EEGULATION OF PRODUCTION 173 



must be made that the delivery of milk must cease in- 

 stantly if numerous cases of septic enteritis or strepto- 

 coccus mastitis appear and also if ' ' calf cholera ' ' occurs 

 malignantly or endemically. 



Moreover, the prompt removal from the herd is de- 

 sired of every animal that has fever, or any kind of 

 infectious disease. It is the duty of the owner himself 

 to discontinue the delivery of the milk and to undertake 

 the necessary isolation, when occasion may arise be- 

 tween the visits of the veterinarian, and he should call 

 the veterinarian as soon as any suspicious disease may 

 appear. 



These requirements are already enforced by private 

 companies and so there can be no question as to whether 

 it is possible to carry them into effect but, up to the pres- 

 ent time, they are enforced by the public in only a few 

 cities. 



b. Feeding the herd. As has already been stated, 

 it is now the belief that the composition of the milk does 

 not depend in any material degree on the composition 

 of the food, and that injurious substances are not ex- 

 creted through the udder to the extent that was formerly 

 supposed. Therefore, one is not justified in forbidding 

 the use of such a number of foods as has been done and 

 is still done by some large cities. Only such foods 

 should be prohibited as are decomposed (mouldy, putrid 

 or fermenting), or materials containing great numbers 

 of resistant bacteria of fermentation (creamery refuse, 

 frozen forage, the offal of root crops, etc.), or excessive 

 quantities of unnatural food materials (the refuse of 

 some manufactories, distillers' slops, malt, molasses 

 etc.), and strongly smelling vegetable matter (turnip 

 tops, cabbage, green forage containing poisonous plants, 

 etc.). The use of other food stuffs should be forbidden 

 in such quantities as are injurious to the cow (turnips 



