Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever Page: 100
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TEXAS OR SOUTHERN CATTLE FEVER.
Experiment 7 (to ascertain whether the infection of 1889 survived the
winter).-For this purpose fields I and III of 1889 were thrown to-
gether by removing the intervening fences and the whole designated
field I (see Fig. 5). The little stream was likewise fenced off in July to
prevent any infection from field VI reaching it. A number of animals
were pastured on this field.
May 26, 1890.-No. 74 (heifer, 2 years.) Transferred to field II September 25.
May 26, 1890.-No. 91 (heifer, 3 years.) Transferred to field VI October1.
July 4, 1890.-(Stream fenced off, as field VI is now used for the first time.)
July 9, 1890.-No. 130 (cow, 5 years).
August 25, 1890.-No. 97 (bull, 1 year).
During the summer no ticks appeared in this field, so that it was
evident that they had not survived the winter. No disease appeared
in any of the animals exposed.
Experiment 8 (to ascertain whether the disease introduced by Texas
and that introduced by North Carolina cattle are the same).-Four
heifers were removed from their pasture near Houston, Tex., June 30,
and sent by express to the station, whrre they arrived July 4. Hence,
they were but four days off the Southern pasture before they were
placed in field II (see Fig. 5). The heifers were in rather poor condition
and all well supplied with cattle ticks of all stages. The field corre-
sponded with field II, of 1889, but it was slightly enlarged so as to
include about -6 of an acre. The field thus contained-
(a) Texas cattle with ticks:
No. 124 (heifer, 2 years).
No. 125 (heifer, 3 years).
No. 126 (heifer, 4 years).
No. 127 (heifer, 5 years). All placed in field II, July 4.
(b) The native cattle were exposed in the following order:
July 4, No. 128 (cow, 12 to 14 years). Dies September 1.
July 5, No. 80 (cow, 7 years). Killed August 28.
July 5, No. 82 (calf, 5 months). Diseased, but recovered.
July 5, No. 107 (heifer, 1 year). Diseased, but recovered.
July 5, No. 129 (heifer, 2 years). Dies August 29.
August 30, No. 139 (cow, 6 years). Dead September 13.
September 25, No. 74 (heifer from field I). Dies October 16.
Septembcr 25, No. 62 (N. C. heifer of 1889). Exposure negative.
As regards the cattle ticks, the following observations were made,
On July 30, only a few adults were still attached to the Texas cattle,
the rest having disappeared. On October 20, only very few young
ticks were still found on the surviving cattle, and eight days later they
had all disappeared.
Any differences between the disease in this and the North Carolina
fields could not be found.
Experiment 9 (exposure to North Carolina cattle with ticks. Gen-
eral control field for 1890).-Field VI was chosen for this purpose. It
covers 1 acres, and is fenced off from the stream. Between it and
the other fields (I, IV) is a strip of land containing the stream bed.100
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Smith, Theobold & Kilborne, Fred Lucius. Investigations into the Nature, Causation, and Prevention of Texas or Southern Cattle Fever, book, 1893; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth143538/m1/100/?q=%221863%22&rotate=180: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting University of Texas Health Science Center Libraries.