The time of eCG administration in progesterone injection-based estrus synchronization protocol could affect the time of estrus expression in ewes during non-breeding season

Payan, Maryam; Niasari-Naslaji, A.; Samani, Hassan Seidi; Darbandsari, Mojtaba; Alijani, Amir; Baninajjar, Mohammad; Ganjkhanlou, M.

doi:10.1016/j.smallrumres.2022.106814

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Despite the early eCG treatments not improving AI outcomes, the −12 h treatment in the breeding season significantly increased the percentage of ewes in oestrus 24 h after pessary removal (Figure 3a). Comparable results have been reported in earlier studies (Ali, 2007; Payan et al, 2022). This improvement supports the hypothesis (Walker, Kelly, Hebart, et al, 2023) that young ovulatory follicles in the breeding season are less well developed compared with the non‐breeding season and more likely to respond positively to earlier eCG treatment.…”

Section: Discussionsupporting

confidence: 90%

“…Treatment, which usually occurs at pessary removal, stimulates follicle development and increases ovulation rate (Ainsworth & Shretha, 1985; Boland et al, 1981; Leyva et al, 1998). Limited studies (Ali, 2007; Payan et al, 2022) indicate that when eCG is administered early, oestrus occurs earlier reflecting a likely improvement in follicle quality.…”

Section: Introductionmentioning

confidence: 99%

“…Limited studies (Ali, 2007;Payan et al, 2022) indicate that when eCG is administered early, oestrus occurs earlier reflecting a likely improvement in follicle quality.…”

mentioning

confidence: 99%

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Strategies to improve the success of fixed‐time artificial insemination in the ewe

Weaver

Kelly

Swinbourne

et al. 2023

Reprod Domestic Animals

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During the sheep breeding season, ovulatory follicles vary widely in age at pessary removal impacting both the timing of oestrus and pregnancy rates following artificial insemination (AI). Ovulatory follicles that emerge between days 7 to 9 of the pessary period are associated with higher fertility whilst those that emerge earlier or later are associated with lower fertility. In this study, two strategies to improve the success of AI by controlling the development of the ovulatory follicle were examined. In the first, ewes were treated with PGF2α at either −12 and/or +6 days (experiment 1) or −27 days (experiment 2) relative to pessary insertion to control the time of emergence of the ovulatory follicle. In the second, ewes were treated with eCG (400 IU per ewe) at either 0 h, −6 h or −12 h relative to pessary removal (experiment 3) to improve the development of young ovulatory follicles. PGF2α administered on day −27 increased the percentage of pregnant ewes by 17.8% and the number of foetuses per 100 ewes inseminated by 33.9%. PGF2α treatment at other times had either no effect or reduced fertility. During the breeding season, treatment with eCG at −12 h improved the synchrony of oestrus, reduced the size of the ovulatory follicle but did not improve pregnancy rate compared with other treatments. Treatment had no effect during the non‐breeding season, supporting earlier findings that the quality of young ovulatory follicles differs during the year. In conclusion, PGF2α treatment 27 days before pessary insertion provides a new and cheap strategy to improve the success of fixed‐time AI programs.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Strategies to improve the success of fixed‐time artificial insemination in the ewe

Weaver

Kelly

Swinbourne

et al. 2023

Reprod Domestic Animals

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“…Progestogens are usually administered using intravaginal devices, including silicone-based devices impregnated with progesterone (P4), such as Controlled Internal Drug Release (CIDR) and Dispositivo Intravaginal Caprino Ovino (DICO) ( Wheaton et al, 1993 ; Vilariño et al, 2010 ), or, intravaginal sponges (IVS) impregnated with progesterone analogues, as medroxyprogesterone acetate (MAP) or flurogestone acetate (FGA) ( Barrett et al, 2008 ; Santos et al, 2010 ). There are some preliminary studies on the administration of long-acting injectable progesterone ( Rodríguez-Martínez et al, 2018 ; Alvarado-Espino et al, 2019 ; Amaral D’Avila et al, 2022 ; Payan et al, 2022 ), but the results are still inconsistent. Until now, sponges impregnated with MAP have been used for the resynchronization protocol ( Miranda et al, 2018 ; Cosentino et al, 2019 , 2021 , 2022 ), but to the best of our knowledge, there are no studies with other progestogens.…”

Section: General Aspectsmentioning

confidence: 99%

Recent advances in treatments for resynchronization of ovulation in small ruminants: a review

et al. 2023

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Hormonal methodologies to control small ruminants’ estrous cycle are worldwide used and evolved, adjusting the application to the precise female physiological moments to enhance reproductive performance. The estrous cycle can be induced and/or synchronized, aiming for fixed-time artificial insemination, or based on estrus behavior signs for insemination, natural or guided mating. Successive protocols can be performed to resynchronize ovulation and increase reproductive outcomes in females that failed to conceive. These recently developed treatments aim to resynchronize the ovulation as earlier as non-pregnancy is detected. The present review aimed to summarize the recent advances and main findings regarding resynchronization protocols used in small ruminants. Lastly, we present future perspectives and new paths to be studied in the subject. The resynchronization treatment is still a growing field in small ruminant reproduction, nevertheless, some enhancements are found in the reproductive outcome, showing that such protocols can be successfully used in sheep and goat production.

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Effectiveness of human recombinant FSH for enhancing reproductive performance of ewes in progesterone injection-based estrus synchronization program

Alijani,

Niasari-Naslaji,

Baninajjar

et al. 2024

Small Ruminant Research

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The time of eCG administration in progesterone injection-based estrus synchronization protocol could affect the time of estrus expression in ewes during non-breeding season

Cited by 6 publications

References 28 publications

Strategies to improve the success of fixed‐time artificial insemination in the ewe

Strategies to improve the success of fixed‐time artificial insemination in the ewe

Recent advances in treatments for resynchronization of ovulation in small ruminants: a review

Effectiveness of human recombinant FSH for enhancing reproductive performance of ewes in progesterone injection-based estrus synchronization program

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