Abstract

Proceedings of the World Congress on Genetics Applied to Livestock Production, 107 Phenotypic and genetic trends in the MOET nucleus selection scheme for milk production in Guzerá cattle M.G.C.D. Peixoto1, M.R. Saidler2, F.Â.T. Bruneli1, G.G. dos Santos1 1 Núcleo Temático de Produção e Bem-estar Animal – Embrapa Gado de Leite, Rua Eugênio do Nascimento, 610, 36038-330, Juiz de Fora, MG, Brazil gabriela.peixoto@embrapa.br (Corresponding Author)mailto:ovis@fcav.unesp.br 2 CES/JF, Avenida Luz Interior, 345, 36030-776, Juiz de Fora, MG, Brazil The objective of this study was to evaluate inbreeding and phenotypic and genetic trends in the MOET nucleus selection scheme for milk production traits in the Guzerá breed. Information was obtained from the database of the National Program for the Improvement of the Guzerá Dual Purpose (PNMGuD). The data consisted of 305-days milk and solids yield, individual estimates of PTA for both traits, as well as of individual inbreeding coefficients. Annual averages were calculated from 1994 to 2013. To access trends, the means were regressed on the birth year of animals. The trend for inbreeding revealed an annual increase of 0.05%, which is considered low and can be attributed to both mating planning and inclusion of genetically distant families in the nucleus. Positive trends of the phenotypic (+22 kg/year) and genetic (+12 kg/year) means were attributed to the genetic gain promoted by the selection scheme in the nucleus. In conclusion, the MOET nucleus scheme was effective in contributing to the genetic progress of the Guzerá cattle for milk traits, without significant impact on the average inbreeding coefficient. Keywords: Breeding value, Inbreeding, Milk Production, Selection, Zebu cattle

Maria Gabriela P Peixoto, Miriã Saidler, Frank Ângelo Bruneli, Glaucyana Santos

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Genetic Gain - Breeding Strategies 1, , 107, 2018
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