Regional SHIKORI occurrence rate of fattening Holstein steer carcasses shipped from a farm with high SHIKORI occurrence

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  • シコリ発生頻度の高いホルスタイン種去勢牛肥育農場における部分肉別シコリ発生分布に関する検討
  • シコリ ハッセイ ヒンド ノ タカイ ホルスタインシュ キョセイギュウ ヒイク ノウジョウ ニ オケル ブブンニク ベツ シコリ ハッセイ ブンプ ニ カンスル ケントウ

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Abstract

SHIKORI (muscle inflammation) is considered to be a defect based on Japanese Beef Carcass Grading Standards, and results in economic loss, because meat containing SHIKORI will not be accepted or not well received by consumers. The cause of SHIKORI is currently unknown and has yet to be clarified. The objective of this study is to determine the frequency of SHIKORI occurring on beef carcasses in Japan. Specifically, carcasses were examined at 2 processing time points (carcass grading and cutting) of 493 fattening Holstein steers shipped from a farm with high SHIKORI occurrence. The trapezius muscle portion of the carcass was thoroughly examined for SHIKORI in the neck (Lean cubing), Chuck (Chuck roll), and Loin regions. In addition, the following processed cut regions were examined : Lean cubing, Chuck roll, Loin, Fillet, Brisket, Short plate, Top-round, Knuckle, D Rump, Gooseneck round and Shank. SHIKORI were assessed by the following parameters : SHIKORI occurrence rate (%) based on individual (right, left, or both) and regional localization. The regional occurrence rate were highest in the Loin (P < 0.01). When examining right versus left side carcass, there were no significant difference between left side and right side in SHIKORI occurrence rate at any cut regions. Comparing single versus dual side SHIKORI occurrence rates, single side rates were significantly higher for Chuck roll, Loin, D Rump and Gooseneck round regions (P < 0.05). In addition, SHIKORI occurrence rate of trapezius muscle at the Neck (Lean cubing), Chuck (Chuck roll), and Loin region were higher as compared to other muscle. All steers which had SHIKORI occurrence in the trapezius muscle were confirmed that the location always included the Loin cut. Therefore, these results indicate that ; 1) SHIKORI occurs by the cut region including the outer muscle like Loin in many cases ; 2) SHIKORI demonstrates no bilaterally symmetry, with differing single side—dual side occurrence rates ; and 3) SHIKORI in trapezius muscle is continuously spanning in this muscle, and more prevalent in the rear region of this muscle.

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