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The phenotypic relationship between residual intake and gain and other feed efficiency traits in Nellore cattle |
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| Authors: | de Figueiredo Darcilene Maria Mercadante Maria Eugênia Zerlotti Pires Aldrin Vieira Branco Renata Helena Ribeiro Enilson Geraldo Dallago Gabriel Machado Schorer Marianne Rocha Pedro Ribeiro |
| Affiliation: | 1.Departamento de Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri–JK Campus, Rodovia MGT 367–Km 583, 5000, Diamantina, MG, 39.100-000, Brazil ;2.Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sert?ozinho, SP, 14.160-900, Brazil ;3.Instituto de Zootecnia, Centro APTA Bovinos de Leite, Nova Odessa, SP, 13.460-000, Brazil ;4.Instituto Federal de Ciência e Tecnologia de Mato Grosso–Juína Campus, Juína, MT, 78.320-000, Brazil ; |
| Abstract: | This study aimed to compare feed efficiency measures of Nellore beef cattle on different residual intake and gain (RIG) classes. We used data from 610 animals weighing on average 236.33 kg and average of 283 days of age from feedlot performance tests carried out between 2005 and 2012. Animals were grouped based on RIG into three different classes: high RIG (>?mean?+?0.5 standard deviation (SD), most efficient; n?=?193), medium RIG (mean?±?0.5 SD; n?=?235), and low RIG (n?=?182). Residual feed intake (RFI), residual gain (RG), feed conversion ratio (FCR), feed efficiency (FE), relative growth rate (RGR), and Kleiber ratio (KR) of animals in each RIG class were compared by Tukey test at 1% of probability. Phenotypic correlations between variables were evaluated as well. Animals on high RIG class showed lower dry matter intake (P?P?P?P?P?P?P? |
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