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Use of a Rye-Soybean Ration to Evaluate Growth Promotants in Chickens

1978; Elsevier BV; Volume: 57; Issue: 5 Linguagem: Inglês

10.3382/ps.0571297

1525-3171

W.L. Marusich, E.F. Ogrinz, N. CAMERLENGO, M. Mitrovic,

Plant and animal studies

A rye-soybean ration was used to measure the growth and feed conversion responses of day-old chicks to 17 antibacterial growth promotants and three hormonal anabolic agents. Each compound was fed to 3, 4, or 5 replicates of six battery reared birds in one of five trials and the weight gain and feed intake recorded through 14 days. Statistically significant (P<.05) increased growth and improved feed conversion were obtained with all 17 antibacterial growth promotants at the levels tested: 5 and 50 ppm of aurodox and penicillin; 50 ppm of bacitracin methylene disalicylate, chlortetracycline, coumermycin, fosfomycin, mocimycin, nitrovin, novobiocin, vancomycin, and zinc bacitracin; 38.5 ppm neomycin; 20 ppm erythromycin; 10 ppm bambermycins, carbadox and thiopeptin and 2.2 and 4.4 ppm lincomycin. The feeding of the 3 hormonal anabolic agents, diethylstilbestrol or zeranol at 10 ppm or melengestrol acetate at 1 ppm was ineffective in improving rate of weight gain or feed efficiency. The rye-soybean ration is responsive to compounds possessing widely different spectra of antibacterial activity but not to those with hormonal anabolic activity. The data obtained are consistent, reproducible, and of sufficient magnitude to be statistically significant with only limited replication. The results are also in agreement with those obtained utilizing a typical corn-soybean broiler starter ration but a far greater magnitude of response is elicited with the rye ration. The utility of the rye ration in trials of eight weeks duration and the possible mode of action are discussed.