[1] Vet Res Inst, Dept Genet & Reprod Biotechnol, Brno, Czech Republic
[2] Acad Sci Czech Republ, Inst Anim Physiol & Genet, Libechov, Czech Republic
[3] Czech Acad Sci, Inst Biotechnol, Lab Reprod Biol, BIOCEV, Vestec, Czech Republic
[4] Charles Univ Prague, Fac Sci, Dept Zool, Prague, Czech Republic
[5] Univ Missouri, Div Anim Sci, Columbia, MO USA
[6] Univ Calif San Francisco, Dept Obstet Gynecol & Reprod Sci, San Francisco, CA USA
[7] Michigan State Univ, Dept Anim Sci Reprod & Dev Sci Program, Dev Epigenet Lab, E Lansing, MI 48824 USA