Emory milkvetch (Astragalus emoryanus var emoryanus) poisoning in chicks, sheep, and cattle.
A severe outbreak of Emory milkvetch poisoning in cattle and sheep occurred near Roswell, New Mexico, in the spring of 1975. Mortality averaged 2% to 3% and morbidity averaged 15% to 20%. Emory milkvetch collected from the infested area contained miserotoxin measured as 5 to 9 mg of NO2/g of plant (dry weight). Chicks fed extracts of Emory milkvetch showed toxic signs when fed one dose as 300 mg of NO2/kg of body weight, and died within 5 to 8 hours when fed milkvetch as 400 mg of NO2/kg. A sheep fed Emory milkvetch for 7 days in the form of 38 mg of NO2/kg/day developed signs of nitro poisoning on the 7th day. Cattle were poisoned or died when fed Emory milkvetch as 12 to 20 mg of NO2/ig for several days. The toxic signs observed in the field and under experimental conditions were similar.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000139:chemically induced* / Q000209:etiology; D002645:Chickens; D005260:Female; D005960:Glucosides / Q000506:poisoning*; D006027:Glycosides / Q000506:poisoning*; D009574:Nitro Compounds / Q000633:toxicity; D010936:Plant Extracts / Q000633:toxicity; D010939:Plant Poisoning / Q000209:etiology / Q000662:veterinary*; D010947:Plants, Toxic / Q000032:analysis; D011201:Poultry Diseases / Q000139:chemically induced*; D012756:Sheep; D012757:Sheep Diseases / Q000139:chemically induced*
D005960:Glucosides; D006027:Glycosides; D009574:Nitro Compounds; D010936:Plant Extracts; C020776:miserotoxin