While this may look like a glorified swing for the birds to ride on, it's actually a scale that continually monitors what the birds weigh. The turkeys use it as a perch, though, and constantly hop on and off of it. The scale calculates an average weight of the birds - and that information is sent to a computer in the control room.
This information helps Brent to ensure that the birds are receiving enough food and are growing at an appropriate rate. Brent walks through this barn twice each day to ensure that all of his birds are healthy, and that the barn's feeders and waterers are all working properly.