Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows

Background: Fertility and health traits, other than production traits, have a major role in the profitability of dairy cattle. Therefore, it seems necessary to include the afore mentioned traits in breeding programs. Hence, genetic parameters are needed to establish breeding plans. Objective: To est...

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Autores principales:	Arash Chegini, Abdol Ahad Shadparvar, Navid Ghavi Hossein-Zadeh, Behrooz Mohammad-Nazari
Formato:	article
Lenguaje:	EN
Publicado:	Universidad de Antioquia 2019
Materias:	breeding goal correlation fertility heritability wood’s gamma function Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/56dc6b3c1eea4c88a8644d9dbccd7b0c
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spelling	oai:doaj.org-article:56dc6b3c1eea4c88a8644d9dbccd7b0c2021-12-01T18:59:22ZGenetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows2256-295810.17533/udea.rccp.v32n2a01https://doaj.org/article/56dc6b3c1eea4c88a8644d9dbccd7b0c2019-05-01T00:00:00Zhttps://revistas.udea.edu.co/index.php/rccp/article/view/334521https://doaj.org/toc/2256-2958Background: Fertility and health traits, other than production traits, have a major role in the profitability of dairy cattle. Therefore, it seems necessary to include the afore mentioned traits in breeding programs. Hence, genetic parameters are needed to establish breeding plans. Objective: To estimate heritabilities as well as genetic and environmental relationships among total milk yield (TMY), persistency of milk yield (PMY), mean somatic cell count (SCC), mean loge somatic cell count (LnSCC), standard deviation of somatic cell count (stdSCC), and calving interval (CI) using two-trait and multi-trait analyses in Iranian Holstein. Methods: The dataset consisted of 25,883 first lactation records collected from 2002 to 2007 in 97 Holstein dairy herds in Iran. Four criteria of persistency of milk yield (PMY) were calculated using the Wood's gamma function. The WOMBAT1.0 software was used to estimate the (co)variance components using the Average Information Restricted Maximum Likelihood algorithm. Results: Total milk yield (TMY) resulted in the highest heritability estimate (0.29). Heritability estimates for different criteria of persistency of milk yield (PMY) ranged from 0.05 to 0.10. The unfavorable genetic correlation between TMY and calving interval (CI) was 0.71, while that of PMY with CI was 0.46. The estimated environmental correlations were lower than the genetic correlations for all traits, but the trends were generally similar. Conclusion: The results indicate that including PMY in the breeding goals could increase TMY and CI, and decrease somatic cell count (SCC).Arash CheginiAbdol Ahad ShadparvarNavid Ghavi Hossein-ZadehBehrooz Mohammad-NazariUniversidad de Antioquiaarticlebreeding goalcorrelationfertilityheritabilitywood’s gamma functionAnimal cultureSF1-1100ENRevista Colombiana de Ciencias Pecuarias, Vol 32, Iss 2, Pp 81-89 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	breeding goal correlation fertility heritability wood’s gamma function Animal culture SF1-1100
spellingShingle	breeding goal correlation fertility heritability wood’s gamma function Animal culture SF1-1100 Arash Chegini Abdol Ahad Shadparvar Navid Ghavi Hossein-Zadeh Behrooz Mohammad-Nazari Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows
description	Background: Fertility and health traits, other than production traits, have a major role in the profitability of dairy cattle. Therefore, it seems necessary to include the afore mentioned traits in breeding programs. Hence, genetic parameters are needed to establish breeding plans. Objective: To estimate heritabilities as well as genetic and environmental relationships among total milk yield (TMY), persistency of milk yield (PMY), mean somatic cell count (SCC), mean loge somatic cell count (LnSCC), standard deviation of somatic cell count (stdSCC), and calving interval (CI) using two-trait and multi-trait analyses in Iranian Holstein. Methods: The dataset consisted of 25,883 first lactation records collected from 2002 to 2007 in 97 Holstein dairy herds in Iran. Four criteria of persistency of milk yield (PMY) were calculated using the Wood's gamma function. The WOMBAT1.0 software was used to estimate the (co)variance components using the Average Information Restricted Maximum Likelihood algorithm. Results: Total milk yield (TMY) resulted in the highest heritability estimate (0.29). Heritability estimates for different criteria of persistency of milk yield (PMY) ranged from 0.05 to 0.10. The unfavorable genetic correlation between TMY and calving interval (CI) was 0.71, while that of PMY with CI was 0.46. The estimated environmental correlations were lower than the genetic correlations for all traits, but the trends were generally similar. Conclusion: The results indicate that including PMY in the breeding goals could increase TMY and CI, and decrease somatic cell count (SCC).
format	article
author	Arash Chegini Abdol Ahad Shadparvar Navid Ghavi Hossein-Zadeh Behrooz Mohammad-Nazari
author_facet	Arash Chegini Abdol Ahad Shadparvar Navid Ghavi Hossein-Zadeh Behrooz Mohammad-Nazari
author_sort	Arash Chegini
title	Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows
title_short	Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows
title_full	Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows
title_fullStr	Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows
title_full_unstemmed	Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows
title_sort	genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in holstein cows
publisher	Universidad de Antioquia
publishDate	2019
url	https://doaj.org/article/56dc6b3c1eea4c88a8644d9dbccd7b0c
work_keys_str_mv	AT arashchegini geneticandenvironmentalrelationshipsamongmilkyieldpersistencyofmilkyieldsomaticcellcountandcalvingintervalinholsteincows AT abdolahadshadparvar geneticandenvironmentalrelationshipsamongmilkyieldpersistencyofmilkyieldsomaticcellcountandcalvingintervalinholsteincows AT navidghavihosseinzadeh geneticandenvironmentalrelationshipsamongmilkyieldpersistencyofmilkyieldsomaticcellcountandcalvingintervalinholsteincows AT behroozmohammadnazari geneticandenvironmentalrelationshipsamongmilkyieldpersistencyofmilkyieldsomaticcellcountandcalvingintervalinholsteincows
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Genetic and environmental relationships among milk yield, persistency of milk yield, somatic cell count and calving interval in Holstein cows

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