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





effective population size, gene flow, genetic diversity, genetic drift, generation interval, inbreeding, pedigree, population structure, probability of gene origin, Romosinuano cattle


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.

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Author Biographies

Rafael Núñez-Domínguez, Chapingo Autonomous University

Department of Zootechnics, Chapingo Autonomous University, Chapingo, México.

Ricardo E. Martínez-Rocha, Chapingo Autonomous University

Department of Zootechnics, Chapingo Autonomous University, Chapingo, México.

Jorge A. Hidalgo-Moreno, Chapingo Autonomous University

Department of Zootechnics, Chapingo Autonomous University, Chapingo, México.

Rodolfo Ramírez-Valverde, Chapingo Autonomous University

Department of Zootechnics, Chapingo Autonomous University, Chapingo, México.

José G. García-Muñiz, Chapingo Autonomous University

Department of Zootechnics, Chapingo Autonomous University, Chapingo, México.


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How to Cite

Núñez-Domínguez, R., Martínez-Rocha, R. E., Hidalgo-Moreno, J. A., Ramírez-Valverde, R., & García-Muñiz, J. G. (2020). Evaluation of the Romosinuano cattle population structure in Mexico using pedigree analysis. Revista Colombiana De Ciencias Pecuarias, 33(1), 44–59. https://doi.org/10.17533/udea.rccp.v32n4a05



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