The reinsertion of controlled internal drug release devices in goats does not increase the pregnancy rate after short oestrus synchronization protocol at the beginning of the breeding season

• Published in: Journal of Applied Animal Research Vol. 46; no. 1; pp. 714 - 719
• Main Authors: Montes-Quiroz, Gabriela Lisset, Sánchez-Dávila, Fernando, Grizelj, Juraj, Bernal-Barragán, Hugo, Vazquez-Armijo, José Fernando, Bosque-González, Alejandro Sergio del, Luna-Palomera, Carlos, González Gómez, Adán, Ledezma-Torres, Rogelio Alejandro
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 01.01.2018; Taylor & Francis Group
• Subjects: artificial insemination; CIDR; Goats; oestrus synchronization; progesterone
• ISSN: 0971-2119; 0974-1844
• DOI: 10.1080/09712119.2017.1386109

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.