Abstract:

Research on loci influencing milk production traits of dairy cattle is one of the main topics of investigation in livestock. Many genomic regions and polymorphisms associated with dairy production have been reported worldwide. In this context, the purpose of this study was to identify candidate loci associated with milk yield in Argentinean dairy cattle. A database of candidate genes and single nucleotide polymorphisms (SNPs) for milk production and composition was developed. Thirty-nine SNPs belonging to 22 candidate genes were genotyped on 1643 animals (Holstein and Holstein x Jersey). The genotypes obtained were subjected to association studies considering the whole population and discriminating the population by Holstein breed percentage. Phenotypic data consisted of milk production values recorded during the first lactation of 1156 Holstein and 462 Holstein x Jersey cows from 18 dairy farms located in the central dairy area of Argentina. From these records, 305-day cumulative milk production values were predicted.

EEA Pergamino

Author affiliation: Raschia, Maria Agustina. INTA. Instituto de Genética; Argentina.

Author affiliation: Nani, Juan Pablo. INTA. Estación Experimental Agropecuaria Rafaela; Argentina.

Author affiliation: Maizon, Daniel Omar INTA. Estación Experimental Agropecuaria Anguil; Argentina.

Author affiliation: Beribe, Maria Jose. INTA. Estación Experimental Agropecuaria Pergamino. Departamento de Estadística; Argentina

Author affiliation: Amadio, Ariel. INTA. Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.

Author affiliation: Poli, Mario Andres. INTA. Instituto de Genética; Argentina.