白血病奶牛群中牛白血病病毒抗体及感染控制建议
Antibodies to bovine leukemia virus in a leukosis dairy herd and suggestions for control of the infection.
作者信息
Ferdinand G A, Langston A, Ruppanner R, Drlica S, Theilen G H, Behymer D E
出版信息
Can J Comp Med. 1979 Apr;43(2):173-9.
A closed herd of 765 Holstein-Friesian dairy cattle with a history of multiple cases of leukosis was tested for antibodies to bovine leukemia virus by the bovine leukemia-glycoprotein immunodiffusion test. A total of 355 animals (46.4%) were antibody positive. Prevalence was 60% in the 373 milking cows and 100% in the breeding bulls. Antibodies were present in 59% of newborn calves. Prevalence of antibodies was higher in older animals and cows in second lactation had a higher prevalence than cows in first lactation (72% vs 43%). Proposed control measures in this herd aim at preventing infection of calves, heifers and lactating cows by: 1) separating them into groups negative and positive for bovine leukemia virus antibodies, 2) not allowing calves to receive colstrum or milk from infected cows and 3) by using seronegative bulls for natural breeding tested at three month intervals. Calves should be tested after six months of age. Before this time calves of positive mothers should be treated as being positive.
对一群封闭饲养的765头荷斯坦 - 弗里生奶牛进行了检测，这群奶牛有多次白血病病例史，采用牛白血病糖蛋白免疫扩散试验检测牛白血病病毒抗体。共有355头动物（46.4%）抗体呈阳性。在373头泌乳奶牛中患病率为60%，在种公牛中患病率为100%。59%的新生犊牛体内有抗体。老年动物抗体患病率较高，第二胎泌乳奶牛的患病率高于第一胎泌乳奶牛（72%对43%）。该牛群建议采取的控制措施旨在防止犊牛、小母牛和泌乳奶牛感染，措施如下：1）将它们分为牛白血病病毒抗体阴性和阳性组；2）不让犊牛食用感染奶牛的初乳或牛奶；3）使用每隔三个月检测一次的血清阴性种公牛进行自然配种。犊牛应在6月龄后进行检测。在此之前，阳性母牛所生的犊牛应视为阳性。
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