Ovulation rate in ewes synchronized with Syncro-Mate-B (SMB) and follicle stimulating hormone

Stenbak, T.K.; Grazul-Bilska, Anna T.; Berginski, H.R.; Bilski, Jerzy J.; Erickson, Aron; Kirsch, James D; Kraft, Kim C.; Navanukraw, Chainarong; Toutges, Michelle; Reynolds, Lawrence P.; Redmer, Dale A.

doi:10.1016/s0921-4488(03)00011-7

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…Thus, follicle diameter seems to vary greatly depending on the breed evaluated (Souza et al 2011). The administration of hCG using the long-term protocol advanced the onset estrus and the time of ovulation (Stenbak et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the reuse of intravaginal devices as a cost saver is a possibility to be explored in other indigenous farm animals (Vilarino et al 2010;Reyes et al 2012). Additionally, gonadotropins such as pregnant mare's serum gonadotropin (PMSG), follicle-stimulating hormone (FSH), and human chorionic gonadotropin (hCG), have been also used as a means of inducing ovulation and superovulation in sheep and goats (Stenbak et al 2003;Lertchunhakiat et al 2012). In ruminants, hCG has a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

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Estrous and ovulatory responses following cervical artificial insemination in Thai-native goats given a new or once-used controlled internal drug release with human chorionic gonadotropin

Navanukraw

Khanthusaeng

Kraisoon

et al. 2014

Trop Anim Health Prod

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The study was conducted to compare estrous rate, ovulatory response, plasma progesterone concentrations, and conception rate following cervical artificial insemination in goats given a new or once-used controlled internal drug release (CIDR) device with human chorionic gonadotropin (hCG). Fifty-six Thai-native goats with the average age and body weight of 11 months and 17.3 kg received a 14-day treatment with a new CIDR device (Eazi-Breed(TM)CIDR®, Pfizer, NY, USA) or a once-used CIDR device. All goats received a 300-IU injection of hCG (Chorulon®, Intervet International B.V., New Zealand) at the day of CIDR removal to induce ovulation. All goats displaying signs of Estrous behavior were artificially inseminated at 12 h after the onset of estrus with frozen semen. No differences in percentage of estrus and ovulation rates were observed; however, goats that received once-used CIDR devices exhibited shorter (P < 0.05) duration of estrus in comparison with new devices (21.4 ± 1.4 h vs. 26.1 ± 1.1 h) and delayed the onset of estrus (47.0 ± 3.6 h vs. 36.5 ± 1.9 h) and the time of ovulation (74.9 ± 3.9 h vs. 64.5 ± 1.3 h), respectively. Progesterone (P4) concentrations were not significantly different (P > 0.05) between treatments during CIDR device insertion and at the time of CIDR removal except on day 4. No significant differences were found in overall conception rates between the treatments. This study indicates that the once-used CIDR device with hCG could be applied to synchronize the estrus and ovulation in small-size Thai-native goats without negative effects on Estrous behavior, ovulatory response, and plasma P4 concentration.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estrous and ovulatory responses following cervical artificial insemination in Thai-native goats given a new or once-used controlled internal drug release with human chorionic gonadotropin

Navanukraw

Khanthusaeng

Kraisoon

et al. 2014

Trop Anim Health Prod

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“…The main reason for the absence of differences between hormonal treatments in terms of follicular features during the end of follicular activity (the second laparoscopic observation) may have been due to the later effect of FSH on ovarian activity compared to eCG (Driancourt and Fry 1992). Previous studies reported that eCG has the capacity to induce both FSH and LH hormone activity, which are synthesized and secreted by the gonadotropic cells of the anterior pituitary gland (Stenbak et al 2003, Murphy 2012. Moreover, eCG causes early activation of oocyte into follicle (Moor et al 1985) and follicles exposed to eCG synthesize larger amounts of P 4 (Driancourt and Fry 1992).…”

Section: Discussionmentioning

confidence: 99%

Polish Journal of Veterinary Sciences

Şen

2020

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Conventional methods for determining the reproductive performance of sheep bred either after estrus synchronization during the breeding season or after induction of estrus/ovulation during the non-breeding season take a long time and may give misleading results due to the effect of environmental factors. Laparoscopic observations allow real-time monitoring of ovarian activity around estrus or ovulation. This study was aimed at assessing the superovulatory effects of follicle-stimulating hormone (FSH) and equine chorionic gonadotropin (eCG) treatments by laparoscopy during breeding (September-November, n=12) and non-breeding (April-June, n=12) seasons in Akkaraman sheep. In both seasons, after CIDR withdrawal, the ewes were injected either with 600 IU eCG or 300 µl (20 mg/ml) FSH twice at 12 hour intervals. Plasma P 4 , E 2 and LH concentrations were determined at the time of intra-vaginal CIDR insertion (day 0) and then at its withdrawal (day 12), followed by 3 and 6 days of eCG or FSH injections. After 3 (first observation) and 6 (second observation) days of hormone injections, laparoscopy was performed to record ovarian activity in both seasons. The eCG increased (p<0.05) the numbers of large follicles (first observation) and CL (first and second observations) in the breeding season compared to FSH treatment. CL, small-moderate and large follicle numbers of eCG treated ewes were higher (p<0.05) than those of FSH at both observations in the non-breeding season. In the breeding season, eCG treated ewes had higher (p<0.05) plasma P 4 (3 and 6 days after hormones injections) and E 2 (3 days after hormones injections) concentrations than those of FSH. In conclusion, the results of the present study indicate that treatment with eCG during the non-breeding season can support ovarian activity, and thus increase ovulation rate and plasma hormone concentrations around induced estrus/ovulation in Akkaraman ewes.

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“…Stenbak et al 13 observed that hormonally induced ewes usually exhibit estrus at 24-48 h after the removal of progestagen implants or pessaries. Greyling and Brink14 determined that estrus occurred about 31 h after the end of P4 treatment, Van Cleff et al 15 reported estrus 36 h after the P4 treatment, and Godfrey et al 16 reported estrus 34-40 h following P4 treatment.…”

mentioning

confidence: 99%

Koyunlarda Anöstrus Mevsiminde Kullanılmış CIDR-G Uygulamasıyla Östrusun Uyarılması

Güngör¹,

Özyurtlu²,

Pancarcı³

et al. 2009

Kafkas Univ Vet Fak Derg

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Ovulation rate in ewes synchronized with Syncro-Mate-B (SMB) and follicle stimulating hormone

Cited by 4 publications

References 31 publications

Estrous and ovulatory responses following cervical artificial insemination in Thai-native goats given a new or once-used controlled internal drug release with human chorionic gonadotropin

Estrous and ovulatory responses following cervical artificial insemination in Thai-native goats given a new or once-used controlled internal drug release with human chorionic gonadotropin

Polish Journal of Veterinary Sciences

Koyunlarda Anöstrus Mevsiminde Kullanılmış CIDR-G Uygulamasıyla Östrusun Uyarılması

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