Random regression models for milk, fat and protein in Colombian Buffaloes
Journal Title: Revista MVZ Cordoba - Year 2015, Vol 20, Issue 1
Abstract
Objective. Covariance functions for additive genetic and permanent environmental effects and, subsequently, genetic parameters for test-day milk (MY), fat (FY) protein (PY) yields and mozzarella cheese (MP) in buffaloes from Colombia were estimate by using Random regression models (RRM) with Legendre polynomials (LP). Materials and Methods. Test-day records of MY, FY, PY and MP from 1884 first lactations of buffalo cows from 228 sires were analyzed. The animals belonged to 14 herds in Colombia between 1995 and 2011. Ten monthly classes of days in milk were considered for test-day yields. The contemporary groups were defined as herd-year-month of milk test-day. Random additive genetic, permanent environmental and residual effects were included in the model. Fixed effects included the contemporary group, linear and quadratic effects of age at calving, and the average lactation curve of the population, which was modeled by third-order LP. Random additive genetic and permanent environmental effects were estimated by RRM using third- to- sixth-order LP. Residual variances were modeled using homogeneous and heterogeneous structures. Results. The heritabilities for MY, FY, PY and MP ranged from 0.38 to 0.05, 0.67 to 0.11, 0.50 to 0.07 and 0.50 to 0.11, respectively. Conclusions. In general, the RRM are adequate to describe the genetic variation in test-day of MY, FY, PY and MP in Colombian buffaloes.
Authors and Affiliations
Naudin Hurtado-Lugo, Ph. D| University of São Paulo, Faculty of Agrarian and Veterinary Sciences (FCAV), State Jaboticabal (UNESP), 14884900, SP, Brazil.Universidad de Antioquia, Facultad de Ciencias Agrarias, Grupo de investigación GaMMA, Carrera 75 No 65-87. Medellín, Colombia., Humberto Tonhati, Ph. D| University of São Paulo, Faculty of Agrarian and Veterinary Sciences (FCAV), State Jaboticabal (UNESP), 14884900, SP, Brazil., Raul Aspilcuelta-Borquis, Ph. D| University of São Paulo, Faculty of Agrarian and Veterinary Sciences (FCAV), State Jaboticabal (UNESP), 14884900, SP, Brazil., Cruz Enríquez-Valencia, M. Sc| University of São Paulo, Faculty of Agrarian and Veterinary Sciences (FCAV), State Jaboticabal (UNESP), 14884900, SP, Brazil., Mario Cerón-Muñoz, Ph. D *| Universidad de Antioquia, Facultad de Ciencias Agrarias, Grupo de investigación GaMMA, Carrera 75 No 65-87. Medellín, Colombia.Corresponding: cerongamma@gmail.com
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