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http://dx.doi.org/10.5713/ajas.19.0986

Welfare traits of Bos indicus cattle castrated immunologically and fed beta-adrenergic agonists  

Martello, Luciane Silva (College of Animal Science and Food Engineering, University of Sao Paulo)
Antonelo, Daniel Silva (College of Animal Science and Food Engineering, University of Sao Paulo)
Consolo, Nara Regina Brandao (College of Animal Science and Food Engineering, University of Sao Paulo)
Pacheco, Veronica Madeira (College of Animal Science and Food Engineering, University of Sao Paulo)
Negrao, Joao Alberto (College of Animal Science and Food Engineering, University of Sao Paulo)
Rosa, Alessandra Fernandes (College of Animal Science and Food Engineering, University of Sao Paulo)
Leme, Paulo Roberto (College of Animal Science and Food Engineering, University of Sao Paulo)
Sousa, Rafael Vieira (College of Animal Science and Food Engineering, University of Sao Paulo)
Silva, Saulo da Luz (College of Animal Science and Food Engineering, University of Sao Paulo)
Publication Information
Animal Bioscience / v.34, no.9, 2021 , pp. 1552-1558 More about this Journal
Abstract
Objective: This work was carried out to evaluate the effects of zilpaterol hydrochloride (ZH) and ractopamine hydrochloride (RH) combined with immunocastration on the welfare traits of feedlot Nellore cattle. Methods: Ninety-six Nellore males (average body weight [BW] = 409±50 kg; average 20 mo of age) were divided into two groups according to BW; half of the animals in each group received two doses of an immunocastration (ImC) vaccine in a 30 day interval, and the other half did not receive the vaccine (NoC). Afterward, the animals were housed and fed a common diet for 70 days. Then, they were split into three groups and fed one of the following diets for 30 additional days: control (CO) diet, with no β-AA; ZH diet, containing 80 mg/d ZH; and RH diet, containing 300 mg/d RH. Welfare traits were assessed by monitoring body surface temperature using infrared thermography (IRT) and plasma cortisol and temperament measurements. Results: There was no interaction between sexual condition and diet for any trait. The ImC and NoC groups did not differ in rectal and ocular temperatures. The ImC animals had higher flight speeds (p = 0.022) and tended to have higher cortisol levels (p = 0.059) than the NoC animals. Animals fed ZH and RH did not differ in cortisol levels, respiratory rate, rectal temperature, temperature measured by IRT, or temperament behaviour. Conclusion: The ImC animals showed a less stable temperament during handling practices than NoC, whereas ZH and RH supplementation had no adverse effects on animal welfare.
Keywords
Bos indicus Temperament; Cattle Behaviour; Infrared Thermography; Ractopamine Hydrochloride; Zilpaterol Hydrochloride;
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