Resumo

MARTINEZ MARIN, Gustavo Javier et al. Impact of the inclusion of foreign information on Mexican genetic evaluation of Holstein sires. Rev. mex. de cienc. pecuarias [online]. 2020, vol.11, n.4, pp.1045-1058.  Epub 02-Mar-2021. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v11i4.5379.

This study aimed to evaluate the impact of including foreign information of Holstein sires on their genetic evaluation for the following traits: milk, fat, and protein production in kilograms. This was achieved by comparing breeding values (BV) and reliabilities (R), grouping of sires by number of daughters, ordering of sires, and the genetic superiority expected per year ($∆I_s/ys$), with different scenarios determined by the selection intensity (${ip}_s$) of sires used in the national genetic evaluation (MEX-GE), those incorporated into the international genetic evaluation with daughters in Mexico (I-GE), and the international genetic evaluation with or without daughters in Mexico (MACE-GE). In total, was analyzed the information of 5,825 sires for MP and 3,914 for FP and PP. The foreign information has a positive impact in the MEX-GE as it improves R and the BV of the sires used in Mexico. It also allowed to observe important differences in the BV and R between evaluations, generating an opportunity to improve the Mexican Holstein population. Therefore, it is recommended continuing participating in the Interbull program and consider using the internationally validated information in the selection process of dairy cattle and their components. These actions can significantly contribute to the increase of the productive genetic progress in Mexico.

Palavras-chave : Genetic value; Reliability; Genetic evaluation; Genetic correlation.

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