The particular brooder house described is 14 feet wide and has a shed roof. It is provided with a window in the front of each pen. No openings are required along the back since this is not a double pen house. The space in such a house could undoubtedly be used to better advantage if it were constructed as wide as the No. 1 house and the hot water pipes and walk put through the middle of the house so as to provide double pens. In this house the hot water pipes are run along the rear of the pens, and while hovers are not really necessary, a walk is constructed over the pipes in order to save space and provide a convenient place from which to do the work, and this forms hovers. Ordinarily after May 1 no heat is needed in the No. 2 house. The pens in this house are 12 feet wide and they are equipped with feeding and watering arrangements as in brooder house No. 1. As the ducklings are moved to this house from the No. 1 house from 150 to 200 are placed in each pen. They are moved through the house from pen to pen in the same manner as in the No. 1 house to make way for new arrivals. As a rule they stay in this house about two weeks depending somewhat on the weather and upon the number of ducklings being brooded. Yards are used in connection with this house which are the same width as the pens and 50 feet in length. As in the No. 1 house the pens in this house should be cleaned at least once a week and they should be bedded with straw or other bedding material every other day. As soon as the ducks have been moved through this No. 2 house they are put in brooder house No. 3. [Illustration: FIG. 26. Brooder house No. 2 and yards. The trees furnish fine shade for the growing ducklings. (_Photograph from the Bureau of Animal Industry, U. S. Department of Agriculture._)] Brooder House No. 3 This is a shed roof house 16 feet wide equipped with single pens. No heat is required in this house. Yards of the same width as the pens and 50 feet deep are used. Usually the ducks are fed outside the house from a wagon driven along a roadway just in front of the yards. The pens are 16 feet wide and the same number of ducks is used in them as in the No. 2 house. As a rule the ducks stay in this house about 2 weeks and are then moved to the duck pens or shelters with the larger yards which may or may not have water. From this point on the ducks are termed yard ducks. In all three of the brooder houses the young ducks are supplied with their drinking water from pipes through the houses. They are not given access to water until they are moved to the yards. [Illustration: FIG. 27. Brooder house No. 3. At the time this picture was taken there were no ducklings in the house and advantage was taken of this fact to give it a good cleaning by throwing out the bedding and droppings, which will be hauled away and spread on cropped land. (_Photograph from the Bureau of Animal Industry, U. S. Department of Agriculture._)]