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Comparison of Farrowing Crate and Conventional Farrowing Pen with Guard Rails for Brood Sows

Charles Elmer BarnhartG. D. Pendergrass

出版	Kentucky Agricultural Experiment Station, University of Kentucky, 1952
URL	http://books.google.com.hk/books?id=OEYnAQAAMAAJ&hl=&source=gbs_api