Two hundred and fifteen Estrela Mountain Dogs (EMD) were examined using the PennHIP method between 2002 and 2006. Passive hip laxity (PHL) was estimated calculating the distraction index (DI). Pedigree information was obtained from the Portuguese Kennel Club. The heritability and breeding values were estimated using the linear Animal Model. The DI, using as reference the worst joint of each animal, ranged from 0.15 to 1.12 (0.55 +/- 0.19). The PHL was equal in right and left sides, and was higher in females than in males (P > 0.05 and P <0.01 in the t-test, respectively). The estimated heritability was 0.83 +/- 0.11. The mean breeding values for PHL were stable in EMD born between 1991 and 2003, and showed an improvement in 2004 and 2005. The data confirm high PHL in breeds with high prevalence and severity of canine hip dysplasia. The high heritability indicates that the DI could be reduced in the breed if PHL were used as a selection criterion. The early favourable evolution of DI breeding values could be related with the increase of voluntary radiographic hip screening in the last years, and the subsequent introduction of hip quality as a breeding criterion.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a new approach to deriving statistically
optimal weights for weighted subspace fitting (WSF) algorithms. The
approach uses a formula called a “subspace perturbation
expansion,” which shows how the subspaces of a matrix change when
the matrix elements are perturbed. The perturbation expansion is used to
derive an optimal WSF algorithm for estimating directions of arrival in
array signal processing
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on; 06/1998
[Show abstract][Hide abstract] ABSTRACT: To determine the reliability of early passive hip laxity examination in predicting moderate and severe hip dysplasia.
The passive hip laxity of 104 Estrela Mountain dogs was evaluated using the Ortolani method, conventional hip-extended radiography and the PennHIP method, when the animals were between four and 12 months of age. After the age of one, dogs were re-examined for hip dysplasia using the Fédération Cynologique Internationale scoring system. The passive hip laxity results were subsequently compared with the Fédération Cynologique Internationale scores for sensitivity, specificity, positive predictive value, negative predictive value and accuracy.
The PennHIP method achieved the best results in specificity (93 per cent), positive predictive value (91 per cent) and accuracy (88 per cent), and the Ortolani method was the best in sensitivity (92 per cent) and negative predictive value (92 per cent).
The Fédération Cynologique Internationale grades D and E can be predicted with confidence even before animals are one year old.
Journal of Small Animal Practice 09/2008; 49(12):641-6. DOI:10.1111/j.1748-5827.2008.00629.x · 1.09 Impact Factor
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