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Effects of frequency of zeranol implantation on liveweight gain of steers grazing improved pastures in central queensland australia



Effects of frequency of zeranol implantation on liveweight gain of steers grazing improved pastures in central queensland australia



Australian Journal of Experimental Agriculture & Animal Husbandry 24(127): 460-463



Various combinations of single and repeat zeranol treatment [which causes growth hormone titer increases] were examined during 2 consecutive growing seasons, using Brahman .times. Murray Grey crossbred steers grazing improved pastures at Moura in central Queensland. Compared with untreated controls, the response (P < 0.05) to the initial implant of 36 mg zeranol varied from 0.166 to 0.208 kg liveweight/day during the 92-98 d period after implantation. Repeat implantations gave responses of 0.061 (P > 0.05) and 0.101 (P < 0.05) kg/day during the following 97 and 94 days. Steers that had only one implant gained more quickly than those on their repeat implant at the same time: 1.161 vs. 1.014 (P < 0.05) and 0.658 vs. 0.593 (P > 0.05) kg/day in the 2 seasons, respectively. Final liveweight was similar for steers given 4 implants over both growing seasons (594 kg), 2 implants to give response during the 2nd growing season (592 kg), and 1 implant to cover the 2nd half of the 1st growing season, and 1 implant to cover the latter half of the 2nd growing season (589 kg). When managerial factors and cost of the drug are considered, the preferred strategy appears to be either 2 implants during the final growing season, or 1 implant during each of the 2 growing seasons.

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Accession: 005304895

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