This resulted in 6,350 to 9,550 market-weight ducks per house on litter flooring and 10,000 to 10,300 per house on plastic slatted slats. The commercial Pekin strain that was used throughout the study was one that has been developed and is used by Maple Leaf Farms Inc. Ducklings were placed at 1 d of age, and after an initial 10-d brooding period in approximately one-third of the house, they were given access to the entire barn. Processing of all ducks took place at the Maple Leaf Farms processing facility when they reached commercial target weights (~3.5 kg) between 32 and 36 d. The Hope College Animal Care and Use Committee approved an exemption because the project was conducted in commercial facilities.