Estimation of genetic parameters for productive and reproductive traits in Esfahan native chickens
The main aim of this research was to estimate the genetic and phenotypic parameters for productive and reproductive traits of Esfahan native chickens. Traits included body weights at hatch (BW1), 8 weeks of age (BW8), 12 weeks of age (BW12), and at sexual maturity (WSM)], age at sex maturity (ASM), egg number (EN), average egg weight (AEW) in the first 12 weeks of production, and egg production intensity (Eint). Data were collected over 13 generations (during 1998 to 2011) at the breeding center of Esfahan native chickens in Iran. Genetic parameters were estimated by a (bi)-univariate animal model using the restricted maximum likelihood (REML) procedure. Heritability estimates for body weight at different ages varied from 0.14±0.01 to 0.42±0.01. Estimated heritability for reproductive traits ranged from 0.12±0.01 for Eint to 0.36±0.01 for AEW. Estimates of heritability values were moderate but BW1 and AEW showed higher heritability values. Genetic correlation among body weight traits varied from 0.20±0.03 to 0.82±0.02. Fairly small negative Genetic correlation between body weight traits and egg traits (EN and Eint) was small (in the range of -0.22±0.05 to -0.03±0.03), while they showed positive and moderate genetic correlation with the average egg weight, ranging from 0.11±0.04 to 0.39±0.02. There was a low negative genetic correlation (-0.09±0.02) between egg number and egg weight. Therefore, during simultaneous selection for growth and egg production, probable reduction in egg production due to low reduction in egg number may be compared by increases in egg weight.
the main aim of this research was to estimate the genetic and phenotypic parameters for productive and reproductive traits of esfahan native chickens. traits included body weights at hatch (bw1), 8 weeks of age (bw8), 12 weeks of age (bw12), and at sexual maturity (wsm)], age at sex maturity (asm), egg number (en), average egg weight (aew) in the first 12 weeks of production, and egg production...متن کامل
Bayesian inference of genetic parameters for reproductive traits in Sistani native cows using Gibbs sampling
This study was undertaken to estimate the genetic parameters for some reproduction traits in Sistani beef cattle. The data set consisted of 1489 records of number of insemination, calving, and insemination dates in different calving was used. Reproduction traits including calving interval (CI), gestation length (GL), days open (DO), calving to first service (CTFS), first service to conception (...متن کامل
estimation of genetic and phenotypic parameters for internal egg quality traits of azerbaijan native chickens
estimation of parameters and genetic trend of economic traits in native chickens of west azerbaijan province
the data of this study were collected by indigenous chicken breeding centers in the west azerbaijan for 11 generations. the (co) variance components, heritability's, correlations between traits and breeding values were estimated by multi-trait animal model using wombat software. the genetic trends of traits over 11 generations of selection, using average function of breeding values per gen...متن کامل
Genetic parameters estimation for preweaning traits and their relationship with reproductive, productive and morphological traits in alpaca.
The aim of this study was to estimate the genetic parameters for preweaning traits and their relationship with reproductive, productive and morphological traits in alpacas. The data were collected from 2001 to 2015 in the Pacomarca experimental farm. The data set contained data from 4330 females and 3788 males corresponding to 6396 and 1722 animals for Huacaya and Suri variants, respectively. T...متن کامل
Genetic parameters for productive life traits and reproductive efficiency traits at 6 years in Nellore cattle.
The objective of the present study was to estimate (co)variance components for length of productive life (LPL) and some alternative reproductive traits of 6-year-old Nellore cattle. The data set contained 57,410 records for age at first calving from Nellore females and was edited to remove animal records with uncertain paternity and cows with just one piece of calving information. Only animals ...متن کامل
دوره 1 شماره 2
صفحات 34- 38
تاریخ انتشار 2013-10-17
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