Influence of season on mean plasma levels of prolactin, placental lactogen hormone and luteinizing hormone during the second half of gestation in the ewe M. J. BOSC, J. DJIANE, P. DURAND, J. PELLETIER and J. P. RAVAULTReprod. Nutr. Dévelop., 22 3 (1982) 485-493DOI: https://doi.org/10.1051/rnd:19820405