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A three years retrospective study on the nature and cause of ocular dermoids in cross-bred calves

机译:杂交小牛眼皮样病的性质和病因的三年回顾性研究

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Nature and cause of ocular dermoids were investigated by field studies, pedigree analysis, clinical examination and light microscopy. It was determined that ocular dermoids in cross-bred calves are genetically- transmitted defects. Calves typically were affected unilaterally or bilaterally with multiple, connected ocular growths that clinically and histologically mimicked normal haired skin. Sites most commonly involved included ventro-lateral limbus, third eyelid, medial canthus, eyelid and conjunctiva. Centro-corneal and anterior segmental dermoids were also observed. It is postulated from this study that bilateral ocular dermoids are genetically-transmitted defects in Hereford cattle. Characteristics of both autosomal recessive and polygenic inheritance were observed. However, mode of inheritance and role of environment in the pathogenesis of these peculiar and important developmental defects remain undefined. Extensive breeding trials utilizing superovulation, embryo transfer, and pre-terminal caesarean section as well as further field studies might be mandatory to confirm sex incidence, significance of associated somatic defects, role of environment in phenotypic expression, and mode of transmission of ocular dermoids in cross-bred calves. Keywords : Cross-bred calves, Dermoid cysts, Incidence, Ocular dermoids, Surgical intervention.
机译:通过野外研究,谱系分析,临床检查和光学显微镜检查了眼皮的性质和病因。可以确定杂种犊牛的眼皮瘤是遗传缺陷。小牛通常单侧或双侧受到多个相连的眼部生长的影响,临床上和组织学上都模拟正常的毛发皮肤。最常累及的部位包括腹外侧缘,第三眼睑,内can,眼睑和结膜。还观察到了角膜中央和前节皮肤。从这项研究中推测,双侧眼皮瘤是赫里福德牛的遗传传播缺陷。观察到常染色体隐性遗传和多基因遗传的特征。然而,遗传模式和环境在这些特殊和重要的发育缺陷的发病机理中的作用仍然不确定。利用超排卵,胚胎移植和剖腹产前剖宫产的广泛育种试验以及进一步的田间研究可能对于确认性别发生率,相关体细胞缺陷的重要性,环境在表型表达中的作用以及眼皮样疾病的传播方式可能是强制性的。杂交小牛。关键字:杂交犊牛,皮样囊肿,发病率,眼皮样变化,外科手术。

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