The animal breeding act of 1966 : 20 years of pig improvement in France L. OLLIVIER, J.P. RUNAVOT, J. DAGORN, R. GUEBLEZ, J. JEHANNO, R. KERISIT, C. LEGAULT, M. MOLENAT and P. SELLIER Ann. Zootech., 35 3 (1986) 302 DOI: 10.1051/animres:19860327