The spontaneous recovery percentage of early cysts is 60-65% (Kesler and Garverick, 1982; Refsdal, 1982; Day, 1991b). Arbeiter et al. (1990) and Purohit et al. (2001) found a spontaneous recovery percentage of OC in 27.17 and 24% of cows, respectively. Steinbauer (1985) recommended treatment only after day 50 post partum, because of possible spontaneous regression of the cyst. Youngquist (1986) stated that spontaneous recovery might reach 60% if the condition is present before 30 days post partum. It would be profitable to treat multiparous cows having cysts very early in the postpartum period, while treatment of primiparous cows should be delayed, at least until the end of the preservice period, to provide the opportunity for spontaneous recovery (López-Gaitus et al., 2002). Dinsmore et al. (1989) did not find major differences between clinical response to treatments given before or after 35 days post partum.