Common Diseases of Farm Animals | Page 2

cannula in "bloat". 14. Photograph
of model of digestive tract of horse. 15. Photograph of model of
digestive tract of ruminant. 16. A yearling colt that died of aneurism
colic. 17. Photograph of model of udder of cow. 18. Photograph of
model of uterus of cow containing foetus. 19. Placenta of cow. 20. A
case of milk-fever. 21. Milk-fever apparatus. 22. A case of catarrhal
cold. 23. Photograph of model of horse's heart. 24. Elephantiasis in
horse. 25. Photograph of model of horse's brain. 26. Unilateral facial
paralysis. 27. Bilateral facial paralysis. 28. Skeleton of horse. 29.
Photograph of model of stifle joint. 30. Atrophy of the muscles of the
thigh. 31. Shoulder lameness. 32. Shoe-boil. 33. Sprung knees. 34.
Splints. 35. Bones of digit. 36. Photograph of a model of the foot. 37.
Foot showing neglect in trimming wall. 38. A very large side bone. 39.
A case of navicular disease. 40. An improperly shod foot. 41.
Toe-cracks. 42. Quarter-crack caused by barb-wire cut. 43. Changes
occurring in chronic laminitis. 44. Atrophy of the muscles of the
quarter. 45. String-halt. 46. A large bone spavin. 47. Normal cannon
bone and cannon bone showing bony enlargement. 48. Bog spavins. 49.
Thorough pin. 50. Curbs. 51. Head of young horse showing position
and size of teeth. 52. Longitudinal section of incisor tooth. 53.
Cross-section of head of young horse, showing replacement of molar
tooth. 54. Transverse section of incisor tooth 55. Transverse sections of
incisor tooth showing changes at different ages. 56. Teeth showing
uneven wear occurring in old horses. 57. Fistula of jaw. 58. A large
hock caused by a punctured wound of the joint. 59. A large
inflammatory growth following injury. 60. Fistula of the withers. 61.
Shoulder abscess caused by loose-fitting harness. 62. A piece of the
wall of the horse's stomach showing bot-fly larvae attached. 63. Biting
louse. 64. Sucking louse. 65. Nits attached to hair. 66. Sheep-tick. 67.
Sheep scab mite. 68. Sheep scab. 69. A severe case of mange. 70. Liver
flukes. 71. Tapeworm larvae in liver. 72. Tapeworms. 73. Tapeworm
larvae in the peritoneum. 74. Thorn-headed worms. 75. Large
round-worm in intestine of hog. 76. Lamb affected with stomach worm
disease. 77. Whip-worms attached to wall of intestine. 78. Pin-worms

in intestine. 79. A hog yard where disease-producing germs may be
carried over from year to year. 80. Carcass of a cholera hog. 81.
Kidneys from hog that died of acute hog-cholera. 82. Lungs from hog
that died of acute hog-cholera. 83. A piece of intestine showing
intestinal ulcers. 84. Cleaning up a hog lot. 85. Hyperimmune hogs
used for the production of anti-hog-cholera serum. 86. Preparing the
hog for vaccination. 87. Vaccinating a hog. 88. Koch's Bacillus
tuberculosis. 89. A tubercular cow. 90. Tubercular spleens. 91. The
carcass of a tubercular cow. 92. A section of the chest wall of a
tubercular cow. 93. A very large tubercular gland. 94. A tubercular
gland that is split open. 95. Caul showing tuberculosis. 96. Foot of hog
showing tuberculosis of joint. 97. Staphylococcus pyogenes. 98.
Streptococcus pyogenes. 99. Bacillus of malignant oedema, showing
spores. 100. Bacillus of malignant oedema. 101. Bacillus bovisepticus.
102. A yearling steer affected with septicaemia haemorrhagica. 103.
Bacillus anthracis. 104. Bacillus necrophorus. 105. Negri bodies in
nerve-tissue. 106. A cow affected with foot-and-mouth disease. 107.
Slaughtering a herd of cattle affected with foot-and-mouth disease. 108.
Disinfecting boots and coats before leaving a farm where cattle have
been inspected for foot-and-mouth disease. 109. Cleaning up and
disinfecting premises. 110. Bacillus tetani. 111. Head of horse affected
with tetanus. 112. A subacute case of tetanus. 113. Streptococcus of
strangles. 114. Bacillus mallei. 115. Nasal septum showing nodules and
ulcers. 116. Streptococcus pyogenes equi. 117. A case of "lumpy jaw".
118. The ray fungus. 119. Bacillus of emphysematous anthrax. 120.
Cattle tick (male). 121. Cattle tick (female). 122. Blood-cells with
Piroplasma bigeminum in them. 123. Bacillus avisepticus.

PART I.--INTRODUCTORY

CHAPTER I
GENERAL DISCUSSION OF DISEASE

Disease is the general term for any deviation from the normal or
healthy condition of the body. The morbid processes that result in
either slight or marked modifications of the normal condition are
recognized by the injurious changes in the structure or function of the
organ, or group of body organs involved. The increase in the secretion
of urine noticeable in horses in the late fall and winter is caused by the
cool weather and the decrease in the perspiration. If, however, the
increase in the quantity of urine secreted occurs independently of any
normal cause and is accompanied by an unthrifty and weakened
condition of the animal, it would then characterize disease. Tissues may
undergo changes in order to adapt themselves to different environments,
or as a means of protecting themselves against injuries. The coat of a
horse