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Some Effects of Feeding Stilbestrol, Chlortetracycline and Penicillin with Alfalfa Soilage on Steer Performance and Carcass Quality¹

Washington Agricultural Experiment Stations, Irrigation Experiment Station, Prosser²

Abstract

Seventy-two steers (36 each year) were randomly assigned to six treatments which included daily oral supplementation (mg.) of: (1) stilbestrol, 10; (2) chlortetracycline, 75; (3) penicillin, 32; (4) stilbestrol and chlortetracycline, 10 and 75; (5) stilbestrol and penicillin, 10 and 32; and (6) control. A modification of the paired-feeding technique was used to maintain equal feed intake among all cattle within years.

Steers that received additives, alone or in combination, gained faster and were more efficient in feed conversion. Carcass measurements were not affected by treatments. There was a significant difference of the bulbourethral diameter among treatments. The interaction of antibiotics and stilbestrol indicates they cancelled out the effects of one another on bulbourethral size.

Penicillin provided bloat protection when less mature alfalfa soilage was fed.

¹ Scientific Paper No. 2225, Washington Agricultural Experiment Station, Pullman, Washington. Project 1347.

² This work was supported in part by a grant from American Cyanamid Co. "Stilbosol" was provided by Eli Lilly & Co. Merck, Sharpe & Dohme supplied the procaine penicillin G.