Evaluation of a transcervical AI technique for transferring embryos in sheep

Buckrell, B.C.; Gartley, Cathy; Buschbeck, C.; Jordan, P.; Walton, J.W.

doi:10.1016/0093-691x(93)90052-7

Cited by 8 publications

(3 citation statements)

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“…Three major characteristics of these catheters are: minimum diameter, eccentric tip (which allows the passage through eccentric rings), and rigidity (more effective in progression but also more traumatic in comparison with flexible catheters). Modified catheters achieve uterus in a high proportion of attemps (60–85%) but fertility results are lower (from 10% to 40%) when compared with uterine deposition by laparoscopy (50–70%) (Buckrell et al. 1993; Windsor et al.…”

Section: Artificial Insemination Proceduresmentioning

confidence: 99%

Improvement Strategies in Ovine Artificial Insemination

Anel

Álvarez

Martínez‐Pastor

et al. 2006

Reprod Domestic Animals

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Artificial insemination in ram is scarcely widespread comparing with other domestic species. This has been due not only to fertility results being irregular and low but also because of the difficulty in the application of enhancements such as the use of frozen-thawed sperm. Although there is a lot of information on the use of different options to improve these AI results (such as transcervical application, the use of thawed sperm, etc.) commercial programmes can be classified on two general categories: those using refrigerated semen (15 degrees C) by superficial intracervical deposition (vaginal), and, more restricted, those using thawed sperm by intrauterine deposition (laparoscopy). In the present work, we have summarized our viewpoint on three general research lines for the improvement of AI results in sheep: semen preservation, AI procedures and semen assessment. Briefly, in ram it is necessary to develop a medium term methodology of sperm refrigeration (3-5 days), which would allow the distribution of sperm doses to a widespread area. Nevertheless, it is also necessary to develop an intrauterine transcervical AI technique, which allows thawed semen to be applied by vaginal insemination. Besides, the low predictive value of classic assessment techniques limits the ability to adjust the number of spermatozoa per dose according to its actual fertility.

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Section: Artificial Insemination Proceduresmentioning

confidence: 99%

Improvement Strategies in Ovine Artificial Insemination

Anel

Álvarez

Martínez‐Pastor

et al. 2006

Reprod Domestic Animals

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“…The use of a moderately invasive laparoscopic technique involving a modifi ed AI aspic (IMV, L'Aigle, France) allowed the transfer of in vivo embryos into 15 to 20 ewes per hour with a high pregnancy rate (McMillan and Hall, 1994). Transcervical transfer of embryos in sheep has not yet proven to be effi cacious, with one study producing only one pregnancy following the transfer of 37 embryos into 15 recipients (Buckrell et al, 1993).…”

Section: Sheep and Goatsmentioning

confidence: 99%

Embryo Transfer andin vitroFertilization

Hasler¹

2007

Comparative Reproductive Biology

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“…Recently a laparoscopic technique, similar to that used for the insemination of ewes, has been developed and applied successfully (McKelvey et al, 1985a;McKelvey et al, 1985b;Walker et al, 1985;McMillan and Hall, 1994). More recently, nonsurgical transcervical and laparoscopic ER and transcervical ET methods have been developed (Mylne et al, 1992;Buckrell et al, 1993;Flohr et al, 1999) and, although the results are promising, they still must be improved and tested (Cognie, 1999). Transcervical ER and ET has been attempted in the sheep and goat but the recovery and pregnancy rates are still low and highly variable, therefore more work is needed to improve the results before the procedure could be accepted by the practitioners (Flores-Foxworth et al, 1992;Buckrell et al, 1993;McKelvey et al, 1997).…”

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confidence: 99%

Studies on factors affecting superovulation and embryo transfer in Hungarian Merino ewes

Solti¹,

Cseh²

2001

AVet

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The objectives of this study were (a) to assess the ovulatory response and embryo production of Hungarian Merino ewes after superovulation, (b) to investigate the factors influencing the efficiency of embryo transfer (ET) in Hungarian Merino ewes, (c) to compare the results of two ovarian stimulation protocols (PMSG and PMSG+FSH treatment) in Hungarian Merino ewes, and (d) to study how superovulation, laparoscopic insemination and surgical embryo retrieval (ER) affect the subsequent reproduction of Hungarian Merino donor females after an ET programme. There was no significant difference between the ovarian stimulation protocols in the ratio of donor ewes responding to superovulation nor in the average number of corpora lutea. However, the number of transferable embryos recovered per donor ewe was higher in the PMSG+FSH group. The proportion of transferable embryos, unfertilised oocytes and degenerated embryos did not differ between the treatment protocols. The total pregnancy rate was 53.4% (179/335). Neither the developmental stage of the embryo nor the number of transferred embryos affect the implantation of embryos. However, the increased number of transferred embryos positively influenced the pregnancy rate. No difference was found in the pregnancy rate between synchronised and nonsynchronised groups of recipients. Thirty-six out of 45 donor ewes (80%) became pregnant within one year after the ET programme, indicating that ovarian stimulation and surgical ER did not affect adversely their reproduction.

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Evaluation of a transcervical AI technique for transferring embryos in sheep

Cited by 8 publications

References 0 publications

Improvement Strategies in Ovine Artificial Insemination

Improvement Strategies in Ovine Artificial Insemination

Embryo Transfer andin vitroFertilization

Studies on factors affecting superovulation and embryo transfer in Hungarian Merino ewes

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