Many plants are poisonous to equines; the species vary depending on location, climate, and grazing conditions.In many cases, entire genera are poisonous to equines and include many species spread over several continents. Yellow mustard contains 15 calories, 1.1g carbohydrate, 0.5g fiber, and 0.9g fats. Weight loss is also common. Symptoms can include: frothing at the mouth; bloating; diarrhoea; and breathing problems. (We say this simply because we don’t want to put anyone’s livestock at risk.) Seeds of mustard family weeds can be toxic, so it’s best to graze or harvest early. Growing in heavy clay soil during the summer months, it should be removed from pasture to stop a horse eating it in large amounts. According to nutritionists, these nutrients are the source of energy. Pokeweed: Pokeweed (Phytolacca americana) is a commonly found weed in horse pastures and around fence lines.It grows erect, resembling a tree, and can reach up to 10 feet in height. Yew Brassica species is Ceriman, also commonly called Wild Mustard. But will it be ok to feed the horses this alfalfa, have not really seen it in the grass hay right next door. Bottom line: Mighty Mustard is not suitable for grazing by horses, cattle or pigs. thanks suz: Moderator: DrO: Posted on Wednesday, May 23, 2007 - 10:43 pm: Susan, I lifted this off the Texas Cooperative Extension Service: Description Tansy mustard is an annual cool-season forb growing to 2 feet tall. The stem is often purple or red in color and can reach a diameter of 4 inches. Pigweed and its relative lamb's quarters can cause kidney failure. Humans aren’t the herbivores cattle are and we don’t tend to eat as much mustard, still some caution is advised. What to do: There is no treatment, and any neural damage is permanent. ... Wild pot plants; Snotty Kleenex; ... "If we can eat it, most horses can eat it in relatively small amounts–less than one pound per day." Euthanasia is recommended if the horse is too debilitated to eat. Horses are unlikely to eat this plant unless there is no other food available. Sausage and mustard; Alcohol. Signs: Affected horses may appear to have tense or clenched facial muscles, and they are unable to bite or chew their food effectively. This plant can be annual, perennial or biennial and grows alternate leaves, 4 petaled flowers are usually yellow (but can be white, blue or purple), seedpods are broad and flat. Pigweed can be very toxic if eaten in large quantities. This weed seems to grow everywhere, from pastures to vegetable gardens, roadsides to barnyards. More well known as Wild Mustard, it is not a healthy plant for horses to be exposed to over a long period of time. One note: We’ve been told that the mustard’s too spicy for many animals, so they avoid eating it. Wild mustard can be palatable before it sets seed. 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