Abstract
Hanwoo cattle is one indigenous breed that have been improving its genetic performance through national evaluation system. 10 categories of Body measurement are one of evaluation trait in Hanwoo population that depicts indirect growth performance. Recent national evaluation system in 2021 have been using body measurement traits measured at 18 month that is not belong to any of the proper test period(e.g. 12, 24 month). Though body measurement traits measured at 12 month are abundant due to not only progeny but performance test animals, evaluation system that using traits measured at 18 month is still remained. Accordingly, this study focused on the data by measured points and models by single and multiple trait for informing to improve genetic evaluation of national evaluation system. Total 13370 animals from performance and progeny test animals and total of 84936 pedigree records were used. Evaluation group were allocated into 6 in total by 3 measured points and 2 models, and compared by each group. Where regarding only single and multiple trait model, mean of heritability for all traits is depicted as 0.27 and 0.28 in single and multiple trait model respectively. Correlation of breeding value between single and multiple trait model for each measured points was 0.87, while body measurement at 12 month which dataset includes performance test animals and traits at 12 month without performance test animals were shown 0.72 correlation. Accuracy of estimated breeding value was the least when single trait model with body measurement at 12 month and 18 month without performance test animals were used (63%). Multiple trait model using body measurement at 12 month with performance test were recorded as the highest accuracy at 74%, among the evaluation groups. Genetic trend in sires that have at least 6 progenies was in similar pattern annually for all evaluation group except single trait model with performance test animals that measured 12 month body measurement. The group using multiple trait model with traits at 12 month which have performance test records were higher for all traits than other groups. In short, this study was aimed to draw the advantages of multiple trait model using body measurement at 12 month including performance test animals.
Figures & Tables
Fig. 1. Genetic trends with all body measurement traits overall evaluation groups
