A study on superovulation using FSH and eCG in Awassi ewes

Azawi, O. I.; Al-Mola, M. K. M. A.

doi:10.1007/s11250-009-9489-2

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…However, the latest research was conducted in the breeding season, but we challenged the feeding out of breeding season and anestrous Qezel ewes. In this regard, previous studies confirmed higher ovarian responses during the breeding season than in the non-breeding season in different breeds of ewes [53][54][55]. The breeding season and the cyclicity would probably affect the response of the ovary and uterine environment or even the endocrine system related to reproduction upon incorporating the diet with LO or probably other FAs.…”

Section: Discussionmentioning

confidence: 82%

Effect of varying amounts of linseed oil or saturated fatty acids around insemination on reproductive and blood parameters of ewes

Esmaili¹,

Eslami²,

Khalilvandi-Behrozyar³

et al. 2023

J Anim Sci Technol

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ORCID (for more information, please visit https://orcid.org)Hamed Esmaili (https://orcid.org/my-orcid?orcid=0000-0001-5349-0793)Mohsen Eslami (https://orcid.org/my-orcid?orcid=0000-0001-6298-2909)Hamed Khalilvandi-Behrozyar (https://orcid.org/0000-0002-2834-6260) Farhad Farrokhi-Ardabili (https://orcid.org/0000-0002-6604-1820) Competing interestsNo potential conflict of interest relevant to this article was reported. Funding sourcesState funding sources (grants, funding sources, equipment, and supplies). Include name and number of grant if available.

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Section: Discussionmentioning

confidence: 82%

Effect of varying amounts of linseed oil or saturated fatty acids around insemination on reproductive and blood parameters of ewes

Esmaili¹,

Eslami²,

Khalilvandi-Behrozyar³

et al. 2023

J Anim Sci Technol

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“…The 400 IU dose of eCG favored the percentage of double births and the prolificacy index when modifying the ovulatory rate. A high dose of eCG in estrus induction and synchronization protocols causes a superovulatory effect in ewes and, therefore, an increase in prolificacy (Zeleke et al, 2005;Azawi and Al-Mola, 2010;Quintero-Elisea et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Estrous synchronization in sheep with reused progesterone devices and eCG

López-García¹,

Sánchez-Torres²,

Cordero-Mora³

et al. 2021

Revista Brasileira De Zootecnia

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The objective of the present research was to determine the effect of long synchronization protocols based on reused progesterone devices (controlled internal drug release [CIDR]) associated with different doses of equine chorionic gonadotropin (eCG) on reproductive variables in crossbred sheep (Suffolk × Kathadin × Dorset). The CIDR were used for eleven days in a previous study in sheep from the same herd and were washed and disinfected before reusing. Sixty-four sheep, in the reproductive season, were randomly assigned to four experimental groups (n = 16). Treatments consisted of a group with 10 d CIDR and 300 IU eCG; a group with 10 d CIDR and 400 IU of eCG; a group with 12 d CIDR and 300 IU of eCG; and a group with 12 d CIDR and 400 IU of eCG. A completely randomized design was used. There was an estrous presentation rate of 100% in all treatments. The begining of estrous, gestation rate, fertility rate, type of parturition, and prolificacy index were equal between groups. Progesterone serum concentration was higher in sheep from the 10 d CIDR groups. The CIDR, reused for the second time, associated with 300 or 400 IU of eCG for estrous synchronization in sheep, are effective to obtain good pregnancy rates and ensures higher prolificacy rates.

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“…A number of reports have shown FSH to be superior to eCG in terms of ovulation rate and embryo viability in sheep; for example, FSH produced more embryos than eCG in Suffolk ewes (5.3 vs. 3.5) [70], native Saloia sheep (5.8 and 3.6) [82], and Awassi ewes (4.83 vs. 4.66) [68] (Table 1). Moreover, few attempts have been made at comparing the multidose FSH protocol with the eCG plus FSH single injection (Table 1) [29,35].…”

Section: Gonadotrophins and Superovulationmentioning

confidence: 99%

“…Different gonadotropins exhibit varied superovulatory responses, a detailed discussion of which can be found in the introductory section of this review, and outlined in Table 1 . A number of reports have shown FSH to be superior to eCG in terms of ovulation rate and embryo viability in sheep; for example, FSH produced more embryos than eCG in Suffolk ewes (5.3 vs. 3.5) [ 70 ], native Saloia sheep (5.8 and 3.6) [ 82 ], and Awassi ewes (4.83 vs. 4.66) [ 68 ] ( Table 1 ).Moreover, few attempts have been made at comparing the multidose FSH protocol with the eCG plus FSH single injection ( Table 1 ) [ 29 , 35 ]. In sum, there are discrepancies in the outcomes regarding the use of FSH in combination with eCG, whether it produces a better superovulatory response than FSH alone, and whether this response is improved by multiple injections or a single injection of eCG.…”

Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

“…There is considerable evidence demonstrating the influence of season on the ovarian output in sheep as well as other livestock. Studies conducted on Lacaune ewes in France [ 97 ], Awassi ewes in Iraq [ 68 ], and Santa Inês breedin Brazil [ 23 ] found significantly higher ovarian responses during the breeding season than the non-breeding season. Moreover, although there was no difference in ovulation and quality embryos rate, total embryos recovered were increased during the breeding as compared to the non-breeding season ( Table 3 ) [ 69 ].…”

Section: Factors Affecting Outcomes Of Superovulationmentioning

confidence: 99%

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Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation

Khan

Jamal

et al. 2022

Veterinary Sciences

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Considerable improvements in sheep multiple ovulation and embryo transfer (MOET)protocols have been made; however, unlike for cattle, MOET is poorly developed in sheep, and thus has not been broadly applicable as a routine procedure. The tightly folded nature of the ewe cervix, the inconsistent ovarian response to various superovulatory treatments, and the requirement of labor to handle animals, particularly during large-scale production, has limited the implementation of successful MOET in sheep. Moreover, several extrinsic factors (e.g., sources, the purity of gonadotrophins and their administration) and intrinsic factors (e.g., breed, age, nutrition, reproductive status) severely limit the practicability of MOET in sheep and other domestic animals. In this review, we summarize the effects of different superovulatory protocols, and their respective ovarian responses, in terms of ovulation rate, and embryo recovery and transfer. Furthermore, various strategies, such as inhibin immunization, conventional superovulation protocols, and melatonin implants for improving the ovarian response, are discussed in detail. Other reproductive techniques and their relative advantages and disadvantages, such as artificial insemination (AI), and donor embryo recovery and transfer to the recipient through different procedures, which must be taken into consideration for achieving satisfactory results during any MOET program in sheep, are also summarized in this article.

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A study on superovulation using FSH and eCG in Awassi ewes

Cited by 9 publications

References 5 publications

Effect of varying amounts of linseed oil or saturated fatty acids around insemination on reproductive and blood parameters of ewes

Effect of varying amounts of linseed oil or saturated fatty acids around insemination on reproductive and blood parameters of ewes

Estrous synchronization in sheep with reused progesterone devices and eCG

Towards Improving the Outcomes of Multiple Ovulation and Embryo Transfer in Sheep, with Particular Focus on Donor Superovulation

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