Ginja Mário M D, Silvestre António M, Ferreira António J A, Gonzalo-Orden José M, Orden Maria A, Melo-Pinto Pedro, Llorens-Pena Maria P, Colaço Jorge
Department of Veterinary Sciences-CITAB, University of Trás-os-Montes e Alto Douro, Portugal.
Acta Vet Hung. 2008 Sep;56(3):303-12. doi: 10.1556/AVet.56.2008.3.4.
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.
2002年至2006年间，采用宾夕法尼亚大学髋关节评估方法（PennHIP）对215只埃斯特雷拉山地犬（EMD）进行了检查。通过计算牵引指数（DI）来估计被动性髋关节松弛度（PHL）。系谱信息来自葡萄牙养犬俱乐部。使用线性动物模型估计遗传力和育种值。以每只动物最差的关节为参照，DI范围为0.15至1.12（0.55±0.19）。PHL在左右两侧相等，且雌性高于雄性（t检验中P值分别>0.05和<0.01）。估计的遗传力为0.83±0.11。1991年至2003年间出生的EMD中，PHL的平均育种值较为稳定，在2004年和2005年有所改善。数据证实，在犬髋关节发育不良患病率和严重程度较高的品种中，PHL较高。高遗传力表明，如果将PHL用作选择标准，该品种的DI可能会降低。DI育种值的早期良好演变可能与过去几年自愿进行的髋关节X线筛查增加以及随后将髋关节质量作为育种标准的引入有关。
