DAIRY AND GENERAL 



To estimate the amount of air required for a herd of 27 

 head of cattle and for five horses we would multiply 27, the 

 number of cattle by 59, the number of cubic feet of air re- 

 quired for a cow, which is 1,593. To provide fresh air for 

 the horses multiply 71, which is the number of cubic feet ot 

 air required for one horse, by 5, the number of horses to be 

 kept. This equals 355 cubic feet. The total requirement 

 then would be 1,593 cubic feet for the cattle and 355 for the 

 horses, or a total of 1,948 cubic feet. 



In order to get the total cross-sectional area of either 

 outlets or inlets divide 1,948 by 300 (the rate at which air 

 travels a minute in the flues of a stable) and you would have 

 6.49. Multiplying 6.49 by 144 (the number of square inches 

 in a square foot) would give 934.5, the total cross-sectional 

 area in square inches of inlets or outlets for this barn. Now 

 the total required area 934.5 will be divided by the number 

 of flues to be provided. A sufficient number of inlet flues 

 should be provided so that the fresh air will enter the barn 

 every 10 to 12 feet. This barn being 36x86 feet, the inlet 

 flues spaced at 12 feet intervals would require 18 flues. 



To get the area of each in- 

 let divide the total cross-sec- 

 tional area of inlets by 18 

 (1,948 -7- 18 = 52) each flue 

 should have an opening of 52 

 square inches. A 6x8-inch 

 inlet flue comes nearest to 

 providing this amount. 



The total cross-sectional 

 area of the outlets divided by 

 4 (1,948 + 4 = 234), which 

 is the number of outlets that 

 will remove the foul air from 

 all parts of the barn, gives a 

 total area of 234 square inch- 

 es for each outlet. This area 

 will be secured in a flue 16x16 

 inches. The area of the out- 

 let flues should be a little 

 greater than that of the in- 

 lets. 



Take Care of the Manure. Fig . 7 o ._ 



The galvanized iron shields prevent 



T Hinged Window Ventilators. 

 he galvanized iron shields prev 



Udii y udi the air from ente ring at the sides and 



purpose barn, mUSt be blowing directly upon the stock. 

 Fourteen 



