ESTIMATION OF NON-GENETIC AND GENETIC EFFECTS FOR SURVIVAL TRAIT IN ZANDI SHEEP

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Vojdan Hassan Kiyadeh Ali; ROKOUEI MOHAMMAD; DASHAB GHOLAM REZA; Seyedalian Seyed Ahmad Reza; FARAJI AROUGH HADI

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Journal: Journal of Animal Production Year:2019 | Volume:21 | Issue:2 Page(s): 181-192

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Title

ESTIMATION OF NON-GENETIC AND GENETIC EFFECTS FOR SURVIVAL TRAIT IN ZANDI SHEEP

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Keywords

CENSORED DATAQ2

CULLING RISKQ1

GENETIC PARAMETERQ1

GIBBS SAMPLINGQ2

HERITABILITYQ1

ZANDI SHEEPQ2

Abstract

This research was conducted with the aim of estimation of environmental factors affecting survival and estimation of the GENETIC PARAMETERs for survival trait from 1 to the last recording date in ZANDI SHEEP. The survival records of 9558 ZANDI SHEEP from 273 rams and 2328 ewes collected by Animal Breeding Center of Iran during the 25 years (1987 to 2011) were used in this analysis. The effective factors on survival and CULLING RISK were estimated by Survival and cmprsk packages. Estimation of variance components was performed using exponential distribution for CENSORED DATA by fitting a model with additive genetic effect (model 1) and joint additive genetic and maternal permanent environmental effects (model 2) under Bayesian approach via GIBBS SAMPLING. A total of 1000000 samples with a burn-in of 100000 and a sampling interval of 75 were generated to estimate the posterior distribution of variance components. The results showed that year, month, birth weight, type birth, sex (P <0. 001) and dam age (P <0. 01) had significant effect on survival trait. The direct HERITABILITY of survival trait using models 1 and 2 was 0. 184 (0. 136-0. 264) and 0. 162 (0. 120-0. 202), respectively. The proportion of permanent variance to phenotypic variance was 0. 046 (0. 063-0. 031). According to the results of this study, genetic improvement of survival trait in Zandi lamb is possible by genetic selection and the CULLING RISK reduction is effective via management of environmental factors.

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APA: Copy

Vojdan Hassan Kiyadeh, Ali, ROKOUEI, MOHAMMAD, DASHAB, GHOLAM REZA, Seyedalian, Seyed Ahmad Reza, & FARAJI AROUGH, HADI. (2019). ESTIMATION OF NON-GENETIC AND GENETIC EFFECTS FOR SURVIVAL TRAIT IN ZANDI SHEEP. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), 21(2 ), 181-192. SID. https://sid.ir/paper/209006/en

Vancouver: Copy

Vojdan Hassan Kiyadeh Ali, ROKOUEI MOHAMMAD, DASHAB GHOLAM REZA, Seyedalian Seyed Ahmad Reza, FARAJI AROUGH HADI. ESTIMATION OF NON-GENETIC AND GENETIC EFFECTS FOR SURVIVAL TRAIT IN ZANDI SHEEP. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE)[Internet]. 2019;21(2 ):181-192. Available from: https://sid.ir/paper/209006/en

IEEE: Copy

Ali Vojdan Hassan Kiyadeh, MOHAMMAD ROKOUEI, GHOLAM REZA DASHAB, Seyed Ahmad Reza Seyedalian, and HADI FARAJI AROUGH, “ESTIMATION OF NON-GENETIC AND GENETIC EFFECTS FOR SURVIVAL TRAIT IN ZANDI SHEEP,” JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), vol. 21, no. 2 , pp. 181–192, 2019, [Online]. Available: https://sid.ir/paper/209006/en

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