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Bayesian estimation of the genetic relationship of survival traits from birth to yearling age with birth weight in Guilan sheep

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Abstract

This study aimed to estimate genetic parameters for cumulative survival traits from birth to yearling age and to estimate their genetic relationship with birth weight in Guilan sheep. The dataset used in this study comprised 41,037 survival records of Guilan lambs born from 496 sires and 10,256 dams, collected by the Guilan Province Agricultural Jihad Organization (in Rasht, Iran) during 1990–2013. The data included complete pedigree information; gender; year, month, and day of death; dam age; year, month, and day of birth; birth type; and birth weight. Cumulative survival traits from birth to yearling age were analyzed using threshold animal models via the Bayesian method. Also, linear-threshold animal models were used to study the genetic relationship between survival at different ages and birth weight. Direct heritability estimates of cumulative survival from birth to 60, 90, 180, 270, and 365 days of age were low and equal to 0.17, 0.16, 0.08, 0.04, and 0.04, respectively, and the corresponding maternal heritability estimates were 0.21, 0.18, 0.15, 0.08 and 0.08, respectively. Mean estimates of direct genetic correlations between birth weight and survival traits were medium (from 0.22 to 0.28). To improve the survival traits, more emphasis must be put on the amelioration of the non-genetic factors affecting it. Indirect selection based on traits high genetically correlated with survival could increase the survival rate in Guilan lambs.

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Acknowledgements

The authors thank the Agriculture Jihad Organization of Guilan Province in Iran for providing the data used in this study.

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MNF participated in the acquisition of data and statistical and genetic analyses of data and drafted the manuscript. NGH designed and conceived this study and contributed to the statistical and genetic analyses of data and writing of the manuscript. MG assisted with the preparation and interpretation of data. All authors read and approved the final manuscript.

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Correspondence to Navid Ghavi Hossein-Zadeh.

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Nadaf Fahmideh, M., Ghavi Hossein-Zadeh, N. & Golshani, M. Bayesian estimation of the genetic relationship of survival traits from birth to yearling age with birth weight in Guilan sheep. Trop Anim Health Prod 53, 134 (2021). https://doi.org/10.1007/s11250-021-02576-8

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