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Prediction of physical characteristics of the lamb carcass using in vivo bioimpedance analysis

Published online by Cambridge University Press:  27 November 2018

A. B. Moro Open the ORCID record for A. B. Moro [Opens in a new window] ,
C. C. Pires ,
L. P. da Silva ,
A. M. Menegon ,
R. S. Venturini ,
A. A. Martins ,
R. de O. Mello  and
D. B. Galvani
A. B. Moro*
Affiliation:
Department of Animal Science, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Cidade Universitária, Bairro Camobi, Santa Maria, RS 97105-900, Brazil
C. C. Pires
Affiliation:
Department of Animal Science, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Cidade Universitária, Bairro Camobi, Santa Maria, RS 97105-900, Brazil
L. P. da Silva
Affiliation:
Department of Animal Science, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Cidade Universitária, Bairro Camobi, Santa Maria, RS 97105-900, Brazil
A. M. Menegon
Affiliation:
Department of Animal Science, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Cidade Universitária, Bairro Camobi, Santa Maria, RS 97105-900, Brazil
R. S. Venturini
Affiliation:
Instituto Federal de Educação, Ciência e Tecnologia Farroupilha, Campus of Santo Augusto, Rua Fábio João Andolhe, 1100, Bairro Floresta, Santo Augusto, RS 98590-000, Brazil
A. A. Martins
Affiliation:
Department of Animal Science, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Cidade Universitária, Bairro Camobi, Santa Maria, RS 97105-900, Brazil
R. de O. Mello
Affiliation:
Department of Food Science and Technology, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Cidade Universitária, Bairro Camobi, Santa Maria, RS 97105-900, Brazil
D. B. Galvani
Affiliation:
Embrapa Caprinos e Ovinos, Rodovia Sobral/Groaíras, km 4, Zona Rural, Sobral, CE 62010-970, Brazil
*
†E-mail: [email protected]
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Abstract

The increase of sheep meat competitiveness in international markets can be attributed to the rise of the quantity and the improvement of the quality of the edible portion of sheep carcasses. Usually, carcass yield is established after the slaughter of the animals. Yet, when carcass yield is determined in vivo, it can be both a costly and subjective method. This study proposes models for predicting the physical characteristics of lamb carcass using bioimpedance analysis (BIA) in live animals. Thirty-one Texel × Ile de France crossbreed ram lambs were slaughtered at 20, 26, 32 or 38 kg of BW. Before the slaughter, values of resistance (Rs) and reactance (Xc) were collected using a single-frequency BIA equipment (Model RJL Quantum II Bioelectrical Body Composition Analyzer). Then, BIA main variables such as body bioelectrical volume (V), phase angle (PA), resistive density (RsD) and reactive density (XcD) were calculated. After slaughter, cold carcass weight (CCW), cold carcass yield (CCY), subcutaneous fat thickness (SFT), soft tissue weight (STW) and soft tissue yield (STY) were also measured. Multiple regression analyses were carried out using the physical characteristics as dependent variables and the bioimpedance values as independent variables. Predictive performance of the models was assessed using leave-one-out cross-validation. The prediction model of CCW was obtained using the V, PA and RsD (R2 = 0.97), STW through the V, RsD and XcD (R2 = 0.97), CCY by Rs, Z and XcD (R2 = 0.69), STY by V and XcD (R2 = 0.67), and SFT only for XcD (R2 = 0.84). The results indicated that BIA has the potential to predict carcass characteristics of lambs at different body masses.

Keywords

sheepcarcass traitssoft tissue yieldbody compositionimpedance
Type
Research Article
Information
animal , Volume 13 , Issue 8 , August 2019 , pp. 1744 - 1749
Copyright
© The Animal Consortium 2018 

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