Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds D. Fernandez-Abella, D. Becu-Villalobos, I. M. Lacau-Mengido, N. Villegas and O. BentancurReprod. Nutr. Dev., 39 5-6 (1999) 617-624DOI: https://doi.org/10.1051/rnd:19990508