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Using real-time ultrasound for in vivo assessment of carcass and internal adipose depots of dairy sheep

Published online by Cambridge University Press:  23 March 2020

J. Afonso Open the ORCID record for J. Afonso [Opens in a new window] ,
C. M. Guedes ,
A. Teixeira ,
V. Santos ,
J. M. T. Azevedo  and
S. R. Silva
J. Afonso*
Affiliation:
Faculdade de Medicina Veterinária, ULisboa, Avenida da Universidade Técnica1300-477, Lisboa, Portugal
C. M. Guedes
Affiliation:
Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, 5001-801Vila Real, Portugal
A. Teixeira
Affiliation:
CIMO, Instituto Politécnico de Bragança, 5300-253, Portugal
V. Santos
Affiliation:
Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, 5001-801Vila Real, Portugal
J. M. T. Azevedo
Affiliation:
Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, 5001-801Vila Real, Portugal
S. R. Silva
Affiliation:
Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, 5001-801Vila Real, Portugal
*
Author for correspondence: J. Afonso, E-mail: jafonso@fmv.ulisboa.pt
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Abstract

Fifty-one Churra da Terra Quente ewes (4–7 years old) were used to analyse the potential of real-time ultrasound (RTU) to predict the amount of internal adipose depots, in addition to carcass fat (CF). The prediction models were developed from live weight (LW) and RTU measurements taken at eight different locations. After correlation and multiple linear regression analysis, the prediction models were evaluated by k-fold cross-validation and through the ratio of prediction to deviation (RPD). All prediction models included at least one RTU measurement as an independent variable. Prediction models for the absolute weight of the different adipose depots showed higher accuracy than prediction models for fat content per kg of LW. The former showed to be very good or excellent (2.4 ⩽ RPD ⩽ 3.8) for all adipose depots except mesenteric fat (MesF) and thoracic fat, with the model for MesF still providing useful information (RPD = 1.8). Prediction models for fat content per kg of LW were also very good or excellent for subcutaneous fat, intermuscular fat, CF and body fat (2.6 ⩽ RPD ⩽ 3.2), while the best prediction models for omental fat, kidney knob, channel fat and internal fat still provided useful information. Despite some loss in the accuracy of the estimates obtained, there was a similar pattern in terms of RPD for models developed from LW and RTU measurements taken just at the level of the 11th thoracic vertebra. In vivo RTU measurements showed the potential to monitor changes in ewe internal fat reserves as well as in CF.

Keywords

Fat reservesmature ewesultrasonic evaluation
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 157 , Issue 7-8 , October 2019 , pp. 650 - 658
Copyright
Copyright © Cambridge University Press 2020

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