UNASSIGNED: The Tabapu   breed is a beef @entity291 Brazilian breed known for its @entity17246 and desirable characteristics for tropical conditions. However, this is a newly formed breed and few studies have been conducted regarding genetic parameters and genetic trends for its reproductive traits. The objective of the present study was to estimate the genetic parameters, genetic trends, and relative selection efficiency for weaning weight adjusted to 210 d of age (W210), age at first calving (AFC), average calving interval (ACI), first calving interval (CI1), and @entity409 ( @entity409 ) among Tabapu   beef @entity291 . Pedigree data on 15,241 Tabapu   animals born between 1958 and 2011 and phenotype records from 7,340 @entity291 born between 1970 and 2011 were supplied by the National Association of Breeders and Researchers (Associa    o Nacional de Criadores e Pesquisadores). Analysis through the least squares method assisted in defining the fixed effects that were considered within the models. The estimates for the genetic parameters were obtained through the REML, using a multitrait animal model. The likelihood ratio test applied for W210 was significant ( < 0.05) for the inclusion of maternal additive genetic and permanent environmental effects in the model. Genetic trends were calculated through linear regression of the EBV of the animals, according to the year of birth. The heritability estimates obtained ranged from 0.04    0.03 for CI1 to 0.25    0.05 for W210. The genetic correlations ranged from 0.004    0.19 for W210-AFC and 0.93    0.12 for ACI-CI1. The genetic trend was significant ( < 0.05) and favorable for CI1 and the maternal genetic effect of W210 and was significant ( < 0.05) and unfavorable for AFC, ACI, and @entity409 . The @entity409 could be used in the selection index to assist the breeding goal of improved productive and reproductive performance. The genetic trends indicated small and unfavorable genetic changes for AFC, ACI, and @entity409 in light of the recent implementation of a genetic breeding program for this breed.

Estimates of genetic parameters and genetic trends for reproductive traits and weaning weight in Tabapu   XXXX .

@entity409 :: ('MESH:D008107', 'Disease') :: ['accumulated productivity', 'ACP'] @entity291 :: ('9913', 'Species') :: ['cows', 'cattle'] @entity17246 :: ('MESH:C538542', 'Disease') :: ['sexual precocity']
@entity291 :: (9913,Species) :: ['cattle']
