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Using carcass information as a predictor variable of empty body weight, empty body weight gain and retained energy of hair sheep

Published online by Cambridge University Press:  20 November 2024

Antonio de Sousa Brito Neto
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, Ceara, Brazil
Caio Julio Lima Herbster
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, Ceara, Brazil
Marcos Inacio Marcondes
Affiliation:
Department of Animal Science, Washington State University, Pullman, WA, USA
Juana Catarina Cariri Chagas
Affiliation:
Departament of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences, Umeå, Sweden
Ronaldo Lopes Oliveira
Affiliation:
School of Veterinary Medicine and Animal Science, Federal University of Bahia, Salvador, Bahia, Brazil
Leilson Rocha Bezerra
Affiliation:
Center of Health and Agricultural Technology, Federal University of Campina Grande, Patos, Paraiba, Brazil
Luciano Pinheiro da Silva
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, Ceara, Brazil
Elzania Sales Pereira*
Affiliation:
Department of Animal Science, Federal University of Ceara, Fortaleza, Ceara, Brazil
*
Corresponding author: Elzania Sales Pereira; Email: [email protected]

Abstract

The objective was to develop equations to predict carcass weight (CW), use CW to predict empty body weight (EBW); and carcass gain (CG) to predict empty body weight gain (EBWG) and retained energy (RE) in hair sheep. To generate the prediction models, a data set was composed of individual measurements from 569 sheep encompassing intact males (n = 416), castrated males (n = 51), and females (n = 102). Validation analyses were performed by using the Model Evaluation System (MES). The prediction equations for CW, EBW, and EBWG were not influenced by sex class (P > 0.05), and the following equations were generated, respectively: CW (kg) = − 0.234 (±1.1358) + 0.485 (±0.0387) × FBW; EBW (kg) = 1.367 (±0.5472) + 1.681 (±0.0210) × CW and EBWG (kg) = 0.004 (±0.0026) + 1.679 (±0.0758) × CG. There was an effect of sex class on the intercept (P = 0.0013) of the relationship between RE and CG: RE (MJ/day) = 1.448 (±0.0657) × EBW0.75 × CG0.797 (±0.0399); RE (MJ/day) = 1.522 (±0.0699) × EBW0.75 × CG0.797 (±0.0399) and RE (MJ/day) = 1.827 (±0.0739) × EBW0.75 × CG0.797 (±0.0399) for intact males, castrated males and females, respectively. This study highlights the importance of incorporating carcass information into EBW, EBWG, and RE predictions. Replacing empty body weight gain with carcass gain might be a suitable alternative to estimate the retained energy of hair sheep. In addition, the generated equations will provide support for meat production systems in carcass weight prediction.

Type
Animal Research Paper
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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