Record Details

Estimates Of Genetic Parameters, Genetic Trends And Optimizing Community Based Breeding Of Abera Sheep Breed, Ethiopia

CGSpace

View Archive Info
 
 
Field Value
 
Title Estimates Of Genetic Parameters, Genetic Trends And Optimizing Community Based Breeding Of Abera Sheep Breed, Ethiopia
 
Creator Alemayehu, Amelmal
 
Subject genetic parameters
goal 1 no poverty
genetic trends
estimated breeding value
growth traits
poverty reduction, livelihoods and jobs
community based sheep breeding
optimize selection intensity
source of breeding ewe
 
Description Three combined investigations were carried out with the objectives of 1) estimating the genetic
parameters and genetic trends for growth traits of Abera sheep in six breeder cooperatives
established under community-based breeding programs (CBBPs); 2) participatory basis of
comparison of breeding objectives and selection criteria of farmers from CBBPs and farmers
from traditional sheep breeding practices; and 3) optimization of CBBPs of Abera sheep targets
to increase genetic gain and economical profits with nine different breeding alternatives,
considering number of candidate breeding ram and male to female sex ratio. A total of 2901
birth weight (BWT) 2626 weaning weight (WWT), 2261 six-months weight (SMWT) and 1603
yearling weights (YWT) records were collected between the year 2013 and 2019 were used for
the analysis. General linear model consisting of the fixed effects of sex, breeder cooperative, season and birth type was used to analyze growth traits. As sheep in each CBBP is bred with by
its own breeding ram, variance components and resulting genetic parameters were estimated,
within each breeder cooperative, using univariate animal model based on restricted maximum
likelihood method using WOMBAT software. Multivariate analysis was also employed to
compute correlation estimates among growth traits. Six different models, by including or
excluding maternal additive genetic effects, maternal permanent environmental effect, and
covariance between direct-maternal additive genetic effects were fitted and the most appropriate
model was selected based on a Log-Likelihood Ratio Test (LRT) and Akaike’s Information
Criterion (AIC) were then used to select the most appropriate univariate model for each trait,
which was finally used to estimate the studied parameters. Results indicated that all fixed effects
influenced (P
 
Date 2023-01-20T17:46:06Z
2023-01-20T17:46:06Z
 
Type Thesis
 
Identifier Amelmal Alemayehu. (19/12/2022). Estimates Of Genetic Parameters, Genetic Trends And Optimizing Community Based Breeding Of Abera Sheep Breed, Ethiopia.
https://hdl.handle.net/10568/127703
 
Language en
 
Rights CC-BY-SA-4.0
Open Access
 
Format application/pdf