ESTIMATION OF GENETIC PARAMETERS OF REPRODUCTIVE TRAITS OF BAKHTIARI BREED OF SHEEP BY HENDERSON’S III AND DF-REML METHODS

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EDRIS M.A.; VATANKHAH M.

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Journal: AGRICULTURAL RESEARCH Year:2004 | Volume:4 | Issue:1 Page(s): 1-13

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Title

ESTIMATION OF GENETIC PARAMETERS OF REPRODUCTIVE TRAITS OF BAKHTIARI BREED OF SHEEP BY HENDERSON’S III AND DF-REML METHODS

Author(s)

EDRIS M.A. | VATANKHAH M. | Issue Writer Certificate

Keywords

BAKHTIARI SHEEPQ3

GENETIC PARAMETERSQ4

REMLQ4

HENDERSON’S III METHODQ4

REPRODUCTIVE TRAITSQ4

Abstract

In this study 1874 reproductive records from mating of 682 ewes with 150 rams during 1991 to 1998 in the station of Genetic Improvement of BAKHTIARI SHEEP breed were used to estimate the GENETIC PARAMETERS of REPRODUCTIVE TRAITS by Henderson’s III and DF-REML methods. The effect of environmental factors such as mating year, age of ewe at mating and mating time were significant (p<0.01, 0.05) on most of REPRODUCTIVE TRAITS. Estimation of GENETIC PARAMETERS for considered REPRODUCTIVE TRAITS with Henderson’s method III were: paternal half-sib heritabilities from 0.14±0.05 to 0.28±0.07, maternal half-sib heritabilities from 0.13±0.08 to 0.44±0.10 and repeatabilities from 0.05±0.03 to 0.18±0.03. Estimation of heritabilities with Derivative Free Restricted Maximum Likelihood (DF-REML) procedures was: direct heritabilities from zero to 0.11±0.03 and repeatabilities from 0.03 to 0.20, also phenotypic and genetic correlations among most of the considered traits were positive and from 0.47±0.16 to 0.91±0.02. According to the theory of Henderson’s method III for estimation of parameters, in the considered population, it is assumed that, animals are unrelated and this method does not account for selection and nonrandom mating while these assumptions do not meet in commercial herd such as the herd under study. These assumptions are considered in DF-REML procedures. Then, the estimation of GENETIC PARAMETERS by DF-REML is superior to Henderson’s method III except for repeatability coefficients, which there were a negligible difference between two methods of estimation. It could be concluded that in to increases reproductive rate, improvement of environmental factors is necessary. It seems that selection within breed by itself can not make any major improvement in efficiency of REPRODUCTIVE TRAITS.

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APA: Copy

EDRIS, M.A., & VATANKHAH, M.. (2004). ESTIMATION OF GENETIC PARAMETERS OF REPRODUCTIVE TRAITS OF BAKHTIARI BREED OF SHEEP BY HENDERSON’S III AND DF-REML METHODS. AGRICULTURAL RESEARCH, 4(1), 1-13. SID. https://sid.ir/paper/84830/en

Vancouver: Copy

EDRIS M.A., VATANKHAH M.. ESTIMATION OF GENETIC PARAMETERS OF REPRODUCTIVE TRAITS OF BAKHTIARI BREED OF SHEEP BY HENDERSON’S III AND DF-REML METHODS. AGRICULTURAL RESEARCH[Internet]. 2004;4(1):1-13. Available from: https://sid.ir/paper/84830/en

IEEE: Copy

M.A. EDRIS, and M. VATANKHAH, “ESTIMATION OF GENETIC PARAMETERS OF REPRODUCTIVE TRAITS OF BAKHTIARI BREED OF SHEEP BY HENDERSON’S III AND DF-REML METHODS,” AGRICULTURAL RESEARCH, vol. 4, no. 1, pp. 1–13, 2004, [Online]. Available: https://sid.ir/paper/84830/en

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