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This article in

  1. Vol. 85 No. 8, p. 1880-1884
     
    Received: Mar 14, 2007
    Accepted: Apr 16, 2007
    Published: December 8, 2014


    1 Corresponding author(s): asilvest@utad.pt
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doi:10.2527/jas.2007-0166

Comparison of estimates of hip dysplasia genetic parameters in Estrela Mountain Dog using linear and threshold models

  1. A. M. Silvestre*1,
  2. M. M. D. Ginja,
  3. A. J. A. Ferreira and
  4. J. Colaço*
  1. Department of Animal Science-CECAV,
    Department of Veterinary Science-CETAV, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal; and
    Departments of Clinic-CIISA, Faculty of Veterinary, 1300-477 Lisbon, Portugal

Abstract

Genetic parameters, breeding values, and genetic trends of hip dysplasia in Estrela Mountain Dogs were estimated using a linear model (LM) and a threshold model (TM). A database with 313 animals was used. Right and left hip joints were individually scored, according to the Fédération Cynologic Internationale grading rules of the canine hip dysplasia system, as normal (1), borderline (2), slight (3), moderate (4), and severe (5 and 6). The estimate of repeatability was lower in LM (0.86) than in TM (0.90). The same tendency was verified with the heritability because its estimate in LM was 0.38 and in TM was 0.43. However, these results did not establish any statistical differences between the models. The genetic trend of canine hip dysplasia for LM and TM showed a similarity in shape, but considerable individual differences were found in the EBV ranking lists. Therefore, the selection of breeding animals would not be the same with the 2 methodologies. To select the best method for genetic evaluation of hip dysplasia, further studies using more data and other dog breeds are required.

Copyright © 2007. Copyright 2007 Journal of Animal Science