4 BULLETIN 1212, U. S. DEPARTMENT OF AGRICULTURE. 
EXPERIMENTAL WORK. 
During the summer of 1922 feeding experiments with Asclepi 
ertocarpa were made on 2 head of cattle and 19 sheep. The materi 
mixed with hay, was fed to the cattle, 3 of the sheep were fed in 
similar way, 2 of them received it with hay and bran, and the other 
14 were given the material by balling gun. In all cases the materia 
was fed dry but the dosage was computed in terms of the gree 
plant. a Table 1 the experimental work with the plant is sum 
marized. 
TABLE 1.—Summary of feeding experiments with Asclepias eriocarpa, Salina 
(Utah) Paperiment Station, 1922. 
| 
Animal. Weight of| 
plant, 
estimatec 
Date of Method of Part of as green Result co ang date 
feeding. feeding. |plantused.| plant eae vile ant 
Designation. |Weight. per 100 collections 
pounds of i 
animal. 7 
, 
Cattle: Pounds.) 1922 Pound. 
No. 938..... 400 Sept. 18...| In hay....} Leaves... O52. | Very.sick..*- .| Fresno County 
Calif., Octam 
13, 1921. 
No. 928..... 408 Sept. 2h Neve: (6 Ko Yam ee) ee co oa 0.1 | Symptoms....| Do. i 
Sheep: 4 
No. 664... .. 111 June 20....| Balling |....- doc. 0.5 | Death 522.25: Do. Phy 
gun is 
No: 663 -.2217103;;75.) une. 24-25] 2 2 “aloe i ad bee dose 0.25 | Possible symp- Do ‘, 
oms. 
No. 666..... 9375 | dune 262-4): 2—- do2es.|2 2s (op ae 0.3 | Death: -- 32 -ce Do > 
No. 667....- 142.5 | June 23-29} In hay....]....- Goh 0:2) (Notisieke. #-- == Do ; 
No. 695....- 105 June 29....| Balling | Stems....- O$3a) Deaths. == = Do ; 
gun. ’ 
No. 685..... 1025500) ulna see ee do.2s Leaves.... 0:26.) Sick.5.2- 223253 Do. ' 
INorG72- = SOD, | uliyeSeees 2} eee doze Water 0362"), Not sick. 2222 Do. 3 
mark of 4 
leaves ? 
INO. 691ee 2. - 106220 | July 15e: see co Ko ee Leaves 0:25.) Very Sick. .2- Do. 
No. 651....- 115 July 19: . [ots da.t... Stems..... 0.1 | Probable Do. 7 
slight symp- is 
toms. 4 
No.683. .... - 1032.25 ||: Jilly: 24257 ote oe OSs. slos526 dos. 0-2. | Nofisick.---.-- Do. 4 
No. 680....- UAOS25, | Tul Qi eo oce fe dOzzas. Leaves....| 0.2 | Symptoms.... Do. 4! 
No. 662..... 98.75 | July 31....|....- a oipen a Wah eree doz... 0.21 | Not'sick.....-. Do by 
No: 572. -5.- 123 ATES it eee Osea Stems..... 0.21! Possible Do a 
symptoms. " 
No. 670..-.- 154-95) Ape 1! Sse dO. Leaves....| 0'22'| Death 2.2: Do. 
No. 668. ...- 103 Wupe Qe hee. dios) eee dO4:2- 0.2 | Symptoms.... Do. 
OOGHie 2: oe 103.25 | Aug. 16-18.| With hay.]..-.-. lop aeaae 0.3 | Depressed..... Do. 
No: 699...2. 118.5 | Anes 20-202|2 255. GOs tsa Geeoes 0.24 | Not’sick.:..... Do 
No. 662-3: 105 Aug 25.3) With: brane 222 Cons: 0.21/ Possible Do 
and hay. symptoms 
No. 675..... he do do... ee 0.4 | Sick..._- Do 
TYPICAL CASE OF SHEEP 691. 
Sheep 691, a ewe about 4 years old, weighing 106.25 pounds, was 
brought in from the pasture on July 12. She was kept under obser- 
ration until the feeding with Asclepias eriocarpa, which was made at 
2.12 p.m.on July 15. From the morning of July 13 to the morning 
of July 14 she was kept in the metabolism cage for the collection of 
urine. Regular clinical observations on temperature, pulse, and res- 
piration were made in the preliminary period. The feeding of dried 
plant was made by balling gun. Estimated as green plant this would 
have been 0.25 pound per hundredweight of animal. , 
On July 15 no symptoms appeared. 
