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- Title
Fertility in Cebú × brown Swiss cows treated with prostaglandins, progesterone and eCGS.
- Authors
Ventura-Ríos, Joel; Lara-Bueno, Alejandro; Carrillo-López, Pedro; Álvarez-Vázquez, Perpetuo; Cigarroa-Vázquez, Francisco A.; Encina-Domínguez, Juan A.
- Abstract
Objective: To evaluate the application of one or two doses of prostaglandin F2α (PGF2α), the application of a progestogen on different days of the estrous cycle and the usage of eCG in the estrus synchronization and fertility of Zebu × Brown Swiss cows. Design/methodology/approach: The study was based on three protocols. The first consisted of two treatments: PGI) 26 cows were injected with a single 25 mg dose of PGF2α and 10 cows with two 25 mg doses of PGF2α at a 14-day interval. Protocol 2 consisted of two treatments: NG14) 11 cows were implanted with 3 mg of Norgestomet on day 7 of their estrous cycle and NG7) 11 animals received the same dose on day 14. In protocol 3 all cows were implanted with 3 mg of Norgestomet for 9 days, 48 h before removing the implant, 25 mg of PGF2α was applied. Once the implants were removed, they were distributed into two treatments. Norgestomet (n=11) without eCG and Norgestomet + eCG (500 IU) (n=11). Results: The application of PGF2α at two times had no influence (p≤0.05) in the estrous percentages and conception. The NG7 achieved estrous synchronization in 81.8 % of the cows, in between 24 and 36 h, compared to 45.4 % of the NG14; however, the conception rate was lower (p≤0.05). The eCG application synchronized 90.9 % of estrous between 24 and 36 h, compared with 36.4 % of the group with no eCG application. Study limitations/implications: Transrectal ultrasounds are required to assess the ovarian structures present at the time of the estrus onset in a synchronization protocol. Findings/conclusions: Cows that present corpus luteum do not require more than one injection of PGF2α, the pregnancy percentage increases when Norgestomet is implanted on day 14 of the estrous cycle, in addition the application of eCG increases the synchronization percentage of the heat between 24 to 36 h after the progestogen withdrawal.
- Subjects
ESTRUS; COWS; FERTILITY; CORPUS luteum; PROSTAGLANDINS; PROGESTERONE
- Publication
Agro Productividad, 2021, Vol 14, Issue 2, p9
- ISSN
2448-7546
- Publication type
Article
- DOI
10.32854/agrop.v14i2.1971