State University Press, 1995, p. 76. Also see "The Welfare of Sows in Gestation Crates: A Summary of the Scientific Evidence", Farm Sanctuary, accessed
murine tissues and lethality of LSR-/- embryos at 12.5 to 14.5 days of gestation." Eur J Biochem. 2004 Aug;271(15):3103-14. PMID 15265030, doi:10.1111/j
; McCandless, Camilla T.; James, Kelsey; Hoey, John (8 August 2017). “Gestation period and pupping seasonality of female spiny dogfish (Squalus acanthia)