LARKSPUR POISONING OF LIVE STOCK. 



59 



Tabi^ X. — Bummary of feeding experiments upon sheep with Delphinium 



andersonii, 1911. 



No. of animal. 



"Weight of 

 animal— 



Amount 



of plant 



fed. 



Date of 

 feeding. 



Part of 

 plant 

 fed. 



Amount 

 fed to 100 



pounds 

 of animal 



weight. 



Location 

 from which 

 plant fed was 



obtained. 





Before. 



After. 



155. . . 



Pounds 

 131 



153 



Pounds. 

 126 



149 



Pounds. 

 11.3 



12.1 



1911. 

 Aug. 11-12 



Aug. 14 



Roots.. 

 ...do... 



Pounds. 

 1 



1.4 



McD owe Us 



136 



Creek, 

 Oreg. 

 Do. 







1 Dry weight. 

 EXPERIMENTAL FEEDING OF DELPHINIUM BICOLOR TO SHEEP IN 1912. 



The preceding experiments of iQeding Delphiniimh barbeyi, D. 

 menBiesii, and D. andersonii with negative results rendered it ex- 

 tremely probable that none of the species of larkspurs are poisonous 

 to sheep. It was assumed that probably Delphinium bicolor, the 

 Montana low larkspur, would be harmless. In the summer of 1912 

 two sheep were fed upon this plant, Table XI, giving the details. 

 No symptoms of poisoning occurred in either case, although they 

 received much more than it is at all probable they could obtain 

 when grazing. 



Table XI. — Summary of feeding experiments upon sheep with Delphinium 



bicolor, 1912. 



»No. of 

 animal. 



Weight of 

 animal. 



Amount of 

 plant fed. 



Date of feed- 

 ing. 



Part of plant fed. 



Amount 

 fed to 100 



pounds 

 01 animal 



weight. 



Location from 

 which plant 

 fed was ob- 

 tained. 



160. 



177. 



Pounds. 

 92 



51-4 



Pounds. 

 23.5 



16.5 



June23-July2 

 July 5-12 



Leaves, stems, fruit, and 



some flowers. 

 Leaves, stems, and fruit 



Pounds. 

 25.54 



32.35 



Geo. Hughes's. 

 Do. 



PART III.— RESULTS AND CONCLUSIONS. 



ANIMALS AFFECTED BY LARKSPUR POISONING. 



Cattle.— The experimental work resulted in the confirmation of 

 the general opinion of the poisonous effect of the larkspurs upon 

 cattle. 



Horses. — Horses may be poisoned by larkspur, but they do not 

 voluntarily eat enough of the plants to harm them. They eat more 

 or less of it when grazing, but there is no evidence that they are ever 

 poisoned by it under ordinary range conditions. 



Sheep. — As the result of the feeding experiments with Delphinium 

 harheyi and Delphinium mensiesii at the Mount Carbon station, the 

 definite conclusion was reached that these two plants do not have 



