Role of the uterus in early regression of corpora lutea induced by the ram effect in seasonally anoestrous Barbarine ewes N. Lassoued, G. Khaldi, P. Chemineau, Y. Cognié and J. Thimonier Reprod. Nutr. Dev., 37 5 (1997) 559-571 DOI: 10.1051/rnd:19970507