328 
J. W. CONNAWAY. 
ORIGINAL ARTICLES. 
TEXAS FEVER. 
EXPERIMENTS MADE BY THE MISSOURI EXPERIMENT STATION 
AND THE MISSOURI STATE BOARD OF AGRICULTURE, IN CO¬ 
OPERATION WITH THE TEXAS EXPERIMENT STATION, IN 
IMMUNIZING NORTHERN BREEDING CATTLE AGAINST TEXAS 
FEVER FOR THE SOUTHERN TRADE. 
By J. W. Connaway, Veterinarian Missouri Experiment Station, 
and M. Francis, Veterinarian Texas Experiment Station. 
(Continued from page 256.) 
“COLLEGE STATION.”—6 HEAD SPECIAL EXPERIMENT CATTLE. 
This lot consisted of one pure bred Shorthorn bull and five 
high grade Shorthorn heifers. They were about ten months of 
age, and were raised in Cooper and Boone counties, Missouri. 
They arrived at the Texas Experiment Station in good condi¬ 
tion January 1st, 1899. 
On Jan. 7th each received subcutaneously 1 cc. of defibri- 
nated immune blood from a grade Shorthorn cow on which 
w T ere a considerable number of ticks (B. bovis) in various stages 
of development. The calves were kept in a dry lot, in which 
there were no ticks, and were not allowed to come in contact 
with Texas cattle, or tick infested grounds, until April nth. 
They were examined regularly and carefully for ticks. In doing 
this each one was turned on its back to allow a thorough exam¬ 
ination. All the heifers had white skin along the belly, so that 
it was exceedingly improbable that any ticks were attached to 
them and escaped notice, until they were sent to the pasture in 
April. Their diet at the north had consisted of hay, ground 
corn, oats and bran. This was gradually changed to cotton seed 
meal, bran and oats, and cotton hulls. They were fed regularly 
all they would eat. Daily temperature records were made from 
Jan. 7th until August 31st. The changes in the blood were 
determined by the “ hsematokrit.” The blood was examined 
