The Vet. Book 



hocks that are narrow below, or " tied in," favour 

 the development of bone spavin. Heredity shows 

 itself quite apart from disease and constitutes the 

 basis of selection, or the production of pedigree 

 stock. The direct transference of disease from 

 parent to progeny (Congenital disease) most 

 certainly does exist and Tuberculosis has been 

 found in animals immediately they are born, but 

 such is quite exceptional. 



Such disease as Tuberculosis has always been 

 looked upon as of a strictly hereditary nature, but 

 since, the recognition of the specific organisms and 

 their almost constant presence in vitiated surround- 

 ings has, to a large extent, modified these views. 

 The presence of disease in a foetus "in utero," is 

 the best proof of its hereditary nature. 



Acquired disease is that which arises subsequent 

 to birth, as opposed to that of a hereditary nature. 



Specific or Germ Diseases 



This term is applied to a class of diseases arising 

 from special causes and mostly due to parasites, 

 either of vegetable or animal origin. Some 

 diseases, such as Red-water in cattle, arise through 

 a class of minute organisms known as protozoa, 

 and the organisms which produce this disease are 

 introduced into the blood of cattle through the 

 cattle Tick. They are of exceedingly minute size 

 and exist within the white blood cells, as elongated 

 bodies with whip-like extremities, but in order to 



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