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The Lubbock System places weaned sows in crates with a boar placed in a pen directly behind them. Usually one boar is housed behind five or six sows. The boar pen is used not only to house the boar but for breeding. Females are backed into the breeding pen when estrus is detected. Generally all five sows are not from the same weaning group. This prevents the boar from being over-used.
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 Lubbock System" (1997). Agriculture and Environment Extension Publications. 168.