Laboratory of Veterinary and Comparative Histopathology, Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche "Togo Rosati", via G. Salvemini, 1 - 06126 Perugia, Italy.
Igiene degli allevamenti e delle Produzioni Zootecniche, Azienda Sanitaria Locale Umbria 1, Piazza del Tabacchificio, 8 - 06083 - Bastia Umbra, Italy.
Vet Ital. 2020 Jul 14;56(2):137-140. doi: 10.12834/VetIt.1624.8712.1.
Chianina is an Italian cattle breed appreciated for its meat and resilience skills. No standard values are present in literature regarding Chianina thymic involution. A possible early physiological involution has been reported during the Italian National Residue Plan screening tests. The aim of this work was to perform an anatomo‑histopathological study of the thymus in Chianina cattle to improve knowledge about thymic involution in this breed. Forty Chianina bulls (16‑24 months old), never treated with corticosteroids and regularly slaughtered in the Umbria region (Italy), were enrolled. Animals aged 19‑21 months which received score 3 thymic atrophy had a prevalence of 0.15 (CI 95%: 0.02‑0.45%), while the prevalence was 0.29 (CI 95%: 0.10‑0.56%) among animals aged 22‑24 months. The thymus/carcass weight and thymic cortex/medulla ratio resulted close to those reported in cattle experimentally challenged with corticosteroids. Results suggest that the Chianina breed could be characterized by a physiological premature involution of the thymus gland in comparison to other breeds. These results represent a starting point to increase the reliability of the National Residue Plan histological screening test.
奇亚纳纳牛是一种意大利牛品种，以其肉质和适应能力而受到赞赏。关于奇亚纳纳牛的胸腺退化，文献中没有标准数值。在意大利国家残留计划筛选测试中，曾报道过一种可能的早期生理性退化。本研究旨在对奇亚纳纳牛的胸腺进行解剖组织病理学研究，以提高对该品种胸腺退化的认识。本研究共纳入了 40 头奇亚纳纳公牛（16-24 月龄），这些公牛从未接受过皮质类固醇治疗，且定期在意大利翁布里亚地区屠宰。19-21 月龄、胸腺萎缩评分 3 分的动物的患病率为 0.15（95%CI：0.02-0.45%），而 22-24 月龄的动物的患病率为 0.29（95%CI：0.10-0.56%）。胸腺/胴体重量和胸腺皮质/髓质比接近那些在牛中用皮质类固醇进行实验性挑战的报道。结果表明，与其他品种相比，奇亚纳纳牛品种的胸腺可能具有生理性的过早退化。这些结果为提高国家残留计划组织学筛选测试的可靠性提供了一个起点。
