TY - JOUR
T1 - Components of (co)variance for age at first and second calving of nellore females raised in Southern Brazil
AU - Bresolin, Tiago
AU - Everling, Dionéia Magda
AU - Braz, Camila Urbano
AU - Breda, Fernanda Cristina
AU - Rorato, Paulo Roberto Nogara
PY - 2015
Y1 - 2015
N2 - The objective of this study was to estimate the heritability, genetic correlation and estimated breeding values for age at first (AFC) and second calving (ASC) for Nellore females raised in Southern Brazil. The (co)variance and estimated breeding values were obtained using Bayesian inference in a bivariate analysis, adopting an animal model. The average ages were 49.30 and 69.85 months, and the heritabilities were 0.25 and 0.26, respectively for AFC and ASC. The genetic correlation between AFC and ASC was 0.88. The correlation between the classifications of sires according to their estimated breeding values was 0.93. The heritability estimates for AFC and ASC suggest the possibility of obtaining genetic gain by selection. The correlation between these traits close to one indicates that they are virtually controlled by the same genes, and the selection for one of them will promote correlated advanced gain for the other.
AB - The objective of this study was to estimate the heritability, genetic correlation and estimated breeding values for age at first (AFC) and second calving (ASC) for Nellore females raised in Southern Brazil. The (co)variance and estimated breeding values were obtained using Bayesian inference in a bivariate analysis, adopting an animal model. The average ages were 49.30 and 69.85 months, and the heritabilities were 0.25 and 0.26, respectively for AFC and ASC. The genetic correlation between AFC and ASC was 0.88. The correlation between the classifications of sires according to their estimated breeding values was 0.93. The heritability estimates for AFC and ASC suggest the possibility of obtaining genetic gain by selection. The correlation between these traits close to one indicates that they are virtually controlled by the same genes, and the selection for one of them will promote correlated advanced gain for the other.
KW - Bayesian inference
KW - Beef cattle
KW - Fertility
KW - Genetic parameters
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U2 - 10.1590/1089-6891v16i428131
DO - 10.1590/1089-6891v16i428131
M3 - Article
AN - SCOPUS:84947073737
SN - 1518-2797
VL - 16
SP - 474
EP - 480
JO - Ciencia Animal Brasileira
JF - Ciencia Animal Brasileira
IS - 4
ER -