Barbara Cristina Mazzucatto

Intoxicação aguda por triclorfon em caprinos tratados com a dose terapêutica

The present study describes an outbreak of trichlorfon poisoning in goats from the State University of Maringa, campus Umuarama/PR that received orally the therapeutic dose of the active ingredient in question (100mg/kg). Fifty-three sheep had been treated with the same formulation/solution and no side effects were observed in any of these sheep medicated with triclorfon. But from 20 goats medicated with trichlorfon, eight goats showed, about 40 minutes after its administration, the classic clinical signs of ataxia, external lateral decubitus, drooling, tremors, constricted pupils, noisy dyspnea, involuntary urination and defecation, spastic paresis, bloat and tearing. Almost immediately after the detection of these signals, eight goats were medicated with 1% atropine sulfate (0.5mg/kg and fluid). Five of these goats received a second dose of atropine sulfate one hour after the first application because of some clinical signs such as muscle tremor still being present. Forty-eight to 72 hours after administration of trichlorfon, three of those five goats died. At necropsy we observed cyanotic mucous membranes, congestion of liver, spleen, kidneys and mesenteric vessels, filled gallbladder, emphysema, and reddish lungs. The results of this study call attention to the outbreak that occurred in adult goats in good clinical conditions and, above all, that they received the therapeutic dosage recommended on the manufacture label. This suggests a higher sensitivity of the species to the recommended dose of trichlorfon (100mg/kg) for goats.

Intoxicação de ovinos que receberam duas aplicações de closantel, na dosagem terapêutica (7,5mg/kg), com intervalo de 28 dias

This study reports poisoning in sheep wich have received two applications of closantel in therapeutic dosage (7.5mg/kg) within a preestablished 28-day period for effectiveness formulation. A high percentage of efficiency was observed after the first and second treatment, but around 72 hours after the second administration of closantel (D30), three sheep have showed mild apathy, anorexia, diarrhea, bilateral blindness, and dilated pupils without reaction. These three animals, were observed in the following 250 days, and the bilateral blindness remained. Numerous reports of animals poisoned by closantel emphasize that overdose and/or nutritional status of the animals are key factors to occur poisoning due closantel administration. However, in this experiment the signs of poisoning (mild apathy, anorexia, diarrhea and ophthalmic disturbance), observed in the three clinically healthy sheep, occurred when they received two applications of closantel (7.5mg/kg), in a interval of 28 days, highlighting the fact of obtaining a cumulative residual effect of closantel in the animal organism, caused by two consecutive applications, may also be a predisposing factor for sheep to demonstrate irreversible signs of intoxication.