Control of the sexual cycles of nulliparous gilts. Comparison of two progestagens : Norethandrolone and RU 2267 Françoise MARTINAT-BOTTE, P. MAULÉON and J. GAUTIERAnn. Zootech., 26 3 (1977) 444-445DOI: https://doi.org/10.1051/animres:19770315