Efficacy of Hormonal Growth Promoter Implants on the Performance of Grazing Steers of Different Breeds in Southern Chile

Rivero, M. Jordana, Araya, Luis, Oyarzo, Marcelo , Cooke, Andrew S., Morgan, Sarah A. and Merino, Veronica M. (2021) Efficacy of Hormonal Growth Promoter Implants on the Performance of Grazing Steers of Different Breeds in Southern Chile. Sustainability, 13 (16). ISSN 2071-1050

Full content URL: https://doi.org/10.3390/su13169135

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Efficacy of Hormonal Growth Promoter Implants on the Performance of Grazing Steers of Different Breeds in Southern Chile
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Abstract

Increasing demands for land is necessitating the optimisation of grazing land used for livestock production. Hormonal growth promoter implants (HGPI) are widely used to improve cattle performance and thus land-use efficiency. However, there is limited information on their efficacy in grazing systems. Forty grazing steers, 10 of each breed (Angus, Hereford, Holstein, Overo Colorado), had growth rates monitored for 85 days after which half received HGPI and half continued as a control. Growth rates were monitored for an additional 61 days and performance between the groups compared. Implants had a significant impact on liveweight gain (LWG; p = 0.013), and whilst breed did not (p = 0.65), there was an interaction effect of breed � treatment (p = 0.029). For three of the four breeds, the LWG was greater in the implant group (mean +14.3%). The exception was for Holstein steers which did not respond to the implant. In general, HGPI were found to be effective in increasing LWG of grazing cattle and thus has the potential to increase yield densities and relieve pressures of land use and competition. The efficacy may be affected by breed and other extraneous factors not covered in this study. Furthermore, the use of HGPI must be carefully considered in a wider context since its use might have secondary impacts.

Additional Information:Number: 16 Publisher: Multidisciplinary Digital Publishing Institute
Keywords:anabolic implants, average daily gain, beef breeds, dairy breeds, grazing
Subjects:D Veterinary Sciences, Agriculture and related subjects > D421 Livestock Husbandry
D Veterinary Sciences, Agriculture and related subjects > D300 Animal Science
D Veterinary Sciences, Agriculture and related subjects > D400 Agriculture
D Veterinary Sciences, Agriculture and related subjects > D420 Livestock
Divisions:College of Science > School of Life Sciences
ID Code:49751
Deposited On:12 Jul 2022 14:32

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