Principles of Veterinary Science; a Text-Book for Use in Agricultural Schools
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Natural immunity is inherited by the animal from its parents and transmitted to its offspring. It may be an attribute of the species, the breed, or the individual. Hog cholera, a typical infectious disease, will serve to illustrate these three forms of DISEASE IN GENERAL 199 natural immunity. While hog cholera is usually fatal to swine, horses possess a natural immunity common to the species against this disease. An instance where a species possesses a general immunity, but where individuals ar...e occasionally attacked, is seen in tuberculosis of the dog and cat. These animals are usually immune to tuberculosis, but now and then one is found affected with it. Breed immunity against hog cholera is claimed by some unscrupulous breeders to be possessed by mule-foot hogs. Experiments conducted to prove this claim have resulted in the contraction of the disease by animals of this breed, so the claim is completely disproved. That breed immunity does exist is shown by the fact that Algerian sheep are naturally immune to anthrax, yet all other breeds of sheep are highly susceptible to it.
What to read after Principles of Veterinary Science; a Text-Book for Use in Agricultural Schools?
You can find similar books in the "Read Also" column, or choose other free books by Hadley, Frederick Brown, 1880- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Natural immunity is inherited by the animal from its parents and transmitted to its offspring. It may be an attribute of the species, the breed, or the individual. Hog cholera, a typical infectious disease, will serve to illustrate these three forms of DISEASE IN GENERAL 199 natural immunity. While hog cholera is usually fatal to swine, horses possess a natural immunity common to the species against this disease. An instance where a species possesses a general immunity, but where individuals ar...e occasionally attacked, is seen in tuberculosis of the dog and cat. These animals are usually immune to tuberculosis, but now and then one is found affected with it. Breed immunity against hog cholera is claimed by some unscrupulous breeders to be possessed by mule-foot hogs. Experiments conducted to prove this claim have resulted in the contraction of the disease by animals of this breed, so the claim is completely disproved. That breed immunity does exist is shown by the fact that Algerian sheep are naturally immune to anthrax, yet all other breeds of sheep are highly susceptible to it.
What to read after Principles of Veterinary Science; a Text-Book for Use in Agricultural Schools?
You can find similar books in the "Read Also" column, or choose other free books by Hadley, Frederick Brown, 1880- to read onlineMoreLess
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