Barker R W, Nagardeolekar M, Stricker K W, Wright R E
Department of Entomology, Oklahoma State University, Stillwater 74078.
J Med Entomol. 1990 Jan;27(1):51-6. doi: 10.1093/jmedent/27.1.51.
Eight Hereford heifer calves were infested 28 times over a 64-d period with approximately 49,560 Dermacentor albipictus (Packard) larvae per calf. The fecundity of partially engorged and small, fully engorged female ticks, prematurely removed by grooming behavior of the calves, were compared. A total of 3,532 females of various engorged weights was collected from all calves, resulting in a mean female tick yield of 1.78% based on the number of larvae used for all infestations. The ratio of partially to fully engorged females was 1:16. Female oviposition success was 96%. The mean (+/- SE) values for female weight, number of larvae, and percentage larval eclosion of 50 partially engorged females that ranged in weight from 54 to 397 mg was 174 +/- 99, 1,272 +/- 931 and 85 +/- 14, respectively. The correlation between preoviposition weight and number of larvae from partially engorged females was highly significant (r = 0.95, P less than 0.0001). A prediction model (Y = -354.6 + 9.07X) showed that the preoviposition weight of partially engorged females and larval fecundity from a separate study was highly correlated (r = 0.92, P less than 0.0001). There was no significant difference between mean values of larval numbers and percentage eclosion for partially engorged and small, fully engorged females of similar weight.
在64天的时间里，8头赫里福德小母牛犊每头被约49560只白纹革蜱（帕卡德）幼虫叮咬28次。比较了因犊牛梳理行为而提前移除的部分饱血和小的、完全饱血雌蜱的繁殖力。从所有犊牛身上共收集到3532只不同饱血重量的雌蜱，基于所有感染所用幼虫数量，雌蜱平均产出率为1.78%。部分饱血雌蜱与完全饱血雌蜱的比例为1:16。雌蜱产卵成功率为96%。50只体重在54至397毫克之间的部分饱血雌蜱的雌蜱体重、幼虫数量和幼虫孵化率的平均（±标准误）值分别为174±99、1272±931和85±14。部分饱血雌蜱产卵前体重与幼虫数量之间的相关性非常显著（r = 0.95，P < 0.0001）。一个预测模型（Y = -354.6 + 9.07X）表明，部分饱血雌蜱的产卵前体重与另一项研究中的幼虫繁殖力高度相关（r = 0.92，P < 0.0001）。体重相似的部分饱血雌蜱和小的、完全饱血雌蜱的幼虫数量平均值和孵化率百分比之间没有显著差异。
