Interaction between genotype and geographic region for milk production in Mexican Holstein cattle
Por:
Valencia M., Montaldo H.H., Ruíz F.
Publicada:
1 ene 2008
Resumen:
In order to investigate the presence of genotype-region interactions for milk yield in Holstein cattle in Mexico, first lactation, 305-days mature-equivalent milk production records were used. Data were classified as belonging to three regions of the country: Northern, Central and Southern. Genetic correlations (rg) were estimated for pairs of regions using bivariate animal models. Only data from sires with daughters in two regions were used in each analysis. Models included herd-year-season of calving as fixed effect and animal as random effects. The rg among Northern-Central, Northern-Southern and Central-Southern regions were 0.73, 0.38 and 0.93, respectively. The rg Northern-Southern was significantly smaller than unity (p= 0.002), while for the rg Northern-Central, the test approached significance (p=0.07). These results indicate the existence of genotype-environment interaction which may have several implications for the genetic improvement of Holstein cattle in Mexico. It also encourages further studies oriented toward the identification of specific environmental effects related to these interactions.
Filiaciones:
Valencia M.:
Instituto de Ciencias Agrícolas, Universidad de Guanajuato, ExHacienda El Copal, AP311, Irapuato, 36500, Guanajuato, Mexico
Montaldo H.H.:
Facultad de Medicina Veterinaria Y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Coyoacán. D.F., Mexico
Ruíz F.:
Centro Nacional de Investigación en Fisiología Animal, INIFAP-SAGARPA. México, Km 1 carretera a Colón, Ajuchitlán 76280. Querétaro, Mexico
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