Tick infestations and their effects on growth of Bos indicus × Bos taurus cattle in the wet tropics

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Abstract
The effects of bi-monthly dipping with Promacyl and no dipping on tick numbers and liveweight gain of young Bos indicus x Bos taurus cattle grazing tick infested improved pastures were compared in three experiments over three years at Utchee Creek, northern Queensland. Reduction in weight gains, due to ticks, of 24 and 30 kg (P 0.05) to mean tick counts. When cattle were changed from an undipped to dipped treatment, they gained 18 kg more (P < 0.01) over six months than those changed from dipped to undipped. The latter groups carried more ticks than corresponding undipped cattle in the first two experiments.