| Sumario: | ABSTRACT This study aimed to evaluate the effect of reinserting controlled internal drug release (CIDR) devices after fixed-time artificial insemination (FTAI) on pregnancy rates in goats. Oestrus was synchronized with a short (5 days) CIDR protocol, and FTAI was conducted 54 hours after CIDR removal. According to the reinsertion of CIDR after FTAI, goats were assigned to three treatments: G0 control group (n=29), no CIDR reinsertion; G7 group (n=27), CIDR reinserted 7 days; G14 group (n=29), CIDR reinserted 14 days. Blood samples were collected to determine progesterone levels. Oestrus appearance (92.9%), interval of CIDR removal to oestrus (IRE=34.1±1.1 hours), interval of oestrus onset to artificial insemination (IEAI= 20.2±1.0 hours), mean duration of oestrus (38.4±1.4 hours), and pregnancy rates (61.0%) were similar (P>.05) among groups. Progesterone concentrations were higher (P<.05) in G7 and G14 than G0 goats. G7 goats had lower (P<.05) oestrus rate, after CIDR reinsertion, than G0 and G14 goats. Overall pregnancy rate was similar (P>.05) for all groups. In conclusion, reinsertion of CIDR for 7 or 14 days after a short oestrus synchronization protocol and FTAI did not increase the overall pregnancy rate of goats.
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