Covariance components and genetic parameter estimation for 18 month weight in Nguni and Tuli cattle of Zimbabwe
Journal Title: Agricultural Advances - Year 2013, Vol 2, Issue 3
Abstract
An animal model wasapplied to estimate variance components and heritability estimates from weightat 18-months (18-mo) pedigree records of two experimental herds of Nguni and Tuli cattle maintained on rangeat Matopos Research Station. The fixed effects included were of year of birth,sex and age of dam. Random effects were direct and maternal genetic of theanimal and dam with genetic covariance of direct and maternal effects, maternalpermanent environment, and random residual. Estimates of direct heritabilitywere 0.36 ±0.001 and 0.13±0.005 for Nguni and Tuli cattle, respectively. Thematernal heritability was higher for Tuli cattle, 0.18 as compared to 0.02 for Nguni cattle. Estimates ofmaternal permanent environmental variance as a proportion of phenotypicvariance were less than 1% in both Nguni and Tuli cattle. The direct-maternalgenetic correlations were small and negative for Nguni cattle, and small andpositive for Tuli cattle. Permanent environmental effects were found not to beimportant for 18-mo in both cattle breeds studied. The genetic variance is highin Nguni cattle that response to selection is expected to be high.
Authors and Affiliations
N. Assan*| Matopos Research Station, Bag K5137, Bulawayo, Zimbabwe.
Keywords
Related Articles
- EP ID EP512
- DOI -
- Views 516
- Downloads 24
Effects of trickle irrigation system from southern Iran district Chabahar free zone
This research was carried out on steep slope area planted with trees in different elevation terraces. The experiments were conducted at the experimental site at the Chabahar Free Zone. One major disadvantage of trickle...
Prospects for indigenous chickens genetic improvement and conservation in Zimbabwe
The multitude functions of indigenous chickens, which include the provision of high quality protein meat and eggs, cash through sales and socio-cultural roles, cannot be underestimated. Indigenous chickens is one of th...
Allelopathic effect of pistacia khinjuk leaf extracts on chenopodium album, physalis alkekengi and amaranthus retroflexu
A weed is a term applied to any plant considered as one major problem in farm fields and gardens. Weeds cause serious damages to farmers per year, bringing about heavy losses in farm and garden yield. Thus, in order to...
Possibility of using electronic commerce in Iran's fertilizer and pesticides market
In this article, according to statistics published in 2014 Iran IDI's report, Iran's electronic commerce's situation and advance's procedure in the future are studied. Then fertilizer and pesticides market's available...
Influence of temperature humidity index on skin temperature of West African Dwarf goats raised in Nigeria
The influence oftemperature humidity index (THI) on skin temperature of West African Dwarf(WAD) goats was evaluated. Based on the recordings of farm ambient temperatureand relative humidity, the study was conducted dur...