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Wisconsin Dairymen's Association / Fortieth annual report of the Wisconsin Dairymen's Association : held at Beloit, Wis., November, 1911. Report of the proceedings, annual address of the president, and interesting essays and discussions relating to the dairy interests
(1912)

Hastings, E. G.
Tuberculin and its uses,   pp. 97-106 PDF (2.1 MB)


Page 101


Wisconsin Dairymen's Association.            101
the point of recovery or it may go backward to a certain degree, and
there remain stationary until a temporary weakening of the animal
through some cause or other enables it to gain headway again and
to progress rapidly. These animals in which the disease has ceased
to progress have been termed "ceased reactors" because it is believed
that while the disease is dormant in the body of the animal it will
not react to the test..
Table II.
May      I October September
'Os.   I    us        o0u.
I               -
z    I     t          -
I     i       1.
t    I      7        -
may        October    September      Klled
'07.         '07.        '08.     Oct. '08.
_            -           -
-             =     I     -
____             __      _   = __
= Reactors.
-= Non-reactors.
* LesIons.
In Table II are given some figures from Canadian experiments. It
will be noted that in the first test which was made of these animals
in May, 1905, all of them gave positive reactions. The same is true
in October, while in September, 1906, four of the animals did not
react. In May, 1907, but one of the animals reacted, while in October
of the same year none reacted to the test. In September, 1908, the ani-
mals were again tested. Five did not react to the test and the re-
maining two gave positive reactions. The animals were all slaughtered
in October, 1808, and lesions of tuberculosis were found in all cases
except one, even though the animals had not reacted for three years
previous to the time of slaughter. It is thus certain that the disease
may remain dormant in the animal for at least three years and may
then assume a progressive form.
Table III.
Date.
July. 1W04..............................................
Januarv. 1905 ...................
July.      19     0 .... ..........................................
January. 1906............................................
January. 190.        ..........................................
July. P196........................
lanuary. 1907........................................
JIuly, 1907...............................................
January. 115........................................
August 1908............................................


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