博伦牛妊娠早期和中期间日锥虫实验感染的效果

G. Okech , E.D. Watson , A.G. Luckins , D.W. Makawiti
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引用次数: 11

摘要

在妊娠早期和中期,6头Galana和5头Orma Boran (boindicus)牛通过莫西格氏杆菌周期性传播感染间日锥虫KETRI 2501。4只怀孕的动物,每两种Boran型作为对照,在整个研究期间保持未感染。六头受感染的易感Galana Borans中有三只流产,而一只有死胎。没有一只耐锥虫的奥玛博兰牛流产,所有牛都怀孕了。所有对照动物都在足月产活小牛。导致易感博然牛生殖功能中断的机制尚不清楚,但可能涉及许多因素,包括贫血、体重减轻和感染后血浆黄体酮水平下降。由此可见,间日疟原虫感染破坏了易感的Galana Boran的妊娠维持,但不影响Orma Boran的妊娠维持,表明它们对间日疟原虫感染具有耐受性。
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The effect of experimental infection ofboran cattle in early and mid-pregnancy with Trypanosoma vivax

Six susceptible Galana and five trypanotolerant Orma Boran (Bos indicus) cattle were infected experimentally with Trypanosoma vivax KETRI 2501 by cyclical transmission using Glossina morsitans morsitans during early and mid-pregnancy. Four pregnant animals, two of each Boran type were used as controls and remained uninfected throughout the study period. Three out of the six infected susceptible Galana Borans aborted, whilst one had a stillborn calf. None of the trypanotolerant Orma Boran cattle aborted and all carried their pregnancies to term. All control animals produced live calves at term. The mechanisms leading to disruption of reproductive function in susceptible Boran cattle were not clear but could involve a number of factors, including anaemia, weight loss and post-infection decline of plasma progesterone levels. It is concluded that infection with T. vivax disrupts maintenance of pregnancy in susceptible Galana Borans but does not affect maintenance of pregnancy in the Orma Boran, demonstrating their tolerance to infection with T. vivax.

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