RELATION INVERSE ENTRE LA CONCENTRATION DES SERUMS FŒTAUX BOVINS EN HORMONE CHORIONIQUE SOMATOMAMMOTROPE ETLEUR AGE JF Beckers, P. Wouters-Ballman, FJ Ectors, K. Touati, A. Delval, M. Bormans and F. Ectors Reprod. Nutr. Dev., 29 Suppl. 1 (1989) 29 DOI: 10.1051/rnd:19890748