Press Bulletin No. 38.
Practical Results of the
TEXAS FEVER INOCULATIONS.
(By DR. CHARLES F. DAwsON, Station Veterinarian.)
On January 15th, 1908, twenty-five thoroughbred short-
horn cattle, ranging in ages from six to eighteen months,
were received at the station for protective inoculation
against Texas fever.
They were purchased in Kentucky by Mr. S. H. Gaits-
kill, of McIntosh, for himself, the station, Mr. Z. C.
Chambliss, of Ocala, Col. Miller, of Gainesville, and Mr.
W. N. Camp, of Albion.
They were each inoculated with 1 cc. of blood, drawn
from a native Jersey cow, on January 81st. Within a
week they were all showing a fever as the result of the
inoculation, and one died of the fever on Feb. 12th. At
the end of February they all showed another temporary
fever for a few days. Sixteen were shipped to Messrs.
June 1st, 1903.
Gaitskill and Chambliss, on March 5th, and the re-
maining eight, four heifers and four bulls, were retained
by the station.
The four bulls retained by the station were kept penned
and were inoculated a second time with 2 cc. of blood
from the same native cow on April 18th. They showed
no particular sickness therefrom, but all had a mild at-
tack of'the fever as a result.
The following circular letter of caution was sent to each
/ owner immediately after shipment from the station:
To whom it may concern: "Although the cattle inoc-
ulated on this station as a preventive against a future
fatal attack of Texas fever are immune to a certain ex-
tent, it must not be taken for granted that the immu-
nity conferred is absolute. Owners are cautioned not to
allow their cattle recently received from the station to
graze upon ticky pastures or to come in contact with na-
tives until they have been artificially infested with young
ticks sent them from the station. This we hope to do in
about three weeks. Meanwhile, the cattle should be kept
penned in a place in which there have been no native cat-
tle for at least four months. After the animals have
been artificially infested with the young ticks.spoken of
above, they should still be kept separated and on a tick-
free pasture, or in a pen, for at least a month. After
this time, even, they should not be allowed access to in-
fested pastures. These restrictions will have to be kept
up throughout the first summer, after which time, only
the care as such cattle demand will be necessary. Ex-
cessive numbers of ticks are a dead loss to all animals,
good or bad."
it State papers please copy or notice.
The following letters from the gentlemen interested
show the management and results of the inoculations.
"The Shorthorns owned by the College have been sub-
jected to tick infestation since they were inoculated last
winter and I will say that they have withstood the heav-
iest tick infestation I have seen in twelve years experi-
ence. Very truly,
C. M. CONNER.
Professor of Agriculture, Experiment Station."
"Replying to your request of the 21st inst., I do not
think my calves could do better, they all have a fair sup-
ply of ticks on them. For some months, possibly two
months or more, they did not appear to thrive and gain
flesh. I did not test for fever, but I am quite sure that
they were having fever during this time, arising from the
first tick infection. They are now on grass with other
cattle, getting no feed except grass, and are gaining flesh
and doing as well as I could possibly ask. I consider the
blood inoculation a complete success.
S. H. GAITSKILL.
"The six Shorthorn cattle inoculated at the Station for
us had a slight infestation of ticks about 60 days after in-
oculation and some of them were quite sick of fever.
Since, they have most of them shown fever twice, each
time being lighter except in the case of the 18 mos. old
bull, Alhambra, which came down suddenly on night of
the 28rd, and died on May 25th, after having two pre-
vious attacks and we believing them all to be immune.
The bred heifer has had plenty of ticks but has given
least trouble of any and we feel quite sure has niot lost her
calf. Yours truly,
Z. C. CHAMBLISS.
It will be noted that the cattle have been infest-
ed with ticks on ordinary pastures and we are rather sur-
prised that more of them have not died. In Texas the
loss was seven per cent. more in cases where the inocu-
lated animals were allowed on ticky pastures the first
summer. The loss in unprotected northern cattle turned
upon the same ranges was from 50 to 90 per cent.