Genetic and phenotypic parameters were estimated based on 22,468 lactations records of Gir cows. Statistical analyses were carried out by an animal model, in multitrait analyses using the REML method. A bioeconomic model was developed to calculate economic values. Expected economic responses to selection were compared for two breeding goals: 1) only milk yield (HGL1); 2) milk yield plus fat and protein yields (HGL2). Heritability estimates for milk, protein and fat yields were 0.33 ± 0.02, 0.26 ± 0.02 and 0.24 ± 0.02, respectively. All phenotypic and genetic correlations were high and positive. Economic values for milk, fat and protein were US$0.18, US$0.27 and US$7.04, respectively. The expected responses for HGL1 and HGL2 were US$79.82, and US$127.37, respectively. These results indicated that milk components traits should be included in breeding goals for the Dairy Gir Breeding Program in Brazil.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Breeding objectives, economics of selection schemes, and advances in selection theory (Posters), , 387, 2014
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