Selection

Genetic parameters for productive life traits and reproductive efficiency traits at 6 years in Nellore cattle

J. C. C. Balieiro, Eler, J. P., Ferraz, J. B. S., Mattos, E. C., and Balieiro, C. C., Genetic parameters for productive life traits and reproductive efficiency traits at 6 years in Nellore cattle, vol. 7, pp. 1312-1318, 2008.

The objective of the present study was to estimate (co)variance components for length of productive life (LPL) and some alternative reproductive traits of 6-year-old Nellore cattle. The data set contained 57,410 records for age at first calving from Nellore females and was edited to remove animal records with uncertain paternity and cows with just one piece of calving information. Only animals with age at first calving ranging from 23 to 48 months and calving intervals between 11 and 24 months were kept for analysis. LPL and life production (LP) were used to describe productive life.

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