豚の枝肉形質推定値に対する世代および性の効果

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タイトル別名
  • Generation and Sex Effects on Ultrasonic Estimates of Carcass Traits of Pigs
  • ブタ ノ エダニク ケイシツ スイテイチ ニ タイスル セダイ オヨビ セイ

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A total of 997 Landrace pigs were ultrasonically scanned from first to fifth generations (G1 to G5) to investigate some factor effects on the carcass traits of fat thickness (FT), intermuscular fat thickness (IMFT), muscle thickness (MT), M. longissimus thoracis area (MLTA), total muscle thickness (MmT) and rib thickness (RT). Each trait was measured at four positions on the left side part of the body at a constant weight of 90kg. The scanning positions were A to D from shoulder to midback. Positions A and C were about 5cm from the midline with positions B below A and D below C. Positions A, B and C, D were at the 5th and 13th rib sections, respectively. A combination of trait and position was used as a trait. For example, FT and MLTA on position A were defined as A-FT and A-MLTA, respectively. Most of the FT estimates were found to decrease from G1 to G5. MLTA increased from G1 to G5. A-FT, C-FT, A-IMFT, A-MT, B-MmT and B-RT of females were significantly higher than those of males. The selected group had significant thinner FT and larger MLTA than that of the non-selected group on positions A and C. Generation×sex interaction was significant for A-FT, C-FT, A-MLTA and D-RT. Generation×selection interaction was significant for FT on positions A, C and D, MLTA on positions A and C, and D-RT. The linear regression of fattening period was significantly negative for FT in all positions, B-MmT and RT on positions B and D.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 66 (9), 757-765, 1995

    公益社団法人 日本畜産学会

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