72 Internal Influences on the Character of Milk. 



of the febrile affection and on account of the inappetence due to 

 the pain caused by the vesicles in the mouth and on the feet. The 

 effect of the disease upon milk secretion varies according to the 

 individuals, the age and the lactation. Siedamgrotzky, Weber 

 and Born have published the effects of the disease on milk secre- 

 tion during outbreaks in certain herds. In 43 cows the quantity 

 of milk at the height of the disease dropped from 745 to 364 liters, 

 and again rose after the eradication of the outbreak to 522 liters. 

 Thirty cows of another herd gave only 30 liters instead of 300 

 liters of milk during a period of eight days. In a third herd the 

 quantity of milk dropped from 510 to 260 liters, later rising to only 

 350 liters. Other figures showed a decrease from 750 to 280 liters, 

 with a subsequent rise to 400. The diminished yield per cow per 

 day was from 5 to 6 liters and even more. In cows that have been 

 milking for a long time the loss in milk reaches as high as 75 %, 

 in animals in the middle of the lactation period up to 43%, while 

 in fresh milkers it may amount to 55% (Hutyra and Marek). 

 Sugar and fat contents diminish, but at times the amount of fat 

 may become considerably higher. The volatile fatty acids are 

 diminished, but the milk contains more albumin and salts, an in- 

 creased amount of thrown-off epithelium, colostral cells, pus cells, 

 and also red blood corpuscles (Lavena, Kalantar, Herberger, 

 Kreis, Vogler and others). The catalase content is increased even 

 if the udder manifests no changes (Bertin-Sans and Gaujoux). 



Honigmund examined five cows affected with foot-and-mouth 

 disease, one of which was not visibly affected on the day of the 

 examination although already infected. The individual data in- 

 side of nine davs were as follows : 



It appears also from the other investigations of Honigmund, 

 in which the animals showed symptoms of the disease as early as 

 on the first day of the examination, that the fat and ash content 

 is greater in the first day than in normal conditions. The total 

 solids and also the fat-free solids fluctuate considerably. 



When catarrh of the milk ducts becomes associated with foot- 

 and-mouth disease, the milk becomes yellowish, of a rancid, bitter 

 taste, colostrum-like, and similar to the secretion during other in- 



