Genetic parameter estimation and model selection for hot carcass weight in matebele goat
Journal Title: Scientific Journal of Biological Sciences - Year 2012, Vol 1, Issue 1
Abstract
Genetic parameter estimation for simple carcass traits has been confined to the improved goat breeds worldwide unlike in the unimproved breeds in developing countries where goats are numerous. Variance components for additive direct, additive maternal, permanent environmental maternal effects, the covariance between additive direct and maternal effects were estimated by restricted maximum likelihood, fitting five animal models from 2341 ( 1359 males; 982 females) hot carcass weight pedigree records collected over a period of 13 years (1984- 1997) of indigenous Matebele goat of Zimbabwe. All investigated models included a random direct genetic effect, but different combinations of random maternal genetic and permanent environmental maternal effects as well as direct-maternal genetic covariance. The analytical models included fixed effects of sex, age at slaughter and year of slaughter. The direct heritability (h2a) ranged from 0.14 to 0.26 when the maternal genetic effects were included in the model, whereas h2a estimate was 0.26 when maternal effects were excluded. The maternal heritability (h2m) was 0.00 when only maternal genetic effects were included in the model and were 0.05 and 0.10 when the permanent environmental effect of the dam was added. The permanent environmental effect of the dam was negligible. A positive covariances between direct and maternal genetic effects (σ2am ) was observed when maternal genetic effects and permanent environmental maternal effects were accounted for in the model. A simple animal model with direct additive genetic effects as the only random effects other than the residuals was the best model for genetic evaluation of hot carcass weight in indigenous Matebele goat.
Authors and Affiliations
N. Assan| Department of Agriculture, Faculty of Science, Zimbabwe Open University, Bulawayo, Zimbabwe
Correlation of body weight and other morphometric measurements in Albino rats (Rattus Norvegicus)
Relationship between body weight and other morphometric measurements in Albino rats (Rattus norvegicus) was investigated. Morphometric data such as body weight (BDYWT), tail length (TL), body length from nose to anus (BL...
Impact of bacterial and viral infections for barrennes of productive animals
Historically the operational stages of artificial insemination of animals. The influence of some viral and bacterial infections on the reproductive systems in male animals has led to barreness.
Reproductive biology and histological characteristics of female little tunny Euthynnus alletteratus (Rafinesque, 1810) caught on continental shelf of Côte d’Ivoire
Some females little tunny (n=395) caught in gillnets and measuring in size from 35 to 76 cm FL (centimetre Fork Length) were sampled from January to December 2004 to study some biological features (length-weight relation...
Antimicrobial activity and biosynthesis of nanoparticles by endophytic bacterium inhabiting Coffee arabica L.
The interface between endophytes and nanomaterials is a relatively new and unexplored area the present study evaluates screening of bacterial endophytes from surfaced sterilized leaf and stem segments of agro economical...
Evaluation of the response of Clibanarius africanus (Decapoda: Paguridae) to crude oil in static bioassay
The acute toxicity of Nigeria Bonny light crude oil against hermit crab, Cliabanarius africanus of a tidal creek, Eastern Obolo, Akwa Ibom State, Nigeria was investigated in the laboratory under static bioassay. The...