. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. FiG. 16.—Sheep Xo. i68 at , showing weakness in forelegs after being fedDeath Camas (Zygadenus venenosus). {After Marsh, C. Dwight, Clawson, A. B. andMarsh, Hadleigh: Zygadeus or Death Camas, Bulletin 125, U. S. Department of Agricul-ture, 1915, Plate V, Fig. i.) raska westward to the Pacific coast. The chief period of danger is inMay and June when its dark green leaves are attractive to stock. Cattleare susceptible to the poison and some deaths have been reported, but
. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. FiG. 16.—Sheep Xo. i68 at , showing weakness in forelegs after being fedDeath Camas (Zygadenus venenosus). {After Marsh, C. Dwight, Clawson, A. B. andMarsh, Hadleigh: Zygadeus or Death Camas, Bulletin 125, U. S. Department of Agricul-ture, 1915, Plate V, Fig. i.) raska westward to the Pacific coast. The chief period of danger is inMay and June when its dark green leaves are attractive to stock. Cattleare susceptible to the poison and some deaths have been reported, butcases among cattle are uncommon. Swine are said to eat the bulbswithout bad results, but horses are poisoned. Sheep are the animals mostfrequently poisoned (Figs. 16 and 17). Detailed experiments by agentsof the United States Department of Agriculture show that the principalsymptoms are salivation, nausea, muscular weakness, coma and sometimes MONOCOTYLEDONS AS POISONOUS PLANTS 49. Fig. 17.—Sheep No. 168 at , when unable to rise after being fed DeathCamas (Zygadenus venenosus). (After Marsh, C. Dwight, Clawson, A. B., and Marsh,Hadleigh: Zygadenus, or Death Camas, Bulletin 125, U. S. Department of Agriculture1915, Plate V, Fig. 2.) /OS n ^\/o/ / A A \ X \ \ V v^ ?A . \ ?v. --. / ¥>~— /oo Pig. 18.—Curve of temperature of sheep No. 291 fed on Death Camas {Zygadenusvenenosus. {After Marsh, C. Dwight, Clawson, A. B. and Marsh, Hadleigh: Zygadenus,or Death Camas, Bulletin 125, U. S. Department of Agriculture, 1915, p. 26.) 50 PASTORAL AND AGRICULTURAL BOTANY attacks of dyspnoea (Fig. i8). The toxic dose varies according to theconditions of feeding. In drenched animals, it may be put at about one-half a pound for an animal weighing a hundred pounds and in fed animals POO /so/ao /70 /60/5C ^ /20\ //O \r eo 60 SO JO so \ \ 1 I / \ \ \ 1 ^ V ?v/ f ^ ^ V ^ ^ V ^ Fig. 19.—Curve of respiration of sheep No. 174 fed on Death Camas, Zygadenus
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