Estimation of genetic parameters for weaning and yearling weights in a composite population used to form the Purunã breed

Abstract

We aimed to evaluate the effects of sex and the linear and quadratic components of age of dam at calving, as well as apply a mixed model including maternal effect for the genetic evaluation of weaning (WW) and yearling (YW) weights. The phenotypic database was composed by Charolais, Caracu, Aberdeen Angus, and Canchim purebred and crossbred animals. Single-trait analyses were performed using models that included the maternal effect for WW and YW traits, and a model ignoring this effect on YW (YWNM). The Deviance Information Criterion (DIC), model posterior probabilities (MPP), accuracy of breeding values (ACC), and Spearman's rank correlation were applied to compare the models including and ignoring the maternal effect on YW. Sex and age of dam at calving had significant effects on WW and YW. The direct heritability estimates were 0.21±0.03 and 0.05±0.02, and the maternal heritabilities were 0.11±0.02 and 0.02±0.01 for WW and YW, respectively. The heritabilities estimated for YW may have been influenced by the several genetic groups in the population and by used conventional animal model, which may not have been the better fit model to evaluate YW in this population. The DIC, MPP, and ACC values indicated that YW outperformed the YWNM model, but the rank correlation and percentages of individuals selected in common suggested that the best animals would be selected independently of the model chosen.

Brahman Crossbred Cattle's Performances Were Extensively Reared Based on the Integration of Oil Palm Cattle in South Arut District, West Kotawaringin Regency

“…The weighing results show that the average yearling weight of Brahman Crossbred cattle reared with an integrated system of oil palm cattle is 195,42 ± 3.9. These results are similar to the report of Otto et al [16] [17] where the mature weight is 298 + 71.8 kg. These differences can be influenced by various factors such as genetics, nutrition, maintenance location, system, and maintenance management.…”

Genetic and Genomic Characterization of a New Beef Cattle Composite Breed (Purunã) Developed for Production in Pasture-Based Systems

“…The Purunã breed is a composite population developed in Southern Brazil by crossing Angus, Charolais, Canchim, and Caracu, in identical proportions. This was performed to improve key traits of interest and exploit the complementarity among the breeds ( Otto et al, 2021 ), especially for production in pasture-based systems. The background research to generate the Purunã breed started at the Agronomic Institute of Paraná (IAPAR; Ponta Grossa, Paraná, Brazil) at the beginning of the 1980s, when IAPAR researchers estimated the heterosis in the crossbred progenies of Charolais x Caracu and Angus x Canchim ( Perotto et al, 2000a ; Perotto et al, 2000b ).…”

Table2.XLSX

“…The Purunã breed is a composite population developed in Southern Brazil by crossing Angus, Charolais, Canchim, and Caracu, in identical proportions. This was performed to improve key traits of interest and exploit the complementarity among the breeds (Otto et al, 2021), especially for production in pasture-based systems. The background research to generate the Purunã breed started at the Agronomic Institute of Paraná (IAPAR; Ponta Grossa, Paraná, Brazil) at the beginning of the 1980s, when IAPAR researchers estimated the heterosis in the crossbred progenies of Charolais x Caracu and Angus x Canchim (Perotto et al, 2000a;Perotto et al, 2000b).…”

“…Some studies in Brazil have evaluated the performance of the Purunã breed for carcass traits (Ito et al, 2010), meat production and quality traits (Missio et al, 2015), growth (Moura et al, 2014), and weight at different time points (Otto et al, 2021). These studies indicate animals slaughtered at 24 months of age, weighed an average of 460 kg, possessed a fat thickness close to 3 mm, and had a substantial concentration of fatty acids in the meat.…”

“…These studies indicate animals slaughtered at 24 months of age, weighed an average of 460 kg, possessed a fat thickness close to 3 mm, and had a substantial concentration of fatty acids in the meat. In addition, estimates of genetic parameters for growth traits have demonstrated heritable estimates (0.05-0.21) for body weights measured at different ages (Otto et al, 2021). However, no previous research to date has evaluated the genetic diversity and population structure of the Purunã breed.…”