| Abstract: | The present study supports that short‐term (7‐days) protocols based on progestagen‐impregnated sponges and progesterone‐loaded CIDRs are equally effective to induce ovulatory response in sheep. There were no significant differences in the onset of estrus behavior (32.0 ± 6.0 and 33.8 ± 4.0 hr after device withdrawal for sponges and CIDRs, respectively; p > 0.05) and preovulatory LH discharge (5.1 ± 2.1 and 5.8 ± 3.3 hr after onset of estrus behavior for sponges and CIDRs, respectively; p > 0.05). These features are similar to previously described for classical long‐term (12–14 days) treatments. Hence, short‐term CIDR‐based protocols may be implemented using the same time‐intervals for insemination than sponge‐based and long‐term protocols. |
