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Information Journal Paper

Title

ESTIMATION OF (CO)VARIANCE COMPONENETS AND GENETIC PARAMETERS OF CLEAN FLEECE WEIGHT AND LITTER SIZE IN LORI-BAKHTIARI EWES

Pages

  68-76

Keywords

(CO) VARIANCE COMPONENTSQ4

Abstract

 In this study 4136 records of ewe CLEAN FLEECE WEIGHT and 3135 records of LITTER SIZE collected during the period 1990-2000 from a flock at Rearing and Breeding of Lori-Bakhtiari sheep Station in Shahre-Kord were used to estimate (Co)variance components and GENETIC PARAMETERS of ewe CLEAN FLEECE WEIGHT and LITTER SIZE. (Co)Variance components and GENETIC PARAMETERS were estimated using Derivative Free Restricted Maximum Likelihood (DFREML) with univariate and bivariate animal models including fixed effects of year, ewe age and regression coefficient of ewe body weight, and random effects of additive genotype of ewe, permanent environment and residuals. Least-squares means (±s.e.) of ewe CLEAN FLEECE WEIGHT and LITTER SIZE were 1.95±0.01kg and 1.16±0.006 head, respectively. Effects of year and ewe age on traits under study were highly significant (p<0.001). Estimation of variance components from univariate were the same as bivariate analysis. Estimation of genetic (co) variance components were 0.108±0.011 and 0.016±0.005 for ewe CLEAN FLEECE WEIGHT and LITTER SIZE and - 0.002±0.005 for genetic covariance between them. Estimation of GENETIC PARAMETERS for ewe CLEAN FLEECE WEIGHT and LITTER SIZE were respectively 0.56±0.04 and 0.13±0.04 for heritability, 0.64 and 0.28 for repeatability and - 0.04±0.04 for genetic correlation between two traits. The results of this study showed that the rate of response to selection for LITTER SIZE will be slow, while selection for ewe CLEAN FLEECE WEIGHT resulting considerable progress for this trait without any negative effect on LITTER SIZE.  

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    APA: Copy

    VATANKHAH, M., TALEBI, M.A., & EDRIS, M.A.. (2005). ESTIMATION OF (CO)VARIANCE COMPONENETS AND GENETIC PARAMETERS OF CLEAN FLEECE WEIGHT AND LITTER SIZE IN LORI-BAKHTIARI EWES. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 12(SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE)), 68-76. SID. https://sid.ir/paper/9448/en

    Vancouver: Copy

    VATANKHAH M., TALEBI M.A., EDRIS M.A.. ESTIMATION OF (CO)VARIANCE COMPONENETS AND GENETIC PARAMETERS OF CLEAN FLEECE WEIGHT AND LITTER SIZE IN LORI-BAKHTIARI EWES. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2005;12(SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE)):68-76. Available from: https://sid.ir/paper/9448/en

    IEEE: Copy

    M. VATANKHAH, M.A. TALEBI, and M.A. EDRIS, “ESTIMATION OF (CO)VARIANCE COMPONENETS AND GENETIC PARAMETERS OF CLEAN FLEECE WEIGHT AND LITTER SIZE IN LORI-BAKHTIARI EWES,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 12, no. SUPPLEMENT (SPECIAL ISSUE ANIMAL SCIENCE), pp. 68–76, 2005, [Online]. Available: https://sid.ir/paper/9448/en

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