隐孢子虫感染奶牛的卵囊排出规律

Oocysts Excretion Regulation in Cryptosporidium Infested Cow

对26 头自然感染隐孢子虫奶牛的卵囊排出情况作了连续21 个月的观察。结果表明,阳性犊牛(n =12) 转阴率最高,为50.00% (均为感染强度+ 或者);阳性成母牛(n = 9) 转阴率次之,为11.11% ;阳性育成牛(n= 5) 转阴率为0.00% 。阳性奶牛中,高强度感染(或)者多为长期带虫,持续从粪便中排出卵囊。

Oocysts excretion regulation of 132 Cryptosporidium infested cow was observed for successive 21 months in a cow farm of Hefei. Cryptosporidium oocysts were found in 26 faecal specimens of cow with the infestation rate being 19.70%. The Cryptosporidium had been identified as Cryptosporidium muris. The results showed that the negative conversion rate in infested calf, cow and heifer was 50.00%, 11.11% and 0.00%, respectively. The individuals with intensive infestation must be the carrier of Cryptosporidium and always excrete oocysts from faeces.