Reproduction in Domestic Animals

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Theriogenology 39, 1303–1311.Author’s address (for correspondence): Kazuhiro Kikuchi, Division ofAnimal Sciences, National Institute of Agrobiological Sciences,Kannondai 2-1-2, Tsukuba, Ibaraki 305-8602, Japan. E-mail:kiku@affrc.go.jpConflict of interest: All authors declare no conflict of interests.Ó 2008 The Authors. Journal compilation Ó 2008 Blackwell Verlag