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Elfazepam and Synovex-S Influences on Growth and Carcass Characteristics of Steers Fed Two Dietary Energy Levels¹

U. S. Department of Agriculture, Clay Center, NE 68933 and and University of Pennsylvania, Kennett Square 19348

Abstract

Responses to the chemical feed intake stimulant, Elfazepam⁶ (7-chloro-l-[2(ethylsulfonyl)ethyl] -5-(2-fluorophenyl)-1,3-dihydro-2H-l,4-benzodiazepin-2-one), the anabolic implant Synovex-S⁶, and dietary energy level were investigated in a 2 x 2 x 2 factorial experiment using 217 hd steers in eight pens. Corn silage represented 81.7% and 19.7% of the dry matter in the low and high energy diets, respectively, resulting in 2.6 and 3.1 Meal metabolizable energy per kilogram for the two diets. Elfazepam was added to the diet to provide about 8 mg/head/day. Steers were fed to 510-kg pen mean weights.

At constant carcass weight, steers receiving Elfazepam had a 9% smaller average daily gain (ADG) and carcass soft tissue was estimated to contain more protein and less fat compared to unsupplemented controls. Steers implanted with Synovex-S had a 27% greater ADG and less kidney and pelvic fat than for nonimplanted steers. Steers fed the HE diet had a 31% greater ADG and carcass soft tissue was estimated to contain more fat and less protein than steers fed the LE diet. At constant carcass weight, the carcass traits of fat thickness, longissimus area, marbling, quality grade and yield grade were not significantly changed by dietary energy level, Synovex-S implant or Elfazepam supplement. With certain cost and price assumptions for this experiment, the value of the gain per day on feed was 30% higher for the steers fed the HE ration, and 25% higher for steers implanted with Synovex-S but 8% lower for steers receiving Elfazepam.

¹ Cooperation of the Nebraska Agricultural Experiment Station, University of Nebraska, Lincoln is acknowledged. Mention of a trade name, proprietary product or specific equipment does not constitute a guarantee or warranty by the U. S. Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.

² Research Chemist, Science and Education Administration, U. S. Meat Animal Research Center, Clay Center, NE 68933.

³ Research Food Technologist, Science and Education Administration, U. S. Meat Animal Research Center, Clay Center, NE 68933.

⁴ Economist, Economics, Statistics and Cooperatives Service, U. S. Meat Animal Research Center, Clay Center, NE 68933.

⁵ Associate Professor of Nutrition, University of Pennsylvania, Kennett Square 19348.