Genetic (CO)variances between milk yield and growth traits in a multibreed population in the tropical regions of Mexico

Roman Ponce, S.I.; Ruiz Lopéz, F.J.; Montaldo Valdenegro, H.H.; Castañeda Martinez, O.G.; Roman Ponce, H.; Rizzi, R.; Lopez Guerrero, I.; Hernandez Hernandez, V.D.; Calderon Robles, R.; Sanchez Reyes, S.; Granados Zurita, L.

The objective of this study was to estimate genetic parameters for milk yield (MY), birth weight (BW) and weights adjusted to 205 and 365 days of age (P205 and P365, respectively) and to evaluate the genetic relationship between first lactation milk yield (MY1) and P205 using restricted maximum likelihood methodology. Estimates of direct heritability were 0.120.04, 0.400.09, 0.280.05 and 0.250.05 for MY, BW, P205 and P365, respectively. Repeatability for MY was 0.340.02. The correlation between MY1 and P205 was 0.1980.45, thus both traits need to be considered in selection improvement programs.

Genetic (CO)variances between milk yield and growth traits in a multibreed population in the tropical regions of Mexico / S.I. Roman Ponce, F.J. Ruiz Lopéz, H.H. Montaldo Valdenegro, O.G. Castañeda Martinez, H. Roman Ponce, R. Rizzi, I. Lopez Guerrero, V.D. Hernandez Hernandez, R. Calderon Robles, S. Sanchez Reyes, L. Granados Zurita - In: Proceedings of the 8th World Congress on Genetics Applied to Livestock Production / World Congress on Genetics Applied to Livestock Production <8. ; 2006 ; Belo Horizonte>. - Belo Horizonte : Instituto Prociência, 2006. - ISBN 85-60088-01-06. (( Intervento presentato al 8. convegno World Congress on genetics applied to livestock production tenutosi a Belo Horizonte nel 2006.