*Induction and Synchronization of Estrus DOI: http://dx.doi.org/10.5772/intechopen.90769*

than short (10 days) cycles in earlier anestrous cows. Moreover, the withdrawal of a progestin has been demonstrated to induce onset of cycles in some anestrous females; the likelihood of an ovulation is enhanced. A second advantage to inclusion of the CIDR in this program is that the early heats (day 6 to day 9) that are inherent to these systems are prevented. The progesterone released by the CIDR will prevent estrus and ovulation between days 1 and 9.
