Intoxicação espontânea por Amaranthus hybridus (Amaranthaceae) em bovinos no sul do Rio Grande do Sul

Abstract

in southern Rio Grande do Sul, Brazil. The morbidity rate observed was 48.33%, the mortality rate was 41.66% and lethality rate was 86.20%. The diagnosis of A. hybridus poisoning was made based on the epidemiological data, clinical signs, macroscopic and histological lesions characteristic of intoxication by nephrotoxic plants and by the presence of large amounts of the plant in the area where cattle were placed. Invasion of Brachiaria sp. pasture by A. hybridus alerts for the possibility of the occurrence of poisoning not only in stubble areas with lack of forage. In the case reported here there was abundant forage availability in the area where the outbreak occurred. Favorable climatic conditions and fertile soil for planting pasture, probably favored the growth of this invasive species. RESUMO.-Descreve-se um surto de intoxicação por Amaranthus hybridus ocorrido em bovinos em fevereiro/março de 2013 na região sul do Rio Grande do Sul. A morbidade foi de 48,33%, a mortalidade de 41,66% e a letalidade 86,20%. O diagnóstico da intoxicação por A. hybridus foi baseado nos dados epidemiológicos, sinais clínicos, achados de necropsia e lesões histológicas características da intoxicação por plantas nefrotóxicas e pela presença da planta em grande quantidade na área onde estavam os bovinos.A invasão da pastagem de Brachiaria sp. pela planta alerta para a possibilidade da ocorrência da intoxicação não somente em áreas de resteva com carência de forragem, uma vez que no surto relatado neste trabalho havia abundante disponibilidade de forragem nas áreas onde os bovinos se intoxicaram. No presente caso provavelmente as boas condições climáticas e o solo fertilizado para a plantação da pastagem favoreceram o crescimento da invasora. TERMOS DE INDEXAÇÃO: Plantas tóxicas, caruru, Amaranthus hybridus, Amaranthaceae, plantas nefrotóxicas, intoxicação por plantas, bovinos.

Evolution of cattle intoxications in southern Rio Grande do Sul: Spatial distribution and trends over 42 years

“…invaded pastures of Brachiaria sp. and, therefore, there was no shortage of forage, indicating that this intoxication can also occur in situations of adequate food quantity but with a large infestation by the plant that is palatable for cattle , Ferreira et al 1991, Stigger et al 2013).…”

“…represented 3.5% of diagnoses of toxic diseases in the first 21 years and 2% in the subsequent 21 years, with no significant variation in the percentage of diagnoses in the two studied periods. Despite not being an important toxic plant from the point of view of the number of outbreaks, it is associated with high lethality that can reach 100% (Stigger et al 2013). This plant can grow on fertilized land, and outbreaks can occur when cattle are grazed on crop stubbles that have not been completely harvested, especially when there is drought and lack of fodder in summer and autumn (Ferreira et al 1991, Lemos et al 1993, Torres et al 1997.…”

Chenopodium quinoa Willd. and Amaranthus hybridus L.: Ancestral Andean Food Security and Modern Anticancer and Antimicrobial Activity

“…There is evidence that A. hybridus has a beneficial effect on the gut microbiota that underlies its ethnomedical uses concerning digestive system conditions [78]. It is also worth mentioning that A. hybridus and other Amaranthus species can be poisonous to cattle, exhibiting nephrotoxicity [79]. Traditional medicinal uses for A. hybridus are shown in Table 5.…”