Hawkins C D, Swan R A, Chapman H M
Aust Vet J. 1981 Oct;57(10):455-7. doi: 10.1111/j.1751-0813.1981.tb05764.x.
A high prevalence of squamous cell carcinoma of the perineal region of ewes was detected in the wheat belt area of Western Australia. A postal survey of 80 farms was conducted in the area, seeking information on the epidemiology of the condition, based on the farmers identification of the disease, Eighty-two per cent of flocks surveyed were affected, the mean prevalence in ewes of all ages being 2.29% (range 0.12% to 4.0%). The prevalence increased with age, from 0.05% in 1- to 2-year-old ewes to 3.09% in ewes over 5 years of age. The prevalence in the population of 121,605 ewes on all farms (affected and unaffected) surveyed, was 0.93%. The majority of lesions (88.9%) involved the vulva. The tail was affected in 23.8% of cases and the perineum in 12.8%. Affected ewes were usually destroyed and were a direct financial loss. Only 2 farmers reported the condition in rams, and 5 in wethers. Causal factors were not identified, although the radical Mules operation, time of shearing, and solar radiation were implicated.
在西澳大利亚的小麦种植区，检测到母羊会阴区域鳞状细胞癌的高发病率。基于农民对该病的识别，对该地区80个农场进行了邮政调查，以获取有关该病流行病学的信息。接受调查的羊群中有82%受到影响，所有年龄段母羊的平均患病率为2.29%（范围为0.12%至4.0%）。患病率随年龄增长而增加，1至2岁母羊的患病率为0.05%，5岁以上母羊的患病率为3.09%。在所有接受调查的农场（包括受影响和未受影响的）的121,605只母羊中，患病率为0.93%。大多数病变（88.9%）累及外阴。23.8%的病例尾巴受到影响，12.8%的病例会阴受到影响。患病母羊通常被宰杀，造成直接经济损失。只有2名农民报告公羊患有该病，5名农民报告阉羊患有该病。尽管怀疑与根治性穆勒手术、剪毛时间和太阳辐射有关，但未确定致病因素。
