Effects of oestrus induction with progestagens or prostaglandin analogues on ovarian and pituitary function in sheep

Letelier, Claudia; Contreras-Solis, I.; García‐Fernández, Rosa A.; Sánchez, María Angeles Moro; García-Palencia, Pilar; Sánchez, Benigno; Ariznavarreta, C.; Tresguerres, J. A. F.; Flores, Juana M.; González-Bulnes, Antonio

doi:10.1016/j.anireprosci.2011.04.012

Cited by 19 publications

(10 citation statements)

References 37 publications

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“…The time of onset of estrus in the present work is akin to the observations of Naqvi et al (1997). Contrary to present study, Letelier et al (2011) and Ashmawy et al (2012) observed lesser values and Zohara et al (2014) observed longer values. The delay in the onset of estrus in ewes synchronized with the small doses of cloprostenol was might have taken more time to induce complete luteolysis than a larger dose leading to delay in preovulatory LH surge and preovulatory growth (Contreras-Solis et al 2009).…”

Section: Resultscontrasting

confidence: 95%

“…The present findings supports the hypothesis that the most of ewes were sensitive to 2 nd dose of prostaglandin (Menchaca et al 2004) leading to complete luteolysis with the higher dose of PGF2 in Group II and variations observed among different studies might be due to difference in the breed (Karagiannidis et al 2001), breeding season (Zonturlu et al 2011), latitude and management (Zonturlu et al 2008). The higher estrus response in Group II ewes might be due to differences in ovarian status among the ewes at the time of treatment (Ashmawy, 2012) and better luteolysis (Hafez, 2008) during growing phase of largest follicle leading to the synchrony of estrus and the lesser in Group I ewes might be due to poor luteolysis leading to inadequate follicular development (Letelier et al 2011).…”

Section: Resultsmentioning

confidence: 99%

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Synchronization of Nellore Jodipi ewes by different doses of PGF2a

Kumar

Bramhaiah

Naidu

et al. 2017

IJAR

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Nellore Jodipi cyclic ewes were synchronized to assess the effectiveness of two different doses of double PGF2á (Cloprostenol sodium) @ either 125 or 250 µg with 9 d interval in Groups I and II based on the estrus response and fertility rate after intra cervical inseminations at 60 and 72 h after 2nd PGF2a. The estrus response (%), onset of estrus (%), duration of estrus (h) and intensity of estrus in ewes synchronized by PGF2a were 80.95 and 85.71; 50.94+3.12 and 48.00+3.40; 24.35+1.41 and 28.22+1.15 and 6.76+0.29 and 6.83+0.34 in Groups I and II, respectively. The conception rate based on 25 d non return rate was 85.71 and 80.95 % with an overall lambing rate of 71.43 and 66.67 % in Group I and II, respectively. The study revealed that the synchronization response among the treated ewes by 125 µg of PGF2á was slightly lesser with higher lambing rate than 250 µg of PGF2a.

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Section: Resultscontrasting

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Synchronization of Nellore Jodipi ewes by different doses of PGF2a

Kumar

Bramhaiah

Naidu

et al. 2017

IJAR

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“…Research on the increase in reproduction efficiency is optimizing and improving techniques. Letelier et al, 2011 researched on the induction of estrus with progestogens or prostaglandine, melatonine and norgestomet (USLU et al, 2012), prostaglandines (FIERRO et al, 2013), progesterone (VILARIÑO et al, 2013), bisphenol A or diethylstilbestrol (RIVERA et al, 2011) and lectin (GRAZUL-BILSKA et al, 2013).…”

Section: Introducionmentioning

confidence: 99%

Characterization and Celular Proliferation of Ovarian Structures of Ewes by the Technique of Agnor: Ovarian Morfometry and Correlations

Chacur

Arrebola

Ibrahim

et al. 2015

Revista Brasileira De Engenharia De Biossistemas

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The AgNOR staining technique for nucleolar organizer regions (NORs) is characterized by marking proteins related to ribossomal ribonucleic acid evaluating celular proliferation. The objective was to study the ovarian morphometry and the value of AgNOR thecnique application to evaluate the proliferation of healthy cels from ovarian structures in crossbred ewe. 102 pairs of ovaries were collected and from the largest follicle of each ovary was measured its diameter. From the largest corpus luteum (CL) was measured the diameter and width, classifying the CL in: included, protruberant, massive and cavity, followed by AgNOR staining. The significance level was 5%. It had difference (p<0.05) for the diameter of the largest follicle between right (RO): 4.2±2,3mm and left (LO): 3.6±2,2mm sides. There was a correlation (p<0.01) between the NORs of internal theca (IT) and external theca (ET): RO (0.46) and LO (0.61); NORs of granulosa and IT: RO (0.54) and LO (0.59); and NORs of granulosa and ET: RO (0.34) and LO (0.38). Was conclude that the NORs quantification was appropriate to study the determination of the potential for ovarian structures proliferation, which was similar for right and left sides.

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“…Progestogens have generally produced more favorable estrous response in comparison with prostaglandinbased protocols (Gonzalez-Bulnes et al, 2002;Godfrey et al, 1997;Langford et al, 1983;Simonetti et al, 2000). However, use of progestogens in estrous synchronization can be associated with a degree of sub-fertility compared with the unaltered cycle due to alterations in the pattern of LH release (Scaramuzzi et al, 1988;Haresign, 1985;Letelier et al, 2011) and decreases in sperm transport and survival in the reproductive tract (Hawk and Conley, 1971). One factor that could help elucidate the disparity in fertility often noted between the two approaches could be the increased uterine vascularity observed in progestogen-treated compared with prostaglandin-treated ewes.…”

Section: ) Long-term Progesterone-based Synchronization Protocolsmentioning

confidence: 99%

“…Synchronization of estrus with prostaglandin results in preovulatory follicles with altered steroidogenic capacity which produce subfunctional corpora lutea (White et al, 1987;Wiley et al, 1997;Letelier et al, 2011). Additionally, steroids are essential for preparation of the reproductive tract for fertilization and embryo transport and also serve to induce appropriate myometrial contractions for improvement of fertility (Fierro et al, 2011;Meikle et al, 2001;Sosa et al, 2008).…”

Section: Prostaglandin-based Approachesmentioning

confidence: 99%

Effect of Time of PGF2alpha Application on Reproductive Outcome in Ewes

Paul¹

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Traditionally, prostaglandin F 2α (PGF 2α) has been included in short-term progesterone-based estrous synchronization (STPBES) protocols but its inclusion has been associated with a reduction in fertility at the synchronized estrus. Also, previous studies have shown that there are differences in the endocrine status and follicular dynamics of ewes at different stages of the estrous cycle, although effects have not been sufficiently evaluated regarding the reproductive outcomes when luteolysis is induced on different days of the cycle. To evaluate the effect of time of application of PGF 2α relative to the progesterone treatment on fertility, ewes (N=442) from 4 farms located in WV and PA were randomly assigned to receive controlled internal drug-releasing devices (CIDRg; 0.3 g progesterone) for 5 days alone (n=123; treatment 1), in combination with 25 mg PGF 2α (5 mL Lutalyse; Dinoprost Tromethamine; Zoetis) at CIDR insertion (n=103; treatment 2) or removal (n=100; treatment 3), or 25 mg PGF 2α alone (n=116; treatment 4)

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Effects of oestrus induction with progestagens or prostaglandin analogues on ovarian and pituitary function in sheep

Cited by 19 publications

References 37 publications

Synchronization of Nellore Jodipi ewes by different doses of PGF2a

Synchronization of Nellore Jodipi ewes by different doses of PGF2a

Characterization and Celular Proliferation of Ovarian Structures of Ewes by the Technique of Agnor: Ovarian Morfometry and Correlations

Effect of Time of PGF2alpha Application on Reproductive Outcome in Ewes

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