The aim of this study was to estimate genetic parameters for partial and cumulative egg production in a commercial broiler female line. Ten monthly periods between 25 and 64 weeks, three partial periods of 25 to 32, 33 to 48 and 49 to 64 cumulative weeks and three periods of 25 to 30, 40 and 50 weeks of age and total egg production were considered. The restricted maximum likelihood method under the animal model was used to estimate the covariance components and genetic parameters. The fixed effect of incubation and the additive genetic and residual random effects were considered. The estimated heritability ranged from 0.12 to 0.41. These estimates showed that the anterior and posterior periods of the higher production have greater genetic variability. The genetic correlations between periods of the egg production studied ranged from -0.12 to 0.98. In general, the pattern of variation was similar between the strategies evaluated and all were genetically associated with the total egg production. The results of this study showed that the improvement of the total egg production is feasible by selection of partial records. However, considering the relative efficiency of selection, the second month and the periods from the fortieth week of production would be the most suitable.
Broiler; genetic correlation; heritability; selection efficiency
e variância ambiental 
de períodos mensais, parciais, acumulados e total da produção de ovos em uma linha fêmea de frangos de corte
