I90 ILLINOIS DAIRYMEN'S ASSOCIATION. 



abundance of oxygen, and unless this is supplied a great waste of food as 

 well as impaired health of the cow will result. 



Much has been said about the number of cubic feet of air space that 

 should be allowed for a cow, but this is of little consequence in compari- 

 son with the more important question of ventilation, or change of air. In 

 order not to get a greater degree of impurity in the air than is permissi- 

 ble with good results each cow should be supplied with 3,540 cubic feet of 

 air per hour. The size of the ventilating flues to be provided will depend 

 upon the number of cows in the stable. About four square feet is a good 

 size for a ventilating flue and if so constructed as to cause the air to travel 

 300 feet, a minutes this will furnish ventilation for twenty cows. Two 

 flues this size would be sufficient for forty cows and five would be required 

 for one hundred cows. 



To be sanitary a dairy barn should be whitewashed at least once a 

 year. An interior with a few boards laid overhead at irregular intervals, 

 with hay hanging through and with the sides in no better condition, 

 cannot be properly whitewashed. The ceiling should be tight, excluding 

 all dust and chaft from above, and sides smooth, thus affording a firm 

 surface to which the whitewash can cling. 



To be sanitary a barn should be whitewashed at least once a year. 

 It is not necesary to ceil the barn with surfaced lumber, in fact, the white- 

 wash will adhere better if the surface is not too smooth. The boards 

 must, however, be reasonably clean before the whitewash is applied, 

 otherwise it will be of little use, for it will soon shell off with the filth; 

 and besides this, filth simply covered is not removed. 



Whitewash is one of the cheapest disinfectants and can be easily and 

 rapidly applied with a spray pump. It must be carefully strained before 

 using in the pump as any lumps will clog the spray nozzle. 



A cement floor is the most sanitary for a cow stable and when put 

 <flown it should be left rough under the float to prevent the cows from 

 slipping. An objection often made to cement floors is that they are cold 

 in winter, but as the temperature in a dairy barn should never get below 

 40 degrees F. this objection is largely overcome, if the cows are properly 

 bedded. When a plank floor is used it must be renewed as fast as it 

 wears or rots out. 



