“…It is not understood how an increase in prolactin at this time or during early pregnancy in EI-fed ewes could lead to decreased pregnancy rates. A dual role of LH and prolactin has been suggested for CL maintenance both during the cycle and in early pregnancy (Tabarelli et al, 1982;Kann and Denamur, 1974). However, changes in luteinizing hormone were not observed in EI-fed heifers (Mizinga et al, 1992) or ewes administered an ergopeptide (Louw et al, 1974).…”