Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis

Background: Romosinuano cattle breed in Mexico has endured isolation and it is necessary to characterize it in order to facilitate sustainable genetic management. Objective: To assess the evolution of the structure and genetic diversity of the Romosinuano breed in Mexico, through pedigree analysis....

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Autores principales:	Rafael Núñez-Domínguez, Ricardo E. Martínez-Rocha, Jorge A. Hidalgo-Moreno, Rodolfo Ramírez-Valverde, José G. García-Muñiz
Formato:	article
Lenguaje:	EN
Publicado:	Universidad de Antioquia 2020
Materias:	effective population size gene flow genetic diversity genetic drift generation interval inbreeding pedigree population structure probability of gene origin romosinuano cattle Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/6918cc1c40f44014b4721833a49c7f31
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spelling	oai:doaj.org-article:6918cc1c40f44014b4721833a49c7f312021-12-01T15:44:00ZEvaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis2256-295810.17533/udea.rccp.v32n4a05https://doaj.org/article/6918cc1c40f44014b4721833a49c7f312020-01-01T00:00:00Zhttps://revistas.udea.edu.co/index.php/rccp/article/view/338067https://doaj.org/toc/2256-2958Background: Romosinuano cattle breed in Mexico has endured isolation and it is necessary to characterize it in order to facilitate sustainable genetic management. Objective: To assess the evolution of the structure and genetic diversity of the Romosinuano breed in Mexico, through pedigree analysis. Methods: Pedigree data was obtained from Asociación Mexicana de Criadores de Ganado Romosinuano y Lechero Tropical (AMCROLET). The ENDOG program (4.8 version) was used to analyze two datasets, one that includes upgrading from F1 animals (UP) and the other with only straight-bred cattle (SP). For both datasets, three reference populations were defined: 1998-2003 (RP1), 2004-2009 (RP2), and 2010-2017 (RP3). The pedigree included 3,432 animals in UP and 1,518 in SP. Demographic parameters were: Generation interval (GI), equivalent number of generations (EG), pedigree completeness index (PCI), and gene flow among herds. Genetic parameters were: Inbreeding (F) and average relatedness (AR) coefficients, effective population size (Nec), effective number of founders and ancestors, and number of founder genome equivalents. Results: The GI varied from 6.10 to 6.54 for UP, and from 6.47 to 7.16 yr for SP. The EG of the UP and SP improved >63% from RP1 to RP3. The PCI increased over time. No nucleus or isolated herds were found. For RP3, F and AR reached 2.08 and 5.12% in the UP, and 2.55 and 5.94% in the SP. For RP3, Nec was 57 in the UP and 45 in the SP. Genetic diversity losses were attributed mainly (>66%) to genetic drift, except for RP3 in the SP (44%). Conclusions: A reduction of the genetic diversity has been occurring after the Romosinuano breed association was established in Mexico, and this is mainly due to random loss of genes.Rafael Núñez-DomínguezRicardo E. Martínez-RochaJorge A. Hidalgo-MorenoRodolfo Ramírez-ValverdeJosé G. García-MuñizUniversidad de Antioquiaarticleeffective population sizegene flowgenetic diversitygenetic driftgeneration intervalinbreedingpedigreepopulation structureprobability of gene originromosinuano cattleAnimal cultureSF1-1100ENRevista Colombiana de Ciencias Pecuarias, Vol 33, Iss 1, Pp 44-59 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	effective population size gene flow genetic diversity genetic drift generation interval inbreeding pedigree population structure probability of gene origin romosinuano cattle Animal culture SF1-1100
spellingShingle	effective population size gene flow genetic diversity genetic drift generation interval inbreeding pedigree population structure probability of gene origin romosinuano cattle Animal culture SF1-1100 Rafael Núñez-Domínguez Ricardo E. Martínez-Rocha Jorge A. Hidalgo-Moreno Rodolfo Ramírez-Valverde José G. García-Muñiz Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis
description	Background: Romosinuano cattle breed in Mexico has endured isolation and it is necessary to characterize it in order to facilitate sustainable genetic management. Objective: To assess the evolution of the structure and genetic diversity of the Romosinuano breed in Mexico, through pedigree analysis. Methods: Pedigree data was obtained from Asociación Mexicana de Criadores de Ganado Romosinuano y Lechero Tropical (AMCROLET). The ENDOG program (4.8 version) was used to analyze two datasets, one that includes upgrading from F1 animals (UP) and the other with only straight-bred cattle (SP). For both datasets, three reference populations were defined: 1998-2003 (RP1), 2004-2009 (RP2), and 2010-2017 (RP3). The pedigree included 3,432 animals in UP and 1,518 in SP. Demographic parameters were: Generation interval (GI), equivalent number of generations (EG), pedigree completeness index (PCI), and gene flow among herds. Genetic parameters were: Inbreeding (F) and average relatedness (AR) coefficients, effective population size (Nec), effective number of founders and ancestors, and number of founder genome equivalents. Results: The GI varied from 6.10 to 6.54 for UP, and from 6.47 to 7.16 yr for SP. The EG of the UP and SP improved >63% from RP1 to RP3. The PCI increased over time. No nucleus or isolated herds were found. For RP3, F and AR reached 2.08 and 5.12% in the UP, and 2.55 and 5.94% in the SP. For RP3, Nec was 57 in the UP and 45 in the SP. Genetic diversity losses were attributed mainly (>66%) to genetic drift, except for RP3 in the SP (44%). Conclusions: A reduction of the genetic diversity has been occurring after the Romosinuano breed association was established in Mexico, and this is mainly due to random loss of genes.
format	article
author	Rafael Núñez-Domínguez Ricardo E. Martínez-Rocha Jorge A. Hidalgo-Moreno Rodolfo Ramírez-Valverde José G. García-Muñiz
author_facet	Rafael Núñez-Domínguez Ricardo E. Martínez-Rocha Jorge A. Hidalgo-Moreno Rodolfo Ramírez-Valverde José G. García-Muñiz
author_sort	Rafael Núñez-Domínguez
title	Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis
title_short	Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis
title_full	Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis
title_fullStr	Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis
title_full_unstemmed	Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis
title_sort	evaluation of the romosinuano cattle population structure in mexico using pedigree analysis
publisher	Universidad de Antioquia
publishDate	2020
url	https://doaj.org/article/6918cc1c40f44014b4721833a49c7f31
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Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis

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