Estimation of genetic parameters of conformation traits in Iranian Thoroughbred horses |
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| Authors: | J Bakhtiari G Heshmat |
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| Institution: | aAnimal Science Department, Abureyhan College of Agriculture, University of Tehran P.O. Box 11365-4117, Tehran, Iran;bAnimal Science Department, Islamic Azad University, Mahabad, Iran |
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| Abstract: | The aim of this study was to estimate the genetic parameters of conformation traits in Iranian Thoroughbred race horses. The data set included the conformation records of 607 Thoroughbred horses. In this study, 10 conformation traits were recorded. The effect of sex was significant for length of back line (P < 0.05), withers height (P < 0.05), circumference of front cannon (P < 0.001), and circumference of hind cannon (P < 0.001). The effect of age was significant for all traits (P < 0.01). The genetic parameters were estimated by the restricted maximum likelihood (REML) method using DFREML program. The heritability estimates were for head length 0.39, length of back line 0.41, length of shoulder 0.24, heart girth 0.49, chest width 0.22, withers height 0.38, front cannon height 0.27, circumference of front cannon 0.30, hind cannon height 0.29 and circumference of hind cannon 0.34. The estimates of genetic correlation ranged from 0.18 to 0.96 and those of phenotypic correlation varied from 0.16 to 0.83. |
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| Keywords: | Thoroughbred horses Conformation traits Heritability Phenotypic and genetic correlation |
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