Poisoning of cattle by Tetrapterys multiglandulosa in Mato Grosso do Sul, Brazil

Pesquisa Veterinária Brasileira

Alonso, Luiz A.⁴  Lemos, Ricardo A.A.¹  Ravedutti, Juliana¹  Barros, Claudio S.L.³  Carvalho, Nilton M.²  Cunha, Taila G.¹ 

[1] UFMS, Campo Grande;Universidade Federal de Mato Grosso do Sul, Campo Grande;Universidade Federal de Santa Maria, Santa Maria;Agência Estadual de Defesa Sanitária Animal e Vegetal, Taquarussu

关键词: Poisonous plants;    Tetrapterys multiglandulosa;    Malpighiaceae;    plant poisoning;    cardiomiopathy;    abortion;    diseases of cattle;    pathology.;   

DOI  :  10.1590/S0100-736X2006000300002

来源: Colegio Brasileiro de Patologia Animal-CBPA

【 摘 要 】

Two outbreaks of poisoning by Tetrapterys multiglandulosa in cattle and the experimental reproduction of the toxicosis in sheep are described. Both outbreaks occurred on the same farm in the municipality of Bataiporã, state of Mato Grosso do Sul, Brazil. The first outbreak occurred in July-October 2004 and involved a cattle population at risk of 290 pregnant cows, which were introduced into a 60 hectare pasture with a legal reservation area heavily infested by T. multiglandulosa. Of these, 230 cows (79.3%) aborted, had stillbirths or delivered weak calves that died few days after birth. Seven cows died, and one cow and a 10-day-old calf were necropsied. The second outbreak occurred in September-October 2005, 40 days after 285 2-year-old heifers were introduced into the same pasture infested by T. multiglandulosa and where the first outbreak had occurred in the previous year. Nine heifers got sick and died, and three of then were necropsied. Clinical signs of affected cattle, including a 10-day-old calf, were marked lethargy, loss of weight with distension of the abdomen (ascites), subcutaneous dependant edema, distended and pulsating jugular veins, dyspnea and cardiac arrhythmia. Necropsy findings included a round and dilated heart with whitish and firm areas in the myocardium, and changes related to cardiac failure such as cavitary edema, nutmeg liver, pulmonary edema, a large blood clot in the left ventricle. Histopathological changes included necrosis and fibrosis in the myocardium, chronic passive hepatic centrolobular congestion, pulmonary edema, and spongy degeneration in the white matter of the brain. Experimental sheep died 29 (Sheep 1) and 35 (Sheep 2) days after being fed average daily doses of T. multiglandulosa corresponding to 14g/kg (Sheep 1) and 7,5 g/kg (Sheep 2) per day. Clinical signs were observed from the 7th day (Sheep1) and the 4th day (Sheep 2) of the experiment and included tachycardia, arrhythmia, lethargy and head pressing. Necropsy and histopathologic findings in both experimental sheep were very similar to those observed in affected cattle of the two spontaneous outbreaks. Index

【 授权许可】

CC BY-NC