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Effects of immunocastration and a β-adrenergic agonist on retail cuts of feedlot finished Nellore cattle

Published online by Cambridge University Press:  19 December 2017

D. J. Brigida
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
D. S. Antonelo
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
M. R. Mazon
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
K. E. Z. Nubiato
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
J. F. M. Gómez
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
A. S. Netto
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
P. R. Leme
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
N. R. B. Cônsolo
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
D. M. C. Pesce
Affiliation:
Department of Veterinary Medicine, Pontifical Catholic University of Minas Gerais, Poços de Caldas, 37701-355, Brazil
S. L. Silva
Affiliation:
Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, 13635-900, Brazil
Corresponding
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Abstract

Immunocastration (ImC) has been proposed as an animal welfare-friendly alternative to reduce sexual and aggressive behavior and to increase carcass fat deposition with positive effects on meat quality. The β-adrenergic agonists (β-AA) are known as repartitioning agents that acts increasing lean tissue deposition. The combined use of these technologies can positively affect meat quality and increase retail cuts yield. Thus, this research was conducted to evaluate the combined effects of ImC and β-AA (zilpaterol hydrochloride (ZH) and ractopamine hydrochloride (RH)) on retail cuts, bones, and fat trim of feedlot finished Bos indicus (Nellore) cattle. No interaction was observed between sexual condition and diet for any trait. The ImC decreased cold carcass, hindquarter (HQ), forequarter (FQ) and combined brisket, short ribs and flank (BSF) weights. The ImC also showed smaller weights of retail cuts and bones on the HQ and on the FQ than non-castrated (NoC). Fat trim weights did not differ from ImC and NoC. The most of subprimal cuts were heavier in NoC than in ImC. Feeding β-AA did not affect cold carcass weight; however, animals fed ZH had higher weights of HQ and retail cuts in HQ when compared with RH and control (CO) group, with no differences between RH and CO for both traits. The weights of FQ, BSF, retail cuts in FQ, as well as bones and fat trimmings were not affected by β-AA. In summary, ImC decreases carcass and retail cut weights, whereas ZH supplementation leads to an improvement in carcass lean tissue and retail cuts.

Type
Research Article
Information
animal , Volume 12 , Issue 8 , August 2018 , pp. 1690 - 1695
Copyright
© The Animal Consortium 2017 

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Footnotes

a

Present address: Animal Science Department, College of Animal Science and Food Engineering, University of Sao Paulo, Pirassununga, SP 13635-900, Brazil.

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