Pyrexia in response to Rhipicephalus appendiculatus infestation in calves.
Bos taurus calves free from tick-borne diseases were prophylactically treated with oxytetracycline hydrochloride and phenamidine isothionate 40% (w/v) injections and infested twice with adult Rhipicephalus appendiculatus ticks. Mono- and diphasic temperature rises were observed during primary and secondary exposures respectively with the peak occurring when the ticks were completing engorgement. However, the first rise in the secondary infestation occurred well before repletion and was associated with a hypersensitivity state. The feeding performance, viability and fecundity of female ticks were impaired during the secondary exposure.
D000578:Amidines / Q000627:therapeutic use*; D000818:Animals; D001550:Benzamidines / Q000627:therapeutic use*; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology / Q000517:prevention & control; D005247:Feeding Behavior; D005260:Female; D005334:Fever / Q000209:etiology / Q000662:veterinary*; D008297:Male; D010118:Oxytetracycline / Q000627:therapeutic use; D010647:Phenyl Ethers / Q000627:therapeutic use*; D013984:Tick Infestations / Q000662:veterinary*; D013986:Tick Toxicoses / Q000662:veterinary; D013987:Ticks / Q000502:physiology
D000578:Amidines; D001550:Benzamidines; D010647:Phenyl Ethers; C005402:phenamidine isethionate; D010118:Oxytetracycline