Diseases, ailments, and abnormal conditions of swine. Page: 2
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FARMERS' BULLETIN 1244
directly or indirectly, to improper care in housing, feeding, and at
farrowing time. Even under the best conditions hogs are liable to
sicken, and in all circumstances of that character there is need of correct
diagnosis in order that effective treatment may be given. Many
factors are to be considered in distinguishing between hog cholera
and the various other ailments and conditions that resemble that
Hog cholera is still the most serious of swine diseases. For many
years the swine industry has been hampered and retarded in growth
by the ravages of the disease, and in some sections entire herds were
destroyed. The reappearance of cholera year after year, with practically
no known methods of protection, lent a discouraging aspect
to the raising of swine. The losses in a single year from cholera
have been computed as high as $73,000,000, and for many years they
were estimated at $40,000,000 annually.
FIGURE 1.-Pigs in advanced stage of hog cholera
Though years have been spent in the study of hog cholera there
are yet many factors responsible for the spread of the infection that
are not known or fully understood. As a result of experiments a
serum was developed by the United States Department of Agriculture
which protects hogs against cholera. The general adoption
and use of this immunizing agent have created a feeling of security
among swine growers, and the result has been an increase in the
production of hogs. Incidentally, it has stimulated the raising of
cattle, since this phase of farming can be engaged in on a more
profitable basis by having healthy herds of hogs follow the cattle.
Although losses from hog cholera have been reduced over 60 per
cent from the peak years of destruction, the lack of attention on
the part of farmers to the proper care of swine still occasions a
serious monetary loss each year to the swine industry as a whole.
Symptoms.-Hog cholera is characterized by complete loss of appetite,
extremely high temperature, constipation usually followed by
diarrhea, chills, depression, burrowing in litter, ears and tail drooping,
and sometimes a cough. (See fig. 1.) Red spots or blotches appear
on the skin of the belly, inner side of the hams, and on the ears.
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White, T. P. (Timothy Paul), 1872-. Diseases, ailments, and abnormal conditions of swine., book, 1938; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc6492/m1/4/?q=%22livestock%22: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.