Author:
PROUDFOOT F. G.,HULAN H. W.,JACKSON E. D.
Abstract
Three thousand two hundred male broiler chickens were used to evaluate the efficacy of chlortetracycline (CTC) as a growth promoter when used in compliance with the present maximum feed-supplementation rate permitted in Canada (5.5 mg kg−1). No significant (P > 0.05) improvements in 21- and 42-d live body weights or feed conversion efficiencies were observed, regardless of the method of administration (feed or water). Changes to the sources of dietary calcium and phosphorus in an attempt to circumvent antibiotic inactivation by divalent cations also failed to potentiate any effect of this level of CTC. It is suggested that, if adequate attention is paid to the diet and health of broiler stocks, no further gains will be realized through feed supplementation with 5.5 mg kg−1 CTC. Key words: Diets, antibiotics, aureomycin, chlortetracycline, broiler chicken
Publisher
Canadian Science Publishing
Subject
Animal Science and Zoology,Food Animals
Cited by
2 articles.
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