DAIRYING 55 



.3 minute or 18 seconds. If the dirt and slime accumulates and 

 reduces the space from 3 pounds to 2.8 pounds, the time the milk 

 will remain in the bowl is reduced from 18 to 16 seconds and this 

 w.ill have the same effect on the efficiency of skimming as in- 

 creasing the amount of milk skimmed per hour. 



The Separator Slime. 



324. A deposit of dirt, hair, and a greyish white, slimy sub- 

 stance is left on the walls of a separator bowl after it has been 

 used for skimming milk. The amount of this deposit varies with 

 the sw v eetness and the cleanness of the milk and the temperature 

 jf the milk at the time it is skimmed. It increases with the 

 acidity and with the temperature of the milk. If perfectly sweet 

 milk is skimmed at a pasteurizing temperature, say 160 deg. F., 

 this slime will accumulate in the bowl very rapidly and may soon 

 fill the bowl so that it is 'necessary to stop the skimming and re- 

 move this slime. 



325. Besides the dirt in the milk and many of the bacteria, 

 the bowl slime contains a nitrogenous constituent of the milk 

 which is probably in suspension and heavier than the milk serum. 

 The amount of slime taken from milk varies from .01% to .3%. 

 Many analyses of it have been made and its composition is shown 

 by the following figures :* 



Water 66. to 75. % 



Fat 1 to 4.1 % 



Nitrogenous matter 17.5 to 29.4 % 



Other organic matter 85 to 7.75% 



Mineral matter 1.5 to 4.1 % 



This leathery coating of slime taken from the inside of the 

 separator bowl when cleaning it should be burned and not washed 

 lown the drain or fed to any animal, because of the large number 

 bacteria it contains, and while these may be harmless at times, 

 lere is danger of spreading diseases by feeding it to any animal. 



*Kirchner Milchwirtschaft. 



