Superovulation in cattle: practical aspects of gonadotropin treatment and insemination Wilhelm Kanitz, Frank Becker, Falk Schneider, Ellen Kanitz, Claus Leiding, Hans-Peter Nohner and Ralf Pöhland Reprod. Nutr. Dev., 42 6 (2002) 587-599 DOI: 10.1051/rnd:2002045