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Genetic parameters for carcass dimensional measurements from Video Image Analysis and their association with conformation and fat class scores

Rius-Vilarrasa, E. and Bünger, L. and Brotherstone, S. and Macfarlane, J.M. and Lambe, N.R. and Matthews, K.R. and Haresign, W. and Roehe, R. (2010). Genetic parameters for carcass dimensional measurements from Video Image Analysis and their association with conformation and fat class scores. Livestock science. 128:1-3, 92-100
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Official URL: http://www.livestockscience.com/article/S1871-1413...

Abstract

Data on 630 crossbred lamb carcasses were used to estimate genetic parameters for a number of carcass measures, fitting a multivariate animal model using restricted maximum likelihood. Carcass measures included: cold carcass weight (CCW), EUROP conformation and fat class scores (MLC-CF), primal joint weights predicted using MLC-CF and several carcass linear and area measures obtained by Video Image Analysis (VIA-DM). Heritability estimates for subjective carcass traits (MLC-CF and primal joint weights predicted using MLC-CF) were low (0.05–0.17), whereas those for objective carcass traits (linear and area measurements on the carcass from VIA) were moderate to high (0.20–0.53). Phenotypic correlations between MLC-CF and VIA-DM were in general low (0.01–0.51) and genetic correlations were slightly higher (− 0.04–0.81), when interpreting their absolute value. The results suggest that selection for shorter carcasses (VIA lengths) will be associated with improved conformation but a reduction of the total CCW. Likewise there was a trend in the genetic correlations between conformation and carcass widths which indicated that conformation could also be improved by selection for wider carcasses as measured by VIA which in turn will also imply an increase in CCW. The genetic correlations between VIA-DM and fat class score were only significantly different from zero for the VIA measurement for the leg area (rg = − 0.73). Length traits were highly correlated with each other, with an average genetic correlation of 0.84. Positive genetic correlations (0.47–0.85) were found between widths measured on the shoulders and chest with hind leg widths. The areas measured on the carcass were moderately to highly correlated with each other (0.54–0.90). In general, genetic correlations which were found to be significant between areas, lengths and widths were moderate to high and positive. Phenotypic and genetic correlations along with heritabilities of the VIA-DM from crossbred lambs, suggest that using this VIA dimensional information in the evaluation of purebred terminal sire breeds is likely to improve conformation on crossbred lambs.

Authors/Creators:Rius-Vilarrasa, E. and Bünger, L. and Brotherstone, S. and Macfarlane, J.M. and Lambe, N.R. and Matthews, K.R. and Haresign, W. and Roehe, R.
Title:Genetic parameters for carcass dimensional measurements from Video Image Analysis and their association with conformation and fat class scores
Series/Journal:Livestock science (1878-0490)
Year of publishing :2010
Volume:128
Number:1-3
Page range:92-100
Publisher:Elsevier
ISSN:1878-0490
Language:English
Additional Information:Originally published by Elsevier doi:10.1016/j.livsci.2009.11.004
Publication Type:Journal article
Refereed:Yes
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Animal production > Animal breeding
Keywords:Video Image Analysis, conformation, fat, dimensional measurements, heritability
URN:NBN:urn:nbn:se:slu:epsilon-8-456
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-456
ID Code:4585
Department:(VH) > Dept. of Animal Breeding and Genetics
Deposited By: Linda Åström
Deposited On:22 Mar 2010 00:00
Metadata Last Modified:02 Dec 2014 10:32

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