611
Principal Components for Reproductive and Productive Traits in Buffaloes from Brazil

Wednesday, August 20, 2014
Posters (The Westin Bayshore)
Daniele Portela de Oliveira , Universidade Estadual Paulista “Júlio de Mesquista Filho” (FCAV-UNESP), Jaboticabal, Brazil
Camila da costa Barros , Universidade Estadual Paulista “Júlio de Mesquista Filho” (FCAV-UNESP), Jaboticabal, Brazil
Francisco Ribeiro Araujo Neto , Universidade Estadual Paulista “Júlio de Mesquista Filho” (FCAV-UNESP), Jaboticabal, Brazil
Daniela Lourenco , University of Georgia, Athens, GA
Naudin A Hurtado Lugo , Universidade Estadual Paulista “Júlio de Mesquista Filho” (FCAV-UNESP), Jaboticabal, Brazil
Humberto Tonhati , State University of Săo Paulo, Faculty of Agriculture and Veterinary Sciences, Jaboticabal, Brazil
Abstract Text: A total of 12,450 records for first-parity in dairy buffaloes were used in this study. Analyzed traits were age at first calving, interval between first and second calving, lactation length, somatic cell count, and milk, fat, protein, lactose, and total solids yields. The covariance components were estimated through principal components models by reduced-rank with third to ninth components. Direct additive genetic and residual random effects were included in all models. The three first eigenvalues explained 94.25% of the genetic variance on average. The estimates of heritability ranged from 0.03 to 0.31. The genetic correlation of production traits had moderate to high magnitude, and reproductive traits had negative and low to moderate  magnitude. According to the selection criterion, the four genetic principal components are appropriate for evaluation of economic traits for Buffaloes in Brazil. 

Keywords:

Dairy buffaloes

Reduced-rank

Economic traits

See more of: Posters: Genetics of Trait Complexes - Lactation
See more of: Genetics of Trait Complexes: Lactation
<< Previous Abstract | Next Abstract >>