The objective of this study was to evaluate the effectiveness of reusing a
controlled internal drug release (CIDR) device for up to three times in the reproductive
performance of dairy goats raised in the semi-arid zone of northeastern Brazil. Forty-five goats
were allocated into three hormone treatments, as follows: CIDR1x, treated with new CIDR
during nine days. Two days prior to device removal, injections of 75 g d-cloprostenol and 300
IU equine chorionic gonadotropin (eCG) were administrated. For the other treatments, the
same hormone protocol was used, differing only by the use of the same CIDR for a second time
in CIDR2x and for a third time in CIDR3x. The interval from device removal to the onset of
estrus (13.3 1.1h vs. 13.8 2.6h vs. 13.3 1.4h), as well as estrus duration (33.6 7.3h vs. 29.6
3.2h vs. 32.8 4.5h), did not differ (p > 0.05) among groups CIDR1x, CIDR2x and CIDR3x,
respectively. All synchronized females were found to be in estrus. The overall fertility and
prolificacy after artificial insemination were 82.2% and 1.9 kids, respectively, without significant
difference (p > 0.05) among treatments. The use of the same CIDR for up to three times was
effective using 9-day estrus synchronization protocols in dairy goats.