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Embryo transfer The success rate of the embryo transfer depends upon many different factors but it is mostly related to the fertility and age of the donor and recipient mare, synchrony between donor and recipient mare and semen quality of the stallion. The embryos of subfertile mares are affected by the poor uterine environment between arrival in the uterus on day five and embryo flush on day seven or eight. Embryo recovery from donor mares bred with frozen semen is usually lower than that for donor mares bred with fresh or cooled semen. www.maremeadows.com /Articles/embryotrx.htm   (1075 words)

Embryo Transfer Embryos are generally transferred back to the woman's uterus at the 2 - 8 cell stage, which occurs 48 - 72 hours after the retrieval. During the two weeks after the embryo transfer while a couple is anxiously awaiting the outcome of their IVF cycle, the time will pass more slowly and stressfully if a woman confines herself to bed. Embryos that are not transferred may be frozen for use in subsequent cycles. www.infertilityny.com /embryotransfer.htm   (747 words)

Embryo transfer - Wikipedia, the free encyclopedia Embryo transfer refers to a step in the life and times of in vitro fertilization (IVF) whereby one or several embryos are placed into the uterus of the female with the intent to establish a pregnancy. Embryos can be either "fresh" from fertilized egg cells of the same menstrual cycle, or "frozen", that is they have been generated in a preceding cyle, cryopreserved, and are thawn just prior to the transfer. In a natural or stimulated cycle, the embryo transfer takes place in the luteal phase at a time where the lining is appropriately developed in relation to the status of the embryo. en.wikipedia.org /wiki/Embryo_transfer   (529 words)

Embryos alive Embryo survival rates after thawing and pregnancy rates in most IVF programs are highest for embryos that were frozen at the pronuclear stage, or at the 2-cell to 4-cell stage. Embryo transfer is planned for 3-6 days later - depending on the stage of development of the embryos to be replaced. Embryo morphology (appearance of the cells / percentage of fragmentation) is one of the most influential factors for embryo survival. www.embryosalive.com /transferandtechniques.php   (2247 words)

Embryo Transfer In Vitro Fertilization IVF The embryo transfer procedure is the last one of the in vitro fertilization process. The embryo transfer catheter is loaded with the embryos and the physician passes it through the cervical opening up to the middle of the uterine cavity. At our IVF clinic, the number of embryos to be transferred is decided by the couple after a discussion with Dr. Sherbahn regarding their embryo quality and how it impacts on the risks for multiple pregnancy versus the risk of failing to conceive at all. www.advancedfertility.com /embryotransfer.htm   (815 words)

Equine Embryo Transfer   (Site not responding. Last check: 2007-11-03) Embryo transfer can also be used to produce foals from subfertile mares that are unable to successfully carry a foal to term. Embryo transfer involves the use of a donor and recipient mares who must be synchronized in their estrous cycles. When transferring the embryo to the recipient mare, it is important she ovulated no more than one day before and three to five days after the donor mare. www.vet.purdue.edu /horses/equineembryotransfer.htm   (546 words)

Genetics & IVF Institute Until recently, culture of embryos, in the laboratory, to the blastocyst stage was very difficult because the several culture media that were used to supply nutrients to the embryos were inadequate for extended embryo growth in the laboratory. Transfer occurs closer to the natural time that an embryo enters the uterus when the uterine lining may provide a better environment for the embryo. Blastocyst transfer may become the routine method of embryo transfer or it may be limited to selected subgroups of patients. www.givf.com /fertility/blastocyst.cfm   (1282 words)

Embryo transfer Embryo transfer has now been simplified with the advent of new knowledge which allows frozen embryos to be thawed very quickly and transferred immediately to recipient females. As embryo transfer is carried out at seven days after the onset of oestrus, the technique is more difficult than AI and requires considerable training and experience. In particular, the transfer of embryos which are likely to produce calves of a size or shape which will cause problems at calving, or increased likelihood of caesarean section, is unacceptable. www.fawc.org.uk /reports/dairycow/dcowr048.htm   (498 words)

chronicles Embryo transfer is a technique where embryos are harvested before they are attached to the uterus. For goats and sheep, the embryo transfer technique most often used is a surgical procedure, both for collecting the embryos and for transferring them into the recipients. The embryos may also be micromanipulated to split them into two usable halves, or, with the use of new biotechnology procedures for DNA testing, the sex of the embryo may be determined with a greater than 90% accuracy. www.embryobec.com /TEang.html   (638 words)

American Pregnancy Association: Infertility: Embryo Transfer Embryo transfer is a simple procedure that follows in vitro fertilization (IVF) and is often considered the simplest and final step of the in vitro fertilization process. Transferring more than four is believed to result in excess numbers of multiple pregnancies, which increases the possibility of other complications. Transferring four embryos versus one or two increases the probability that pregnancy will occur, but it is important to realize that all four embryos could implant. www.americanpregnancy.org /infertility/embryotransfer.html   (706 words)

Embryo Transfer Embryo transfer is now an everyday occurrence in cattle, but it is still in its infancy -- so to speak -- in exotic animals. Non-surgical embryo collection and transfer has been tried experimentally in larger wild animals in zoos, but the ferret was a greater challenge because its reproductive anatomy is on a much smaller scale. The embryos are transferred, using catheters of similar size, to a surrogate mother who has been hormonally treated with human chlorionic gonadotropin so that her uterus is in synchrony with that of the embryo donor. www.news.cornell.edu /Chronicle/96/5.23.96/embryo.html   (907 words)

Fertility Treatment: Embryo Transfer in IVF Embryo transfer is one of the most important parts of the IVF process. Embryo transfer is completed after your eggs have been fertilized by your partner’s sperm and they have been through the embryo culture process. Embryo transfer is usually performed once your embryos have been cultured to the right stage. sharedjourney.com /define/transfer.html   (990 words)

Training manual for embryo transfer in cattle In cattle, embryos are routinely transferred to the uterine horn. The actual embryo transfer process is similar to the method used for artificial insemination, except that the transfer gun is passed well up the uterine horn ipsilateral to the corpus luteum. Perhaps the most venerable principle of embryo transfer is that the stage of the reproductive cycle of the recipient must correspond to that of the donor or physiological stage of development of the embryo. www.fao.org /DOCREP/004/T0117E/T0117E08.htm   (2506 words)

Training manual for embryo transfer in cattle There are two broad criteria for selecting donors for most embryo transfer programmes: (1) genetic superiority, that is animals that contribute to the genetic objectives of the programme, and (2) likelihood of producing large numbers of usable embryos. If embryo transfer work is done on an essentially daily basis, with an average of two or more donors per day, most of the recipients coming into oestrus will be required as recipients, and oestrus synchronization will not be advantageous on most days. For an embryo transfer programme, the use of detector bulls, vasectomized or with a blocked or deviated penis, is not advisable because bulls may spread venereal disease. www.fao.org /DOCREP/004/T0117E/T0117E03.htm   (3654 words)

ivf-infertility.com | Embryo freezing (cryopreservation) Freezing all embryos for subsequent transfer may be advised for women who are at a high risk of developing severe ovarian hyperstimulation syndrome following ovarian stimulation for in-vitro fertilization (IVF). When embryo implantation may be compromised in cases such as the presence of endometrial polyps, poor endometrial development, break through bleeding near the time of embryo transfer or illness. In some countries, it is mandatory to freeze all embryos created from donated eggs, quarantined for a period of six months and until the donor have a repeat negative screening tests. www.ivf-infertility.com /ivf/frozen.php   (292 words)

Blastocyst culture and transfer for in vitro fertilization IVF The blastocyst culture and transfer procedure for in vitro fertilization facilitates selection of the best quality embryos for transfer to the uterus of the mother. The ultimate goal of in vitro fertilization (IVF) and embryo culture is to provide high quality embryos which are capable of continued normal development and result in live births. This low rate of embryo development is the result of a less than optimal culture environment for the embryos. www.advancedfertility.com /blastocy.htm   (580 words)

Embryo Transfer   (Site not responding. Last check: 2007-11-03) Gumz Farms is an embryo transfer recovery facility and transports the embryo to a commercial mare recipient herd to obtain a viable pregnancy and resulting foal. The collected embryo(s) is washed to remove any contaminants and evaluated for viability based on their size, grade, morphology and developmental stage. When transferring the embryo to the recipient mare, it is important that she had ovulated no more than one day before and two days after the donor mare. www.gumzfarms.com /embryo_transfer.htm   (620 words)

RSC Bay Area - Blastocyst Embryo Transfer There is now abundant evidence that transferring Blastocyst (the embryonic stage just prior to hatching and implantation) embryos into the uterus five to six days after egg retrieval results in higher implantation rates per embryo transferred compared to embryos transferred after three days of in vitro development. Blastocyst transfer may be of particular benefit for patients who develop many good quality embryos and want to limit their risk of a multiple pregnancy by transferring fewer embryos with higher potential for implantation. A possible risk with attempting a blastocyst transfer is that none of the embryos may develop to the blastocyst stage (an average of 40% of fertilized eggs develop to the blastocyst stage); therefore, there would be no embryos to transfer. www.rscbayarea.com /articles/blastocyst_transfer.html   (751 words)

Equine Reproduction Concepts - Embryo Transfer Donor mare is stabled at ERC for breeding, embryo recovery and transfer. Embryo will be transferred into a client-owned recipient mare trailered to ERC for embryo transfer procedures. An embryo can then be sent to ERC via airlines or federal express and transferred into a recipient mare maintained at our facility. equinereproduction.com /embryotransfer.htm   (389 words)

Moral Exploration of Single Embryo Transfer   (Site not responding. Last check: 2007-11-03) Moreover, if research toward optimal embryos extends to their genetic makeup, creating the potential for redefining what is a "healthy" embryo, the results of this research could be used for morally problematic enhancement procedures as well as therapeutic strategies directed towards assisting women to become pregnant. For example, research to improve embryo health that allows for the sole transfer of an optimal embryo might lead to a demand for IVF from fertile persons who want to optimize the "health" of their child using not only environmental (physical and social) means, but also genetic means. So for example, with single embryo transfer, there is the choice to do it, the choice of which embryo to transfer, and choice of what to do with embryos that were not or have not yet been transferred. publish.uwo.ca /~cmcleod2/moral.htm   (2700 words)

Embryo Transfer Preserves Genetics, Sidesteps PRRS Embryo transfer technology has transformed Arnold Ypma's herd of 280 purebred Duroc sows from an all-PRRS-positive (porcine reproductive and respiratory syndrome) herd to an all-negative status. Embryo transfers were completed in eight batches over a nine-month period. The embryos collected/donor are enough to transfer to 1.7 sows on average, he explains. nationalhogfarmer.com /mag/farming_embryo_transfer_preserves   (624 words)

IVF: Frozen Embryo Transfer Embryos can be cryopreserved at various times after fertilization, ranging from one day after fertilization up to five or six days after. Embryo cryopreservation allows your embryos to be kept healthy and viable for up to ten years. Before your embryos can be thawed and transferred, you and your reproductive endocrinologist need to decide how many embryos to transfer into your uterus. sharedjourney.com /ivf/fet.html   (1043 words)

Embryo Transfer We generally transfer embryos from the petri dish to the woman’s uterus on the third day after the egg retrieval. For patients ages 36 and under, only two embryos are generally transferred to reduce the risk of high order multiple pregnancy (triplets or more). It became clear that transferring embryos at the blastocyst stage increased the chance of identical twinning, for unknown reasons. cms.clevelandclinic.org /obgyn/body.cfm?id=174   (252 words)

ivf-infertility.com | Blastocyst embryo transfer Recently, the use of sequential culture medium (the embryos are cultured in different media according to their stage of growth) has enabled a larger number of embryos to develop into blastocysts. The rational behind a blastocyst transfer is that an embryo which has failed to reach the blastocyst stage, would be unlikely to have resulted in a pregnancy. Transfer of one or two blastocysts is recommended to avoid high-order multiple pregnancies. www.ivf-infertility.com /ivf/blastocysts.php   (438 words)

Page1   (Site not responding. Last check: 2007-11-03) Embryo transfer is an artificial method of breeding whereby newly formed embryos are removed from a female and then transferred to another female of the same species where they can develop. Embryonic Transfer is a simple precedure that follows in vitro fertilization (IVF) and is often considered the simplest and final step of the in vitro fertilization process. A predetermined number of embryos are loaded into a fine transfer catheter which is pased through the cervix. www.geocities.com /coolalyssakevin/Page1.html   (262 words)

AQHA - EMBRYO / OOCYTE TRANSFER Embryo and oocyte transfer are processes of taking the embryo from one mare and placing it in the womb of another mare to carry to term. Embryo transfer: the donor mare is bred and the fertilized egg is removed and placed into a recipient mare. Oocyte transfer: an unfertilized egg is removed from the donor mare and placed into a recipient mare and the recipient mare is then bred. www.aqha.com /association/registration/embryo.html   (1033 words)

Embryo Transfer in Mares Embryo transfer is an assisted reproduction technique by which an embryo is transferred from the uterus of a donor mare to the uterus of a recipient mare that will carry the pregnancy to term. The donor and recipient mares are synchronized with the use of hormones; tight synchronization is important to ensure that the embryo is transferred into an appropriate uterine environment. Prior to attempting embryo recovery, all utensils and media should be warmed to body temperature in an incubator to avoid cold shock to the embryo. www.petplace.com /horses/embryo-transfer-in-mares/page1.aspx   (1163 words)

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