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Carcass characteristics and meat quality of Nellore bulls submittedto different nutritional strategies during cow–calf and stocker phase

Published online by Cambridge University Press:  23 October 2018

N. Andreo ,
A. M. Bridi ,
L. M. Peres ,
É. R. dos Santos ,
A. G. Barro ,
J. R. S. Gonçalves ,
H. C. Bonfá  and
A. V. Pires
N. Andreo*
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid (PR 445), Km 380, CEP 86057-350Londrina, Paraná, Brazil
A. M. Bridi
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid (PR 445), Km 380, CEP 86057-350Londrina, Paraná, Brazil
L. M. Peres
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid (PR 445), Km 380, CEP 86057-350Londrina, Paraná, Brazil
É. R. dos Santos
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid (PR 445), Km 380, CEP 86057-350Londrina, Paraná, Brazil
A. G. Barro
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid (PR 445), Km 380, CEP 86057-350Londrina, Paraná, Brazil
J. R. S. Gonçalves
Affiliation:
Departamento de Zootecnia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid (PR 445), Km 380, CEP 86057-350Londrina, Paraná, Brazil
H. C. Bonfá
Affiliation:
Colegiado Acadêmico de Zootecnia, Universidade Federal do Vale do São Francisco, Rodovia BR-407, lote 543, CEP 56300-000 Petrolina, Pernambuco, Brazil
A. V. Pires
Affiliation:
Departamento de Zootecnia, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Avenida Pádua Dias, CEP 13418-900 Piracicaba, São Paulo, Brazil
*
†E-mail: [email protected]
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Abstract

There have been few studies realized that evaluate the effects of adopting different nutritional systems in more than one phase of cattle production on carcass and meat characteristics. This study was realized to evaluate carcass and meat characteristics from bulls submitted to different nutritional systems during two production phases. The experiment was conducted at Figueira’s farm during two production phases: I (cow–calf) – 80 calves (99.6±2.72 days of age and 109.7±2.99 kg of BW) with their mothers were randomly assigned into two supplemental diets: cow–calf mineral supplement (n=40) or cow–calf creep-feeding (n=40); II (stocker) – the same 80 calves (201.2±2.11 days of age and 190.2±3.37 kg of BW) were redistributed into two production systems: stocker pasture (n=40) or stocker feedlot (SF; n=40). After, all 80 animals were kept on a pasture system (III) for 290 days, and then finished in a feedlot system (IV) for more 33 days. Then, they were slaughtered at an average 764.2±3.06 days of age and at 499.2±3.33 kg of final BW. After slaughter, the average daily gain was calculated, and the carcass and meat characteristics were measured. The statistical model design used was completely randomized in a 2×2 factorial arrangement (two treatment groups on cow–calf phase and two treatment groups on stocker phase). The single effects between the groups in each phase and the interactions between both phases (cow–calf v. stocker) were analyzed. The results were compared by Fisher’s test, using the R statistical software. A cow–calf by stocker phases interaction occurred for carcass conformation and fiber diameter. For single effects, the greatest influences observed were in the stocker phase. The feedlot group was slaughtered 17 days earlier, with greater final BW (3.8%), hot carcass weight (5.7%), average daily gain (6.9%), dressing percentage (1.8%), carcass length (1.8%), carcass width (1.5%), longissimus muscle area (4.8%) and muscle depth (2.3%) than pasture group. The SF group also had influence on fat color; showing higher L* and lower b* values. These results reveal that bulls reared in feedlot at the stocker phase have higher muscle development and that the stocker phase has the greatest potential to influence carcass characteristics and meat quality.

Keywords

backgroundingconformation degreelongissimus thoracissucklingweaning
Type
Research Article
Information
animal , Volume 13 , Issue 7 , July 2019 , pp. 1544 - 1551
Copyright
© The Animal Consortium 2018 

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