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Use of magnetic resonance imaging to predict the body composition of pigs in vivo

Published online by Cambridge University Press:  11 December 2012

P. V. Kremer ,
M. Förster  and
A. M. Scholz
P. V. Kremer
Affiliation:
Faculty of Agriculture, University of Applied Sciences Weihenstephan-Triesdorf, Steingruberstr. 2, D-91746 Weidenbach, Germany Livestock Center of the Veterinary Faculty, University of Munich, St. Hubertusstr. 12, D-85764 Oberschleissheim, Germany
M. Förster
Affiliation:
Livestock Center of the Veterinary Faculty, University of Munich, St. Hubertusstr. 12, D-85764 Oberschleissheim, Germany Chair for Animal Breeding and Husbandry, Department of Veterinary Sciences, University of Munich, D-80539 München, Germany
A. M. Scholz*
Affiliation:
Livestock Center of the Veterinary Faculty, University of Munich, St. Hubertusstr. 12, D-85764 Oberschleissheim, Germany
*
†E-mail: [email protected], [email protected], [email protected]
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Abstract

The objective of the study was to evaluate whether magnetic resonance imaging (MRI) offers the opportunity to reliably analyze body composition of pigs in vivo. Therefore, the relation between areas of loin eye muscle and its back fat based on MRI images were used to predict body composition values measured by dual energy X-ray absorptiometry (DXA). During the study, a total of 77 pigs were studied by MRI and DXA, with a BW ranging between 42 and 102 kg. The pigs originated from different extensive or conventional breeds or crossbreds such as Cerdo Iberico, Duroc, German Landrace, German Large White, Hampshire and Pietrain. A Siemens Magnetom Open was used for MRI in the thorax region between 13th and 14th vertebrae in order to measure the loin eye area (MRI-LA) and the above back fat area (MRI-FA) of both body sides, whereas a whole body scan was performed by DXA with a GE Lunar DPX-IQ in order to measure the amount and percentage of fat tissue (DXA-FM; DXA-%FM) and lean tissue mass (DXA-LM; DXA-%LM). A linear single regression analysis was performed to quantify the linear relationships between MRI- and DXA-derived traits. In addition, a stepwise regression procedure was carried out to calculate (multiple) regression equations between MRI and DXA variables (including BW). Single regression analyses showed high relationships between DXA-%FM and MRI-FA (R2 = 0.89, √MSE = 2.39%), DXA-FM and MRI-FA (R2 = 0.82, √MSE = 2757 g) and DXA-LM and MRI-LA (R2 = 0.82, √MSE = 4018 g). Only DXA-%LM and MRI-LA did not show any relationship (R2 = 0). As a result of the multiple regression analysis, DXA-LM and DXA-FM were both highly related to MRI-LA, MRI-FA and BW (R2 = 0.96; √MSE = 1784 g, and R2 = 0.95, √MSE = 1496 g). Therefore, it can be concluded that the use of MRI-derived images provides exact information about important ‘carcass-traits’ in pigs and may be used to reliably predict the body composition in vivo.

Keywords

MRIin vivo body compositionpigs
Type
Breeding and genetics
Information
animal , Volume 7 , Issue 6 , June 2013 , pp. 879 - 884
Copyright
Copyright © The Animal Consortium 2012

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