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r., ` <br />_~_ <br />7. Major Poisonous Plants to Livestock That May Cause Poisoning <br />Common <br />Name <br />broom snakeweed <br />Effect and symptoms <br />Poisoning is not common <br />abortion in cattle or m <br />sporadic and will occur <br />material is consumed in <br />Common <br />Name <br />narrowleaf poisonvetch <br />Effect and symptoms <br />Season <br />Scientific Name Dangerous <br />Xanthocephalum when forage <br />sarothrae is scarce <br />Loamy Plains 116 <br />Animals <br />Affected <br />cattle- <br />sheep <br />but will occur on overgrazed ranges. Causes <br />ay produce weak underweight calves. Losses are <br />when 10 to 20 percent of the body weight of green <br />1/2 to 20 weeks. <br />Season Animals <br />Scientific Name Dangerous Affected <br />Astragalus pectinatus <br />early in cattle <br />spring when ' <br />forage is <br />scarce. <br />Poisoning is associated with selenium poisoning. When plants are crushed in <br />the hand, a sulfurous odor is given off. Poisoning is cumulative. Poison- <br />ing can cause alkali disease (the chronic disease) which develops from <br />eating small amounts of selenium-bearing vegetation over an extensive <br />period of time or poisoning can cause blind staggers (the acute disease) <br />which results from feeding on relatively large amounts of selenium in a <br />short time. In acute cases of selenium poisoning, animals walk aimlessly <br />into objects. "Blind staggers" or alkali disease are names given for the <br />disease. Hoofs grow abnormally with the formation of deep rings. The hair <br />falls out--especially the mane and tail of horses. Recovery of animals <br />affected may take several months or years, even after being placed on good <br />forage. <br />Season Animals <br />Common Scientific Name Dangerous Affected <br />Name <br />silky crazyweed Oxytropis sericea A11 seasons but chiefly <br />mainly when horses <br />forage is <br />scarce. <br />