Efficiency of two protocols of resynchronization of estrus and ovulation in high-producing dairy cows at peak lactation
Autori
Đorđević, MilanBlagojević, Jovan
Radinović, Miodrag
Cincović, Marko
Maletić, Jelena
Kreszinger, Mario
Maletić, Milan
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
The reproductive efficiency of the cows was monitored after two resynchronization protocols: Ovsynch (OVS) and Double Ovsynch (DOS). The research initially included 70 HF cows who entered the first synchronization protocol - Presynch. Cows that did not conceive after the first synchronization were divided into two groups and introduced to two resynchronization protocols. In the first group of cows (n=35), the DOS protocol began with the application of GnRH on day 22 after the Presynch TAI (Timed Artificial Insemination), and seven days later pregnancy check-up was done and PGF2α was applied only to non-pregnant cows (n=23), which remained in the study. In the second group of cows, the OVS protocol started on day 32 after Presynch TAI only in non-pregnant animals (n=20). Progesterone (P4) concentration was determined at the time of application of GnRH1, PGF2α and GnRH2 in both groups of cows, and then 30 days after Resynch TAI, ultrasound pregnancy diagnosis was done. A higher percentag...e of pregnant cows were recorded in the OVS group compared to the DOS group (45% and 35%, respectively). The concentration of P4 in the serum of cows in the DOS group during the first measurement (GnRH1) was significantly higher than the value in cows that did not conceive (p<0.05), while in the third measurement (GnRH2) the average concentration of P4 in conceiving cows was significantly lower (p<0.001) compared to cows that did not coincive. The open days period was significantly longer in pregnant cows that were resynchronized using the DOS protocol compared to cows from the OVS protocol. In conclusion, the OVS protocol of estrus resynchronization in dairy cows proved to be more successful than the DOS protocol. However, considering the advantages the OVS, it is needed to determine which day of the sexual cycle is the best to start resynchronization.
Ključne reči:
Holstein-Friesian cow / GnRH / Prostaglandin F2α / Ovsynch / Double-Ovsynch / ProgesteroneIzvor:
Acta Veterinaria, 2022, 72, 362-Izdavač:
- Sciendo
Finansiranje / projekti:
- Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije, institucionalno finansiranje - 200143 (Univerzitet u Beogradu, Fakultet veterinarske medicine) (RS-MESTD-inst-2020-200143)
Kolekcije
Institucija/grupa
Fakultet veterinarske medicineTY - JOUR AU - Đorđević, Milan AU - Blagojević, Jovan AU - Radinović, Miodrag AU - Cincović, Marko AU - Maletić, Jelena AU - Kreszinger, Mario AU - Maletić, Milan PY - 2022 UR - https://vet-erinar.vet.bg.ac.rs/handle/123456789/2832 AB - The reproductive efficiency of the cows was monitored after two resynchronization protocols: Ovsynch (OVS) and Double Ovsynch (DOS). The research initially included 70 HF cows who entered the first synchronization protocol - Presynch. Cows that did not conceive after the first synchronization were divided into two groups and introduced to two resynchronization protocols. In the first group of cows (n=35), the DOS protocol began with the application of GnRH on day 22 after the Presynch TAI (Timed Artificial Insemination), and seven days later pregnancy check-up was done and PGF2α was applied only to non-pregnant cows (n=23), which remained in the study. In the second group of cows, the OVS protocol started on day 32 after Presynch TAI only in non-pregnant animals (n=20). Progesterone (P4) concentration was determined at the time of application of GnRH1, PGF2α and GnRH2 in both groups of cows, and then 30 days after Resynch TAI, ultrasound pregnancy diagnosis was done. A higher percentage of pregnant cows were recorded in the OVS group compared to the DOS group (45% and 35%, respectively). The concentration of P4 in the serum of cows in the DOS group during the first measurement (GnRH1) was significantly higher than the value in cows that did not conceive (p<0.05), while in the third measurement (GnRH2) the average concentration of P4 in conceiving cows was significantly lower (p<0.001) compared to cows that did not coincive. The open days period was significantly longer in pregnant cows that were resynchronized using the DOS protocol compared to cows from the OVS protocol. In conclusion, the OVS protocol of estrus resynchronization in dairy cows proved to be more successful than the DOS protocol. However, considering the advantages the OVS, it is needed to determine which day of the sexual cycle is the best to start resynchronization. PB - Sciendo T2 - Acta Veterinaria T1 - Efficiency of two protocols of resynchronization of estrus and ovulation in high-producing dairy cows at peak lactation VL - 72 VL - 3 SP - 362 SP - 374 DO - 10.2478/acve-2022-0029 ER -
@article{ author = "Đorđević, Milan and Blagojević, Jovan and Radinović, Miodrag and Cincović, Marko and Maletić, Jelena and Kreszinger, Mario and Maletić, Milan", year = "2022", abstract = "The reproductive efficiency of the cows was monitored after two resynchronization protocols: Ovsynch (OVS) and Double Ovsynch (DOS). The research initially included 70 HF cows who entered the first synchronization protocol - Presynch. Cows that did not conceive after the first synchronization were divided into two groups and introduced to two resynchronization protocols. In the first group of cows (n=35), the DOS protocol began with the application of GnRH on day 22 after the Presynch TAI (Timed Artificial Insemination), and seven days later pregnancy check-up was done and PGF2α was applied only to non-pregnant cows (n=23), which remained in the study. In the second group of cows, the OVS protocol started on day 32 after Presynch TAI only in non-pregnant animals (n=20). Progesterone (P4) concentration was determined at the time of application of GnRH1, PGF2α and GnRH2 in both groups of cows, and then 30 days after Resynch TAI, ultrasound pregnancy diagnosis was done. A higher percentage of pregnant cows were recorded in the OVS group compared to the DOS group (45% and 35%, respectively). The concentration of P4 in the serum of cows in the DOS group during the first measurement (GnRH1) was significantly higher than the value in cows that did not conceive (p<0.05), while in the third measurement (GnRH2) the average concentration of P4 in conceiving cows was significantly lower (p<0.001) compared to cows that did not coincive. The open days period was significantly longer in pregnant cows that were resynchronized using the DOS protocol compared to cows from the OVS protocol. In conclusion, the OVS protocol of estrus resynchronization in dairy cows proved to be more successful than the DOS protocol. However, considering the advantages the OVS, it is needed to determine which day of the sexual cycle is the best to start resynchronization.", publisher = "Sciendo", journal = "Acta Veterinaria", title = "Efficiency of two protocols of resynchronization of estrus and ovulation in high-producing dairy cows at peak lactation", volume = "72, 3", pages = "362-374", doi = "10.2478/acve-2022-0029" }
Đorđević, M., Blagojević, J., Radinović, M., Cincović, M., Maletić, J., Kreszinger, M.,& Maletić, M.. (2022). Efficiency of two protocols of resynchronization of estrus and ovulation in high-producing dairy cows at peak lactation. in Acta Veterinaria Sciendo., 72, 362. https://doi.org/10.2478/acve-2022-0029
Đorđević M, Blagojević J, Radinović M, Cincović M, Maletić J, Kreszinger M, Maletić M. Efficiency of two protocols of resynchronization of estrus and ovulation in high-producing dairy cows at peak lactation. in Acta Veterinaria. 2022;72:362. doi:10.2478/acve-2022-0029 .
Đorđević, Milan, Blagojević, Jovan, Radinović, Miodrag, Cincović, Marko, Maletić, Jelena, Kreszinger, Mario, Maletić, Milan, "Efficiency of two protocols of resynchronization of estrus and ovulation in high-producing dairy cows at peak lactation" in Acta Veterinaria, 72 (2022):362, https://doi.org/10.2478/acve-2022-0029 . .