Comparative study of some characteristics of the semen of RR (rose comb) or rr (single comb) cockerels M. PETITJEAN, Madeleine SERVOUSE, G. MALINEAU and M. MARCHAND Reprod. Nutr. Dévelop., 21 6B (1981) 1085-1093 DOI: 10.1051/rnd:19810807