotted by weight, sex and litter to a randomized complete-block design with five dietary treatments, six blocks per treatment and five pigs per pen with sex equalized across treatments. Corn-soybean meal-based diets (.65% lysine) with 0, .25 and .5 mg/kg cimaterol were fed, on an ad libitum basis, to pigs slaughtered at an average pen weight of 104 kg/pig. Drug withdrawal prior to slaughter was 1, 3 and 5 d for pigs fed cimaterol at .25 mg/kg and 1 d for those fed cimaterol at .5 mg/kg of diet. Dietary cimaterol level influenced (quadratic, P < .01) average daily gain during the first 42 d on test; however, daily feed intake and feed conversion ratio were not affected (P > .1). Pigs fed .25 mg/kg cimaterol with a 1-d drug withdrawal had 6.8, 7.7 and 13.5% less 10th rib fat depth and 11.1, 6.1 and 13.3% less P₂ fat depth than those subjected to either a 3- or 5-d drug withdrawal or those fed the 0 mg/kg cimaterol diet (control), respectively. Overall, pigs fed cimaterol had 7.9% larger longissimus muscle area and 2.6% more kilograms of muscle than pigs fed the control diet. Cimaterol fed at .5 mg/kg resulted in higher (P < .05) Warner-Bratzler shear force values and altered the proportion of saturation in some long-chain fatty acids, although the total saturated:unsaturated fat ratio was not affected. Pigs fed no cimaterol had less thaw loss (P < .05) than did those fed other treatments. Cimaterol did not affect (P > .05) carcass length, muscling score, USDA grade, fat firmness, marbling and muscle color, texture or firmness.

¹ Florida Agric. Exp. Sta. Journal Series, No. 8636. Financial Support provided by American Cyanamid Company, Princeton, NJ.

² Anim. Sci. Dept., Univ. of Florida, Gainesville.

³ American Cyanamid Co., Princeton, NJ.