THE SHEEP KED, MELOPHAGUS-OVINUS L .1. DISSEMINATION POTENTIAL
THE SHEEP KED, MELOPHAGUS-OVINUS L .1. DISSEMINATION POTENTIAL
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DOI：
10.1017/s0031182000021302
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发表时间：
1958-01-01
期刊：
影响因子：
2.4
通讯作者：
TETLEY, JH
中科院分区：
文献类型：
--
作者：
TETLEY, JH
定义了复杂的 ked-sheep 模式的组成部分，对 ked 的传播具有重要意义。研究发现，一只羊的传播潜力（羊毛表面的种群百分比）始终大于另一只羊。明亮的阳光导致传播潜力增加，尤其是第一只羊。结论是刺激因素是直接暴露在阳光下的羊毛温度升高。造成传播潜力差异的一个或多个因素是由于相似程度的温度变化叠加在本质不同的羊毛上。两只羊的性别表现相似。Keds 能够在两只羊之间轻松转移。然而，当它们集中在传播潜力较高的羊身上时，两羊系统的种群数量迅速下降；当它们被放置在传播潜力较低的羊身上时，两羊系统的数量就会增加。大约有一半的病毒离开了具有高传播潜力的绵羊，但没有到达第二个宿主。因此，它起到了消毒剂的作用。鸟类和宿主的捕食被认为是导致种群变化的因素。
Components of the intricate ked-sheep pattern, of significance in dissemination of the ked, are defined. It was found that the dissemination potential (percentage of population on the fleece surface) on one sheep was constantly greater than on a second. Bright sunshine caused an increase in the dissemination potential, particularly on the first sheep. It was concluded that the stimulating factor was a rise in the fleece temperature in regions directly exposed to the rays of the sun.The factor or factors causing differences in dissemination potential arose from similar degrees of temperature change being superimposed on inherently different fleeces. The sexes behaved similarly on both sheep.Keds were able to transfer readily between the two sheep. However, when they were concentrated on the sheep with a high dissemination potential, the population of the two-sheep system declined rapidly; when they were placed on the sheep with a low dissemination potential, the population of the two-sheep system increased. Approximately half of the keds leaving the sheep with a high dissemination potential did not reach a second host. It thus acted as a disinfecting agent.Bird and host predation were discounted as factors in causing ked population change.