Efficacy of estradiol or GnRH in combination with progesterone intravaginal devices to control the follicular wave dynamics and resulting fertility in lactating dairy cows

Scandolo, DG; Domínguez, Germán; Bilbao, María Guillermina; Perez, Wallace S; Zapata, LO; Ravera, E; Meléndez, P.; Archbald, L.F.; la, Sota Rl de; Bartolome, J.A.

doi:10.1016/j.anireprosci.2020.106646

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…Estrogen yang tinggi mengakibatkan muncul gejala birahi pada hari ke 6-7 setelah dilakukan terapi. Gejala birahi pada sapi penderita hipofungsi setelah dilakukan terapi antara lain adalah hewan merasa tidak tenang dan berisik, vulva bengkak, kemerahan dan panas, keluar lendir serviks yang terlihat jernih dan lengket, serta diam ketika dinaiki (Scandolo et al, 2020).…”

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Profile of Progesterone Levels After Administration of Gonadotropins in Dairy Cattle with Ovarian Hypofunction

et al. 2023

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This study aimed to evaluate the profile of progesterone in dairy cattle with ovarian hypofunction. A total of 10 cows in this study were evaluated three times in the collection phase, i.e. (F1) when the cow was diagnosed with ovarian hypofunction, (F2) when the cow was in heat and (F3) 21 days after artificial insemination to detect pregnancy. Samples in the form of blood serum were then analyzed using ELISA. As a result, the average time of heat in ovarian hypofunction cows was 7,4 days. Progesterone levels in F1 were 1,027 ng/ml, 2,774 ng/ml, 1,476 ng/ml, 2,256 ng/ml, 1,258 ng/ml, 1,758 ng/ml, 2,393 ng/ml, 0,592 ng/ml, 0,755 ng /ml, 1,876 ng/ml, respectively. Progesterone levels in F2 were 0,671 ng/ml, 0,517 ng/ml, 0,763 ng/ml, 0,598 ng/ml, 0,615 ng/ml, 0,537 ng/ml, 0,726 ng/ml, 0,643 ng/ml, 0,593 ng/ml, 0,975ng/ml, respectively. Progesterone levels in F3 were 15,642 ng/ml, 4,215 ng/ml, 17,327 ng/ml, 20,721 ng/ml, 5,796 ng/ml, 17,214 ng/ml, 15,815 ng/ml, 16,745 ng/ml, 4,632 ng /ml, 18,281 ng/ml, respectively. The pregnancy rate in hypofunctional cows treated with PG-600 in this study was 70%.

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Profile of Progesterone Levels After Administration of Gonadotropins in Dairy Cattle with Ovarian Hypofunction

et al. 2023

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“…5 One factor that limits responses to GnRH-based protocols is the percentage of animals that ovulate following administration of GnRH at the time of inserting an IVD. Ovulation rates in most studies have varied between 50 and 65% in dairy cows 4,[6][7][8][9][10] and 33%-66% in beef cows [11][12][13][14] and heifers. 15 Increasing the ovulatory response to the first treatment of GnRH as part of the Ovsynch protocol has been associated with improved synchronisation and pregnancy rates to AI in lactating dairy cows.…”

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Comparison of the initial ovarian response, the synchrony of oestrus and ovulation and chronic stress response after administration of 100 or 250 μg of GnRH to randomly cycling Bos indicus cattle

Abdallah

Joone

Edwards³

et al. 2022

Aust Veterinary J

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Objective This study investigated the effects of administering saline, 100 or 250 μg of gonadotrophin releasing hormone (GnRH) on ovarian response, synchrony of oestrus and ovulation and chronic stress response in Bos indicus cattle. Design Randomised control.Methods Animals were either left untreated (n = 20) or on day 0 treated with an intravaginal progesterone releasing device and either saline (n = 24), 100 μg (n = 35), or 250 (n = 35) μg of GnRH, intramuscular (IM). Blood was sampled 1.4 h after administration of treatment to monitor concentrations of luteinising hormone (LH) and P4 in serum and again 5 days later. On day 5 intravaginal P4 releasing device were removed, cloprostenol was administered IM and again 8 h later. Oestrus and ovulation were then monitored with ultrasonography for 6.5 days. Hair was clipped on day 55 for analysis of hair cortisol concentrations (HCC).Results No significant differences were found between Saline and GnRH treatments in the odds of inducing a new corpus luteum (CL) and the synchrony of oestrus or ovulation. HCC did not differ significantly between treatments. Mean concentrations of LH in serum on day 0 were less in the Saline compared to 100 and 250 μg GnRH treatments but did not differ between different doses of GnRH. ConclusionMean concentrations of LH and the odds of inducing a new CL were not increased after administering 250 μg compared to 100 μg of GnRH. Animal handling events in the study did not influence HCC. Further research is needed to better optimise responses to GnRH in B. indicus cattle.

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Comparison of the 7-day CO-Synch and 8-day estradiol-based protocols for estrus synchronization and timed artificial insemination in suckled Bos taurus cows

et al. 2023

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Efficacy of estradiol or GnRH in combination with progesterone intravaginal devices to control the follicular wave dynamics and resulting fertility in lactating dairy cows

Cited by 6 publications

References 35 publications

Profile of Progesterone Levels After Administration of Gonadotropins in Dairy Cattle with Ovarian Hypofunction

Profile of Progesterone Levels After Administration of Gonadotropins in Dairy Cattle with Ovarian Hypofunction

Comparison of the initial ovarian response, the synchrony of oestrus and ovulation and chronic stress response after administration of 100 or 250 μg of GnRH to randomly cycling Bos indicus cattle

Comparison of the 7-day CO-Synch and 8-day estradiol-based protocols for estrus synchronization and timed artificial insemination in suckled Bos taurus cows

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