Embryo development and follicular status of Toggenburg does fed urea diet

Amorim, L. S.; Torres, Ciro Alexandre Alves; Siqueira, L. G. B.; Fonseca, J. F. da; Guimarães, José Domingos; Carvalho, G. A.; Alves, Nadja Gomes; Oliveira, Margarida Maria Nascimento Figueirêdo de

doi:10.1590/s1516-35982011000200007

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…Although there are no studies comparing NSER technique in sheep and goats, it is presumed that goat cervix is easier to transpose than sheep cervix. More recent, studies had shown 100% cervical transposing in donor goats [14,47]. In both sheep and goats, drugs or their equivalents that mimic physiological conditions for natural cervix relaxation are used.…”

Section: Cervical Dilation and Transposingmentioning

confidence: 99%

“…In both sheep and goats, drugs or their equivalents that mimic physiological conditions for natural cervix relaxation are used. In goats, the use of PGF2a analogues alone is sufficient to promote adequate cervix relaxation [11,14,47]. In sheep, PGF2a analogues are also used and showed relative success in nonsurgical uterine flushing in Santa Inês females [12,36].…”

Section: Cervical Dilation and Transposingmentioning

confidence: 99%

“…The NSER is reported using different types of catheter with [8,11] or without balloon [12,14]. Some reports include the use of Foley [21], urethral [47,50], and recently, a special catheter developed by our team for uterine flushing in goats and sheep [14]. All catheters need a mandrel to reduce flexibility and help cervical transposing.…”

Section: Cervical Dilation and Transposingmentioning

confidence: 99%

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Nonsurgical embryo recovery and transfer in sheep and goats

et al. 2016

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The embryo transfer techniques used in small ruminants worldwide are based in surgical procedures. These actions are performed under general anesthesia which needs a combination of animal fasting and drugs for secure animal handling and surgery manipulations. Therefore, it involves risks to animal health and life. The major limiting sequels are adhesions formed by the abdominal surgery, in the ovaries, uterus, or between them. These occurrences can both compromise uterus accessing and oocyte capture and are responsible for decreasing success and limiting successive embryo collections. In contrast, nonsurgical embryo procedures can be performed in a relatively simplified way. Nonsurgical embryo recovery does not need animal prolonged starvation, drug retention is minimized, and donors can stay in a standing position. After the end of embryo recovery, donors are promptly restored to their routine housing and feeding. Furthermore, this technique does not need incisions and, therefore, can be used repetitively in superovulated or nonsuperovulated goats and sheep for embryo recovery-a similar procedure done in cattle. In Brazil, promising results are reported using nonsurgical embryo transfer in recipient goats, and studies are currently evaluating similar procedures in sheep. Therefore, this review aimed to present the current panorama of nonsurgical embryo transfer in sheep and goats.

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Section: Cervical Dilation and Transposingmentioning

confidence: 99%

Section: Cervical Dilation and Transposingmentioning

confidence: 99%

Section: Cervical Dilation and Transposingmentioning

confidence: 99%

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Nonsurgical embryo recovery and transfer in sheep and goats

et al. 2016

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Review: Non-surgical artificial insemination and embryo recovery as safe tools for genetic preservation in small ruminants

Souza-Fabjan

Oliveira

Guimarães

et al. 2023

animal

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Non-surgical embryo transfer in goats and sheep: the Brazilian experience

Fonseca

Oliveira

Brandão

et al. 2019

Reprod. Fertil. Dev.

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Brazil has presented tremendous progress in non-surgical embryo transfer (NSET) in sheep and goats. New instruments and techniques for non-surgical embryo recovery (NSER) and NSET in small ruminants were implemented. Recent improvements include refinement of the protocols for cervical relaxation combining oestradiol–oxytocin–cloprostenol treatment at specific times before NSER in sheep; recipient goats do not require any hormonal drugs to induce cervical dilation and direct embryo transfer by the cervical route yields excellent results. Transrectal ovarian ultrasonography (B-mode but especially colour Doppler) have proven to be accurate methods to localise and enumerate corpora lutea and luteinised unovulated follicles in recipient and donor does and ewes. An array of new criteria for selecting superior animals for NSER and NSET (e.g. cervical mapping) have been developed by Brazilian researchers. Extensive studies on both technologies were initially conducted in commercial breeds of goats and sheep but have been gradually extended to some native breeds of sheep (germplasm conservation) and dairy goat operations. It is speculated that, in future, NSER and NSET may become methods of choice for caprine and ovine embryo recovery and transfer in Brazil, and then globally. Due primarily to the efficiency of NSET in goats, a novel interspecies (e.g. bovine) IVP method may soon be developed on a large scale. The Brazilian experience is an invaluable source of information and know-how promoting the replacement of conventional surgical assisted reproductive technologies with non-surgical procedures and hence supporting the rapid development of the embryo transfer industry in small ruminants.

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Embryo development and follicular status of Toggenburg does fed urea diet

Cited by 6 publications

References 30 publications

Nonsurgical embryo recovery and transfer in sheep and goats

Nonsurgical embryo recovery and transfer in sheep and goats

Review: Non-surgical artificial insemination and embryo recovery as safe tools for genetic preservation in small ruminants

Non-surgical embryo transfer in goats and sheep: the Brazilian experience

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