FERTILITY OF FRIESIAN CATTLE INSEMINATED AT PREDEFINED TIMES AFTER LUTEOLYSIS WITH PROSTAGLANDIN ANALOGUE ICI 80996 G. S. POPE, J. D. LEAVER, R. G. GLENCROSS, P. M. MULVANY and N. BAISHYA Ann. Biol. anim. Bioch. Biophys., 16 2 (1976) 169 DOI: 10.1051/rnd:19760234