| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥1,100,000 (Direct Cost: ¥1,100,000)
|
|---|
| Research Abstract |
The best linear unbiased prediction (BLUP) procedure was used to evaluate sires in populations having a high relationship among sires and a partial frequency of sire mates. Traits analyzed in this study were the mean daily weight gain (DG), backfat thickness (BF), feed conversion (CR), loine lenghth (RL), eye muscle area (EM) and rate of ham (HR) of 464 registered Landrace Pigs descended from 23 sires in Yamagata Prefecture from 1980 to 1987.
Expected progeny difference (EPD) was compared among the three models ; MM model (without relationship among sires), MMR (with relationship) and LSM (not BLUP). The average coefficient of relationship between the 23 sires was 9.0%. The heritability estimates obtained was 0.71 for DG, 0.82 for CR, 0.42 for RL, 0.42 for EM, 0.25 for HR and 0.54 for BF, respectively. Correlation between MM and MMR ranged from 0.984 to 0.997, and those between LSM and other models ranged from 0.985 to 1.0. The estimated breeding value from the best situational model at present, the MM and the MMR model, had the loer variance of prediction errors. These results indicate the these models are useful as a practical sire evaluation procedure for pig performance traits in Yamagata Prefecture.
|
