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The breeding square is arranged with four breeding pens that are surrounded by turn-around crates. The two sides of the square facing each other are the same sex animal. The corners hold the gilts in pens. The center is divided into four breeding pens, each 11 ft by 11 ft. This system is designed for twenty boars, twenty sows, and sixteen gilts.
Livestock Industry Facilities and Environment
Iowa State University Extension and Outreach
Agricultural and Biosystems Engineering
Agricultural Education | Bioresource and Agricultural Engineering
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Harmon, Jay D. and Watson, Carl, "Livestock Industry Facilities and Environment: Swine Breeding Systems—the Breeding Square System" (1997). Agriculture and Environment Extension Publications. 166.