82 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



Another campaign which we have been conducting for the 

 past year is that against the common housefly. We have done 

 this for the reason that we have found it is absolutely necessary 

 to control flies around dairy establishments, as well as other 

 buildings used for the handling of food stuffs, if the product is 

 to be kept in a clean and sanitary condition. To intelligently 

 fight the fly we must know something of its life habit. 



On the screen I show you the life cycle of the fly. Notice 

 in the top of the circle a large mass of eggs which the female 

 deposits. These eggs are deposited in masses of from one hun- 

 dred to one hundred and twenty each, and after one day these 

 hatch into maggots. The maggot then grows and feeds for five 

 days longer, gaining sufticient energy to produce an adult fly. 

 At the end of this five-day period it then undergoes a certain 

 period of five days, known as the pupa, or resting stage, after 

 which the full grown fly emerges. Thus, in a period of fourteen 

 days, during average temperature conditions, a complete life 

 cycle of the fly is formed, and after a few days longer the house- 

 fly starts about its mission of carrying filth and disease germs 

 to our food products. The principal breeding place of the 

 housefly on the farm is in stable manure. 



On the screen I show a picture of a barn used for housing 

 dairy cattle, behind which is a pile of manure, almost sufficiently 

 great to reach the mow level. This slide has been truly labeled 

 *'An Unholy Trinity: Flies, Filth and Fever." 



The difficulty of keeping milk products under such condi- 

 tions is evident to all those who have studied the question of 

 dairy sanitation. 



The food value of milk has also been given serious study 

 by our department, and during the State Fair and the recent 

 National Dairy Show, we have made an exhibit of the compara- 

 tive composition of milk. 



In this exhibit, which I now show you on the screen, are 

 grouped together the more common food stuffs. In each parcel 

 is contained that amount of food stuff equivalent to a quart of 

 milk in total food value. The low cost of milk, as compared 

 with other foods in quantities sufficient to yield the same energy, 



