Extending the duration of treatment with progesterone and equine chorionic gonadotropin improves fertility in suckled beef cows with low body condition score subjected to timed artificial insemination

Bilbao, María Guillermina; Massara, N.; Ramos, Sebastian; Zapata, LO; Farcey, M.F.; Pesoa, J.M.; Turic, Esteban; Vázquez, M.I.; Bartolome, J.A.

doi:10.1016/j.theriogenology.2016.02.003

Cited by 6 publications

(2 citation statements)

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“…Long-term progesterone treatment did not increase the pregnancy rate in cows with high BCS; however, the combination of long-term progesterone and eCG treatment increased the pregnancy rate per preovulatory follicle and arti cial insemination in cows with low BCS (Bilbao et al, 2015). The effect of eCG applications on fertility in lactating Holstein cows was limited to cows with low BCS.…”

Section: Resultsmentioning

confidence: 86%

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The Effect of A PRID®Delta-Based Estrus Synchronization Protocol On Pregnancy Rates In Cows With No Estrus Symptoms

Demir

Kaçar

Ari

et al. 2022

Preprint

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The present study aimed to determine the effects of progesterone-based gonadotropin-releasing hormone (GnRH), prostaglandin F2α (PGF2α), and equine chorionic gonadotropin (eCG) injections on progesterone profiles and pregnancy rates in cows with no estrus symptoms within 60 days after parturition. A total of 80 cows were included in the study. All animals had the progesterone-releasing device PRID®Delta placed intravaginally for nine days with an injection of GnRH. On the eighth day, PGF2α was injected, and PRID®Delta was removed from the vagina on day nine. Artificial insemination was carried out 60 hours after PRID®Delta removal. In half of the animals (n = 40), 600 IU of eCG was injected when PRID®Delta was removed on the ninth day before artificial insemination 60 hours later. Blood samples were taken from the tail vein on days 0 and 8 to determine progesterone levels. The pregnancy rate in the group that received eCG was 37.5%, while it was 27.5% in those that did not (P = 0.4). While the dominant follicle diameter was 15.5 mm in cows injected with eCG during timed artificial insemination, the follicle diameter was 12.4 mm in cows with no eCG injection (P <0.001). There were no differences in serum progesterone values in blood samples taken until the time of artificial insemination. However, progesterone values in the blood taken during artificial insemination were 0.94 ng/ml in the eCG- group and 0.72 ng/ml in the eCG+ group (P <0.05). As a result, it was determined that eCG injections, in addition to progesterone-based GnRH and PGF2α applications, increased the pregnancy rates in cows without symptoms of estrus. The dominant follicle diameter was larger in cows treated with eCG during artificial insemination; however, follicle size did not increase the pregnancy rate.

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Section: Resultsmentioning

confidence: 86%

“…Núñez-Olivera et al, 2014;Bilbao et al, 2015). It was thought that treatment with eCG would increase gonadotropin support in follicle development and thus increase the size of the dominant follicle and the possibility of ovulation, thereby increasing fertility in grazing purebred or crossbred beef and dairy cattle(Prata et al, 2017).…”

mentioning

confidence: 99%