Studies on Ticks of Veterinary Importance in Nigeria—V. The Size, Hatching Patterns and Mortality Rates of Eggs of Amblyomma Variegatum (Fabricius 1794)

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Abstract
The lengths, breadths and areas of eggs oviposited at different times by female ticks (A. variegatum) [on cattle] of weight 2-3 g and 0.5-1 g were compared. The hatching patterns and mortality rates of different ovipositions of female A. variegatum of weight 2-3 g were studied at various incubation temperatures. The eggs produced by 2-3 g ticks were generally longer, broader and with a greater area than those produced by female ticks of weight 0.5-1 g. The hatching pattern was influenced only by temperature and not by the order of oviposition of the eggs. The period of completion of all hatchings and the day of peak hatching varied according to the temperature at which the eggs were incubated. The occlusion periods of the eggs varied with their order of oviposition. It was longest in the 1st oviposition and shorter in the subsequent ones. Temperature also influenced the rate of mortality of the eggs. Mortality was low among eggs incubated at 24.degree. C and rotational temperature.

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