Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia
Objective The objectives of the study were to evaluate reproductive performance and selection response through genetic trend of community-based breeding programs (CBBPs) of Bonga sheep. Methods Reproduction traits data were collected between 2012 and 2018 from Bonga sheep CBBPs. Phenotypic performan...
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Asian-Australasian Association of Animal Production Societies
2021-09-01
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doaj-0c4368a7b20944fc8ba202e0e178d24d2021-09-03T07:30:26ZengAsian-Australasian Association of Animal Production SocietiesAnimal Bioscience2765-01892765-02352021-09-013491451145910.5713/ajas.20.041324627Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in EthiopiaEbadu Areb0Tesfaye Getachew1MA Kirmani2Tegbaru G.silase3Aynalem Haile4 Bonga Agricultural Research Centre, PO Box 101 Bonga, Ethiopia International Centre for Agricultural Research in the Dry Area, PO Box 5689, Addis Ababa, Ethiopia Animal Breeding, Jimma University, PC Depot, Rehmatabad, Srinagar, Jammu and Kashmir, 190017, India Bonga Agricultural Research Centre, PO Box 101 Bonga, Ethiopia International Centre for Agricultural Research in the Dry Area, PO Box 5689, Addis Ababa, EthiopiaObjective The objectives of the study were to evaluate reproductive performance and selection response through genetic trend of community-based breeding programs (CBBPs) of Bonga sheep. Methods Reproduction traits data were collected between 2012 and 2018 from Bonga sheep CBBPs. Phenotypic performance was analyzed using the general linear model procedures of Statistical Analysis System. Genetic parameters were estimated by univariate animal model for age at first lambing (AFL) and repeatability models for lambing interval (LI), litter size (LS), and annual reproductive rate (ARR) traits using restricted maximum likelihood method of WOMBAT. For correlations bivariate animal model was used. Best model was chosen based on likelihood ratio test. The genetic trends were estimated by the weighted regression of the average breeding value of the animals on the year of birth/lambing. Results The overall least squares mean±standard error of AFL, LI, LS, and ARR were 375± 12.5, 284±9.9, 1.45±0.010, and 2.31±0.050, respectively. Direct heritability estimates for AFL, LI, LS, and ARR were 0.07±0.190, 0.06±0.120, 0.18±0.070, and 0.25±0.203, respectively. The low heritability for both AFL and LI showed that these traits respond little to selection programs but rather highly depend on animal management options. The annual genetic gains were −0.0281 days, −0.016 days, −0.0002 lambs and 0.0003 lambs for AFL, LI, LS, and ARR, respectively. Conclusion Implications of the result to future improvement programs were improving management of animals, conservation of prolific flocks and out scaling the CBBP to get better results.http://www.animbiosci.org/upload/pdf/ajas-20-0413.pdfbonga sheepgenetic parametergenetic trendrecordingreproductive performance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ebadu Areb Tesfaye Getachew MA Kirmani Tegbaru G.silase Aynalem Haile |
spellingShingle |
Ebadu Areb Tesfaye Getachew MA Kirmani Tegbaru G.silase Aynalem Haile Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia Animal Bioscience bonga sheep genetic parameter genetic trend recording reproductive performance |
author_facet |
Ebadu Areb Tesfaye Getachew MA Kirmani Tegbaru G.silase Aynalem Haile |
author_sort |
Ebadu Areb |
title |
Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia |
title_short |
Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia |
title_full |
Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia |
title_fullStr |
Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia |
title_full_unstemmed |
Estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of Bonga sheep in Ethiopia |
title_sort |
estimation of co-variance components, genetic parameters, and genetic trends of reproductive traits in community-based breeding program of bonga sheep in ethiopia |
publisher |
Asian-Australasian Association of Animal Production Societies |
series |
Animal Bioscience |
issn |
2765-0189 2765-0235 |
publishDate |
2021-09-01 |
description |
Objective The objectives of the study were to evaluate reproductive performance and selection response through genetic trend of community-based breeding programs (CBBPs) of Bonga sheep. Methods Reproduction traits data were collected between 2012 and 2018 from Bonga sheep CBBPs. Phenotypic performance was analyzed using the general linear model procedures of Statistical Analysis System. Genetic parameters were estimated by univariate animal model for age at first lambing (AFL) and repeatability models for lambing interval (LI), litter size (LS), and annual reproductive rate (ARR) traits using restricted maximum likelihood method of WOMBAT. For correlations bivariate animal model was used. Best model was chosen based on likelihood ratio test. The genetic trends were estimated by the weighted regression of the average breeding value of the animals on the year of birth/lambing. Results The overall least squares mean±standard error of AFL, LI, LS, and ARR were 375± 12.5, 284±9.9, 1.45±0.010, and 2.31±0.050, respectively. Direct heritability estimates for AFL, LI, LS, and ARR were 0.07±0.190, 0.06±0.120, 0.18±0.070, and 0.25±0.203, respectively. The low heritability for both AFL and LI showed that these traits respond little to selection programs but rather highly depend on animal management options. The annual genetic gains were −0.0281 days, −0.016 days, −0.0002 lambs and 0.0003 lambs for AFL, LI, LS, and ARR, respectively. Conclusion Implications of the result to future improvement programs were improving management of animals, conservation of prolific flocks and out scaling the CBBP to get better results. |
topic |
bonga sheep genetic parameter genetic trend recording reproductive performance |
url |
http://www.animbiosci.org/upload/pdf/ajas-20-0413.pdf |
work_keys_str_mv |
AT ebaduareb estimationofcovariancecomponentsgeneticparametersandgenetictrendsofreproductivetraitsincommunitybasedbreedingprogramofbongasheepinethiopia AT tesfayegetachew estimationofcovariancecomponentsgeneticparametersandgenetictrendsofreproductivetraitsincommunitybasedbreedingprogramofbongasheepinethiopia AT makirmani estimationofcovariancecomponentsgeneticparametersandgenetictrendsofreproductivetraitsincommunitybasedbreedingprogramofbongasheepinethiopia AT tegbarugsilase estimationofcovariancecomponentsgeneticparametersandgenetictrendsofreproductivetraitsincommunitybasedbreedingprogramofbongasheepinethiopia AT aynalemhaile estimationofcovariancecomponentsgeneticparametersandgenetictrendsofreproductivetraitsincommunitybasedbreedingprogramofbongasheepinethiopia |
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