Genetic evaluation for weight traits in commercial Brahman cattle
Journal: REVISTA MVZ CÓRDOBA (Vol.24, No. 2)Publication Date: 2019-05-01
Authors : Christian Bedoya O; Jovany Alzate R; Juan Ángel C; Carlos Escobar R; Samir Calvo C;
Page : 7225-7230
Keywords : Animal model; beef cattle; genetic correlation; genetic progress; heritability;
Abstract
Objective. Evaluate genetically the traits of birth weight and weaning weight in commercial Brahman cattle. Materials and methods. A total of 1.015 records of birth weight (BWT) and weaning weight adjusted to 270 days (WW270), were evaluated. Data correspond to the offspring born between 2002 and 2014 belonging to “La Envidia” farm, located in the municipality of Planeta Rica, Córdoba. A bi-character animal model that included, additive genetic effect, maternal effect and sex, month, year and age at weaning as fixed effects, was used. Genetic parameters were estimated using the MTDF-REML software. Results. The average and coefficient of variation (CV) of BWT was 29.62±3.13 kg and 10.59%, respectively. The mean and CV for WW270 was 216.71±26.97 kg and 12.45%, respectively. The estimates of direct heritability were 0.44±0.143 and 0.39±0.12 for BWT and WW270, respectively. Maternal heritability was 0.09±0.092 and 0.42±0.087 for BWT and WW270, respectively. The estimated genetic and phenotypic correlation between the evaluated characteristics was 0.11 and 0.13, respectively; with genetic progress per year of -2.02 kg for BWT and 7.81 kg for WW270. Conclusions. The estimations of heritability indicate the existence of direct additive genetic variability, evidencing the opportunity of genetic gain through selection. However, environment have a great influence on birth weight and weaning weight traits, which is why special attention should be paid to the handling and nutrition of females during pregnancy and of calves from birth to weaning.
Other Latest Articles
- Morphological characterization of the creole backyard chickens of the Subregion sabana department of Sucre (Colombia)
- Describing the planktonic and bacterial communities associated with bocachico Prochilodus magdalenae fish culture with biofloc technology
- Superovulatory response in Brahman donor cows using follicular ablation before superovulation protocols
- Selection markers in Pampa Rocha pigs: a comparison with autochthonous breeds of Spain and Portugal
- Expected progeny difference for the weaning weight in crossbred heifers selection in Manabí
Last modified: 2019-06-29 04:05:40