Abstract
This study was conducted to estimate the effect of sex, breed and on the basis of the records on 300 pigs of Duroc, Landrace and Yorkshire breeds raised at the National Institute of Animal Science. Yorkshire was observed to be superior to other breeds between 90 to 110 ㎏ of body weight. Thicker backfat was estimated in the B-mode than in A-mode of 110 ㎏s range than in 90 ㎏s. Loin eye muscle area was larger in the final weight of 110 ㎏ than in 90 and the Duroc had significantly (p＜0.05) larger loin eye muscle area than other breeds. Thinner backfat was observed in males than in females in both modes of backfat measurements and in both of the final weights of test. Females had significantly larger loin eye muscle area than males, and the difference between the two sexes were larger in the final weight of 110 ㎏ than in 90 ㎏. Analysis models concluded that backfat thickness certainly influences the body weight gain when at 90 ㎏s and 110 ㎏s analysed with A-mode and B-mode respectively.
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