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The high incidence of meat of impaired quality poses a serious problem in the poultry industry. In recent years, the incidence of the pectoralis major muscle that appeared pale colored, remarkably hardened, and exudative, called “wooden breast” or “woody breast” has increased in slaughter houses. In the present study, 19-day-old Ross 308 broiler chickens affected (n = 10) and unaffected (n = 10) with remarkably hardened breast were selected from a commercial broiler farm, and reared to 55 days of age under a controlled environment. Among the affected birds, 5 of 10 birds appeared exhausted with markedly suppressed weight gain and 4 of 10 birds died during the rearing period. In contrast, all unaffected birds survived and most gained weight. Four of 10 unaffected birds lost the ability of back-to-back wing contact by the late stage of rearing. The biochemical analysis of blood plasma samples of 20-day-old birds revealed that creatine kinase and L-aspartate aminotransferase values in most affected birds were higher than those in unaffected birds; however, these values in unaffected birds increased rapidly with lost wing contactability and increasing age. Postmortem examinations revealed that the mean diameter of myofibers in affected birds was smaller than that in unaffected birds. Moreover, symptoms of degenerative and regenerative muscles were observed in most birds in both groups. Among them, a decrease in, or defect of, the characteristic polygonal shape of myofibers was the most common change within the pectoralis major muscles in both groups. The present study demonstrated that broilers affected with remarkably hardened breast during the middle stage of rearing would have suppressed physical status and weight gain, or would die. It was suggested that rapid growth in broilers might be a cause of remarkably hardened breast.

2023-03-20 02:54:17
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4 0 0 0 OA 横光利一と川端康成の関東大震災 : 被災した作家の体験と創作

著者: 十重田裕一
出版者: 早稲田大学総合人文科学研究センター
雑誌: 早稲田大学総合人文科学研究センター研究誌 = WASEDA RILAS JOURNAL (ISSN:21878307)
巻号頁・発行日: vol.1, pp.171-175, 2013-10-21

2023-03-18 21:26:13
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http://hdl.handle.net/2065/39951

4 0 0 0 OA 学校法人,及び財団法人における評議員会制度の意味

著者: 岡本仁宏 Masahiro Okamoto
雑誌: 法と政治 = The journal of law & politics (ISSN:02880709)
巻号頁・発行日: vol.73, no.3, pp.1(391)-59(449), 2022-11-30

2023-03-16 12:42:36
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http://hdl.handle.net/10236/00030495

4 0 0 0 OA 特別修学支援室と連携して行う,障害のある学生へのサービス : 北海道大学附属図書館の事例

著者: 小林泰名栗田とも子河野由香里
出版者: 大学図書館研究編集委員会
雑誌: 大学図書館研究 (ISSN:03860507)
巻号頁・発行日: vol.108, pp.1714-1-1714-9, 2018-03

障害学生支援は大学全体として取り組むべき課題であり,その中に「大学図書館の障害者へのサービス」が位置付けられる。北海道大学附属図書館では2012年3月から,障害学生支援担当部署と連携して「プリント・ディスアビリティのある利用者のための資料電子化サービス」等の障害学生へのサービスに取り組んでいる。2017年9月までの5年半の取り組みについて報告する。