482 



BOVINE PATHOLOGY. 



agalactia takes place in two or three years after spaying 

 has been performed, but others assert that this is only a 





Fig. 115. — A. Lobule of mamma filled with 

 milk. B. Milk globules. C. Colostrum. 

 a. Cell with visible nucleus, b. Cells from 

 which the nucleus has disappeared. (From 

 Colin, 'Physiologie des animaux domes- 

 tiques.*) 



Fig. 114. — Section of the 

 cow's teat, a a. Principal 

 lactiferous ducts, b. Lac- 

 tiferous sinus, c c. Acini. 

 d d. Dartoid tissue of the 

 teat. e. Orifice of the 

 teat. (From Colin, "Physi- 

 ologic des animaux do- 

 mestiques.*') 



very exceptional condition, the secretion of milk being 

 constant and lasting for a long time. Aged cows dry up, and 

 a loss of milk is the first symptom in many important 

 diseases. 



Hypergaladia, or prolonged lactation, is not so frequent 

 and is often seen in very good milkers. It is hardly a 

 diseased state, but it constitutes a great strain on the 

 system. 



Changes in the quality op the Milk are — (1) due to 

 excess or deficiency of natural components. Thus, some 

 milk gives scarcely any cream, while in other cases the 

 secretion is scanty, but very rich. Bluish watery milk is 

 given sometimes in normal quantity by debilitated animals. 

 These and other similar conditions are dependent on feed- 

 ing, and other points of management. The nature of the 

 food very frequently affects the flavour of the butter. 

 Sometimes it is found that the milk gives little 

 butter, and at other times is not valuable for cheese. 

 (2) Admixture of foreign matters, as blood, pus, specific 

 discharges, bacteria, &c. These result from specific or 



