Another source of dirt and disease germs in milk is the barn. The walls of a barn where cows are milked should always be kept clean and should be whitewashed frequently. If this is done, there will be comparatively little dirt on the walls to fall into the milk.
Fig. 14. Only clean milk will come from a dairy where proper precautions are taken.
Of course the walls and floors of a barn cannot be kept absolutely clean. There will always be some dirt, and the movements of the cows shifting their position and switching their tails, will stir up the dust; so it is important to remove the milk from the barn as soon as possible. Milk cans should never be kept in the barn. The milk should be taken directly from the barn to a cooling house and there strained.
All barns where cows are kept should have plenty of windows, that there may be an abundance of light and fresh air. Cows need fresh air just as much as people do, while a barn that is not supplied with plenty of light is very likely to be a dirty barn.
Keep dirt and disease germs out of the milk by keeping the barn clean and by taking the milk away from the barn as soon as possible.
Fig. 15. A dirty, insanitary milk-house.