Volume 8, Issue 17 (1-2018)                   rap 2018, 8(17): 157-165 | Back to browse issues page

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Genetic and Non-Genetic Factors Affecting Longevity of Mehraban Sheep. rap. 2018; 8 (17) :157-165
URL: http://rap.sanru.ac.ir/article-1-857-en.html
Abstract:   (951 Views)
     Longevity records of 26991 Mehraban lambs born from 405 sires and 8114 dams which collected by the Agricultural Organization of Hamedan Province during 1981 to 2011 were used in this study. To determine the fixed effects fitted in statistical model (birth year, birth month, type of birth, age of dam, flock, lamb sex and lamb birth weight and their interactions), the GLM procedure of SAS software was used. Interaction between birth year-lamb sex and all fixed effects except for birth type, dam age and linear covariate variable of lamb birth weight was significant on longevity (P<0.001). Estimation of genetic parameters for longevity was obtained by Bayesian methods based on Gibbs sampling using with TM Software. All Bayesian analysis conducted with a total of 500,000 samples, 100,000 samples for burning period and thinning interval of 100. Average direct heritability and maternal heritability for longevity in various analyzes were 0.16 to 0.22 and 0.13 to 0.15, respectively. The average correlation between direct and maternal additive genetic effects was from -0.54 to -0.61According to low estimates of heritability for longevity, it can be concluded that in order to increase longevity, environmental conditions and management decisions should be improved.
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Type of Study: Research | Subject: Special
Received: 2018/01/10 | Revised: 2018/01/28 | Accepted: 2018/01/10 | Published: 2018/01/10

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