Adejinmi J O, Akinboade O A
Department of Veterinary Microbiology and Parasitology, University of Ibadan, Ibadan, Nigeria.
Afr J Med Med Sci. 2012 Dec;41 Suppl:55-60.
Sizes and developmental viability of sequentially oviposited eggs of up to 12th day oviposition by dog ticks Rhipicephalus sanguineus and Haemaphysalis leachi leachi were studied. The mean length and breadth of eggs oviposited on days 1 and 2 were greater (0.45 +/- 0.111 and 0.44 +/- 0.042) than those of subsequent ovipositions. The eclosion periods of eggs laid from 7th to 12th day of oviposition were progressively shorter (17, 16, 14 and 19, 17, 0 days) than those of eggs laid on days 1 and 2 (20 and 22 days) by R. sanguineus and H. leachi leachi, respectively. The percentage mortality of eggs of days 11 and 12 oviposition (70.3% and 100%) was significantly higher than that of earlier ovipositions (9.6% and 31.7%) for R. sanguineus and H. leachi leachi, respectively. The numbers of larvae which engorged on rabbits after hatching from eggs of 11th and 12th day oviposition (43 and 0) were significantly fewer than those which hatched from eggs of days 1 and 2 (79 and 63) for R. sanguineus and H. leachi leachi, respectively. A total of 383 larvae of R. sanguineus engorged on rabbits compared to 225 larvae of H. leachi leachi. It is concluded that eggs of early ovipositions of R. sanguineus and H. leachi leachi are longer and wider and more viable than those laid later in the oviposition cycle. The significance of these findings in terms of hatchability of eggs is discussed.
研究了血红扇头蜱和李氏血蜱在产卵至第12天期间依次产下的卵的大小和发育活力。第1天和第2天产下的卵的平均长度和宽度更大（分别为0.45±0.111和0.44±0.042），大于随后产下的卵。血红扇头蜱和李氏血蜱在产卵第7天至第12天产下的卵的孵化期分别比第1天和第2天产下的卵（分别为20天和22天）逐渐缩短（分别为17、16、14天和19、17、0天）。血红扇头蜱和李氏血蜱在产卵第11天和第12天产下的卵的死亡率（分别为70.3%和100%）显著高于早期产下的卵（分别为9.6%和31.7%）。血红扇头蜱和李氏血蜱在产卵第11天和第12天产下的卵孵化后在兔子身上饱血的幼虫数量（分别为43和0）显著少于第1天和第2天产下的卵孵化后的幼虫数量（分别为79和63）。总共383只血红扇头蜱幼虫在兔子身上饱血，而李氏血蜱有225只幼虫饱血。得出的结论是，血红扇头蜱和李氏血蜱早期产下的卵比产卵周期后期产下的卵更长、更宽且更具活力。讨论了这些发现对于卵孵化率的意义。
