Translational Animal Science Abstract -

Genetic parameters of in vivo primal cuts and body composition (PigAtlas) in pigs measured by computed tomography (CT)1

 

This article in TAS

  1. Vol. 1 No. 4, p. 599-606
    unlockOPEN ACCESS
     
    Received: Oct 09, 2017
    Accepted: Oct 23, 2017
    Published: November 22, 2017


    2 Corresponding author(s): jorgen.kongsro@norsvin.no
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doi:10.2527/tas2017.0072
  1. J. Kongsro 2*,
  2. L. E. Gangsei†‡,
  3. T. M. Karlsson-Drangsholt* and
  4. E. Grindflek*
  1. * Norsvin SA, Storhamargata 44, N-2317 Hamar, Norway
     Animalia, Postboks 396 - Økern, N-0513 Oslo, Norway
     Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences (NMBU), P.O. Box 5003, N-1432 Ås, Norway

Abstract

Genetic parameters of in vivo primal cuts in breeding pigs using computed tomography were estimated. A total of 2,439 Duroc and 1998 Landrace boars from the Topigs Norsvin boar testing station in Norway were CT scanned as part of the genetic program. In vivo primal cuts were derived from the CT images using atlas segmentation; the method called the Pig Atlas. The (co)variance estimates were obtained from univariate (heritabilities) and multivariate (correlations) animal genetic models using DMU software. The heritabilities for all primal cuts proportions (%) were intermediate to large for both breeds, h2 ranging from 0.15 to 0.50. Negative genetic correlations were found between most of the other primal cuts, and the strongest correlation was between belly and ham. Carcass lean meat percentage showed a positive correlation to shoulder and ham, but was negatively correlated to belly. In this study, in vivo primal cuts from atlas segmentation are used for genetic parameter calculations for the first time. Computed Tomography (CT) makes it possible to measure in vivo body or carcass composition. This will aid the selection response by measuring on the candidates themselves instead of using relatives. Primal cut proportion and composition measured in vivo by computed tomography and atlas segmentation show heritable variation comparable to previous post mortem studies.

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