Krecek R C, Murrell K D, Douglass L W
Department of Parasitology, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, RSA.
Onderstepoort J Vet Res. 1990 Jun;57(2):133-5.
Assessments were made of the influence of several microclimatic variables on the availability of third-stage larvae of Ostertagia ostertagi, on pasture herbage. Variables most closely related to recovery of larvae from the lower herbage samples were: maximum air, mat and dung temperatures. Recovery of larvae from the upper portion of the herbage was closely correlated with dung temperature, sampling-time air temperature and maximum air temperature. Bearing in mind that the moisture threshold was maintained throughout the trial the results of this study suggest that under field conditions, larval movement of third-stage O. ostertagi larvae on herbage is regulated primarily by temperature.
评估了几个小气候变量对牧场上奥斯特他线虫第三期幼虫可用性的影响。与从较低牧草样本中回收幼虫最密切相关的变量是：最高气温、地表温度和粪便温度。从牧草上部回收幼虫与粪便温度、采样时气温和最高气温密切相关。考虑到在整个试验过程中保持了湿度阈值，本研究结果表明，在田间条件下，奥斯特他线虫第三期幼虫在牧草上的移动主要受温度调节。
