Svensson C
Veterinary Institute, Swedish University of Agricultural Sciences, Skara.
Acta Vet Scand. 1993;34(1):77-81. doi: 10.1186/BF03548226.
Faecal samples were collected 3 times a week for 6 weeks from 22 paripartal cows and for up to 15 weeks after birth from 27 calves in 3 herds, to determine the numbers of Eimeria oocysts excreted and the age at which the calves first excreted oocysts. Only low numbers of oocysts were excreted by the cows and no oocysts were detected in 93% of the samples. However, half the cows excreted oocysts at least once. The age at which the calves first excreted oocysts ranged from 2.5 to at least 15 weeks, and there was a significant difference between the herds in their mean age at first excretion. Oocysts of Eimeria alabamensis, E. auburnensis, E. bovis and E. ellipsoidalis were found in numbers ranging from 7 to 8450 oocysts per gram faeces. About 50% of the calves excreted oocysts before they were transferred to group pens. The primary source of infection of the calves was probably their penmates or the previous occupants of the pens, and the cows probably played a subsidiary role.
从3个牛群的22头临产母牛中，每周采集3次粪便样本，持续6周；从27头犊牛中，在出生后最多采集15周的粪便样本，以确定艾美耳球虫卵囊的排出数量以及犊牛首次排出卵囊的年龄。母牛排出的卵囊数量很少，93%的样本中未检测到卵囊。然而，一半的母牛至少有一次排出卵囊。犊牛首次排出卵囊的年龄在2.5周到至少15周之间，不同牛群首次排出卵囊的平均年龄存在显著差异。在粪便中发现了阿拉巴马艾美耳球虫、奥本艾美耳球虫、牛艾美耳球虫和椭圆艾美耳球虫的卵囊，每克粪便中的数量从7个到8450个不等。约50%的犊牛在转入群养栏之前就排出了卵囊。犊牛感染的主要来源可能是同栏伙伴或栏舍的前一批居住者，母牛可能起辅助作用。
