Kirkland P D, Mackintosh S G, Moyle A
NSW Department of Agriculture, Virology Laboratory, Elizabeth Macarthur Agricultural Institute, Australia.
Vet Rec. 1994 Nov 26;135(22):527-9. doi: 10.1136/vr.135.22.527.
During the certification of the bulls at an artificial breeding centre for freedom from pestivirus infection, a single viraemic bull was identified, and further testing confirmed that it was persistently infected. The two-year-old bull was healthy and of similar bodyweight to its peers. Its semen was of normal quality on the basis of density, motility and morphological criteria. Approximately 600 doses of semen had been distributed for sire evaluation purposes to 97 dairy farms. An examination of the breeding records indicated a first service conception rate of 38 per cent. All but one of the 162 cows inseminated with the bull's semen were seropositive compared with 95 of 143 cows (66.4 per cent) inseminated with semen from other bulls. Virological studies of the 61 calves sired by the persistently infected bull revealed that two were persistently infected, but that the others were healthy and uninfected. It was concluded that the semen from this bull was a potential source of pestivirus infection for 'clean' herds.
在人工授精中心对公牛进行瘟病毒感染检测以确保其无感染时，发现一头病毒血症公牛，进一步检测证实其为持续感染。这头两岁的公牛健康，体重与同龄公牛相近。根据密度、活力和形态学标准，其精液质量正常。大约600剂精液已分发至97个奶牛场用于种公牛评估。对配种记录的检查显示首次配种受胎率为38%。用该公牛精液输精的162头母牛中，除一头外均为血清阳性，而用其他公牛精液输精的143头母牛中有95头（66.4%）血清阳性。对这头持续感染公牛所生的61头小牛进行病毒学研究发现，有两头持续感染，但其他小牛健康且未感染。得出的结论是，这头公牛的精液是“清洁”牛群瘟病毒感染的潜在来源。
