Estimation of Genetic Parameters, and Genetic and Environmental Effects on Progeny Carcass Traits of a Nucleus Breeding Population in Japanese Black Cattle

概要

論文の詳細を見る
Genetic parameters of body weight at the start of fattening (BSF), carcass weight (CWT), subcutaneous fat thickness (SFT), rib thickness (RBT), meat quality grade (MQG), beef marbling score (BMS) and rib eye area (REA) in Japanese Black cattle were estimated. The effects of genetic and environmental factors on fattening performance and carcass quality traits of the progeny were also analyzed. The averages of BSF, CWT, SFT, RBT and REA were 189 kg, 408 kg, 24.9 mm, 69.3 mm and 47.5 cm^2, respectively. CWT was significantly affected (p<0.01) by sire, while BSF (p<0.01), CWT (p<0.01), SFT (p<0.01), RBT (p<0.01) and REA (p<0.05) were significantly affected by dam, indicating the scope of the applicability of selective breeding for improving the dam population for producing beef cattle with greater genetic ability to carcass traits. The sex of the calf had a significant (p<0.01 or p<0.05) effect on all the traits studied except REA. BSF, RBT, MQG and BMS were significantly (p<0.01) affected by the year and season of the birth of calves. The fattening farm exerted a significant influence (p<0.01) on BSF, CWT, MQG and BMS. The heritability estimates for BMS, CWT, RBT, BSF and MQG were 0.36, 0.34, 0.31, 0.26 and 0.23, respectively. Genetically, REA correlated negatively with BSF (-0.57) and SFT (-0.69), as did BMS with CWT (-0.35), SFT (-0.50) and RBT (-0.44). All the other traits correlated positively with one another.
東北大学の論文
2004-11-25