Performance and carcass characteristics of steers from two genetic groups, finished in feedlot and slaughtered at different weights

Authors

  • Fabiana Maldonado Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios do Noroeste Paulista, Votuporanga, SP
  • Augusto César de Queiroz Universidade Federal de Viçosa, Departamento de Zootecnia, Viçosa, MG
  • Guilherme Fernando Alleoni Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Centro de Pesquisa e Desenvolvimento em Nutrição Animal e Pastagem, Nova Odessa, SP
  • Paulo Roberto Leme Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Departamento de Zootecnia, Pirassununga, SP
  • Celso Boin Consultoria de Planejamento Ltda., São Paulo, SP
  • Flávio Dutra de Resende Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios da Alta Mogiana, Colina, SP
  • Romeu Fernandes Nardon Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Instituto de Zootecnia, Centro de Pesquisa e Desenvolvimento em Nutrição Animal e Pastagem, Nova Odessa, SP
  • João José Assumpção Abreu Demarchi Secretaria de Agricultura e Abastecimento do Estado de São Paulo, Agência Paulista de Tecnologia dos Agronegócios, Polo Regional de Desenvolvimento Tecnológico dos Agronegócios do Extremo Oeste, Andradina, SP
  • Rodrigo Vidal Oliveira Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Zootecnia, Jaboticabal, SP

Keywords:

crossbreeding, fat thickness, loin eye area, sorghum silage

Abstract

Eighteen ¾ Nellore-¼ Canchim and ¾ Nellore-¼ Caracu steers with an initial live weight of 312 and 303kg, respectively, and 22 months of age, were used to evaluate the effects of the genetic groups and different slaughter weight (430, 470 and 530kg) on the dry matter intake, weight gain, feed conversion, loin eye area and fat thickness. The animals were confined and allotted to a completely randomized design, in a 2 X 3 factorial arrangement (genetic groups and slaughter weight), with three replicates. The animals were fed with 43:57 forage to concentrate ratio (dry matter basis) based on sorghum silage and concentrate and weighted at four weeks intervals after 18 hours fasting and slaughtered as they reached the pre-established weights. There was no significant interaction between genetic group and weight at the slaughter time and there was no effect of the genetic group for all the variables studied. However, larger loin eye area (adjusted for 100kg of cold carcass) was observed in the animals slaughtered earlier (27,68cm2 at 430kg) and larger fat thickness was verified in the animals slaughtered lately (10,58mm at 530kg). All the carcass produced attended Brazilian market demands of weight and finishing degree.

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Published

2013-11-25

Issue

Section

ANIMAL NUTRITION

How to Cite

Performance and carcass characteristics of steers from two genetic groups, finished in feedlot and slaughtered at different weights. (2013). Bulletin of Animal Husbandry, 64(1), 9-18. http://bia.iz.sp.gov.br/index.php/bia/article/view/1249

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