Evidence that the photoperiod controls the annual changes in testosterone secretion, testicular and body weight in subtropical male goats José Alberto Delgadillo, María Elena Cortez, Gerardo Duarte, Philippe Chemineau and Benoît MalpauxReprod. Nutr. Dev., 44 3 (2004) 183-193DOI: https://doi.org/10.1051/rnd:2004024