Factors in cattle affecting embryo transfer pregnancies in recipient animals

Roper, David; Schrick, F. N.; Edwards, J. L.; Hopkins, Fred M.; Prado, Tulio M; Wilkerson, J. B.; Saxton, Arnold M.; Young, Christopher; Smith, William B

doi:10.1016/j.anireprosci.2018.11.001

Cited by 27 publications

(37 citation statements)

References 14 publications

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“…In addition, when Code I quality embryos were transferred to cranial third of the uterine horn, the highest pregnancy rates were found. Previous studies reported that the embryo transfer to the cranial third of the embryo during the embryo transfer increased the pregnancy rate (Beal, Hinshaw, & Whitman, ; Bó et al, ; Roper et al, ; Scenna et al, ). Normally the embryo reaches from the oviduct into the uterus approximately 6–8 days after fertilization (Bilodeau‐Goeseels & Kastelic, ).…”

Section: Discussionmentioning

confidence: 96%

“…In a previous study with Angus cross beef cows, it was reported that pregnancy rates were lower after embryo transfer when it was difficult to perform (transfer with maximum difficulty, with extreme manipulation of the genital tract, with embryo deposited in the upper half of the uterine horn) (Kasimanickam et al, ). Roper et al () reported that longer duration of the transfer had a negative effect on pregnancy rate and that the pregnancy rate decreased especially when the transfer took longer than 14 min. Excessive uterine manipulation during embryo transfer, difficult passage of the cervix and prolonged application leads to the release of chemical inflammatory mediators such as PGF 2α .…”

Section: Discussionmentioning

confidence: 99%

“…Transfer location in uterine horn, cervix transfer score (time for cervix passing or embryo transfer), developmental stage and quality of embryos, season, parity of recipient (heifer or cow), fresh or frozen transfer, and nutritional status are among the factors affecting pregnancy rates in previously reported embryo transfer studies ( Bényei et al, ; Ferraz et al, ; Leroy et al, ; Roper et al, ). Many factors that affect the pregnancy rates after embryo transfer cause an increase in the application costs and lead to discussions about the success of the programme.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the factors that affect the pregnancy rates during embryo transfer in beef heifers

Alkan

Karaşahi̇n

Dursun

et al. 2020

Reprod Domestic Animals

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The aim of this study was to evaluate the effects of the transfer side, transfer location, cervix transfer score, type and diameter of corpus luteum (CL) during embryo transfer on pregnancy rates in beef heifers. Progesterone‐based synchronization and superovulation protocol were applied to Simmental cows used as donors (n = 168). Uterine flushings were performed on day 7 following artificial insemination. Obtained Code I (excellent or good) and II (fair) quality embryos were transferred to recipient beef heifers (n = 561). During embryo transfer, side of transfer (right or left), transfer location (the cranial or middle third of uterine horn), cervix transfer score (easy, moderate or difficult) and type (CLa, CLb and CLc) and diameter of CL were determined. Pregnancy rates following the transfer of Code I and II embryos were 44.66% and 33.07%, respectively (p < .05). The rates of pregnancy after transfers to the right and left uterine horn were 37% and 42.2%, respectively (p > .05). The pregnancy rates were 41.2%, 34.9% and 30.3% for cervix transfer scores as easy, moderate and difficult, respectively (p > .05). Pregnancy rates after transfer to the cranial third and middle third were 41.06% and 29.67%, respectively (p < .05). According to types of CL, pregnancy rates were 31.7%, 40.4% and 45.3% for CLa, CLb and CLc, respectively (p < .05). Moreover, it was found that as the CL diameter increased, the pregnancy rates increased. As a result, it was concluded that there was no effect of side of transfer and cervix transfer score, but embryo quality, transfer location, type and diameter of CL had significant effects on the pregnancy rate during embryo transfer in beef heifers.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of the factors that affect the pregnancy rates during embryo transfer in beef heifers

Alkan

Karaşahi̇n

Dursun

et al. 2020

Reprod Domestic Animals

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“…Finally, the method to produce the embryo ( in vivo or in vitro ) transferred, influences pregnancy rate ( Pontes et al, 2009 ; Ferraz et al, 2016 ). Furthermore, embryonic quality and development is of vital importance ( Rodrigues et al, 2018 ), as well as the site of placement of the embryo and the time to complete the embryo transfer ( Roper et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Factors associated with pregnancy rate in fixed-time embryo transfer in cattle under humid-tropical conditions of México

2020

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The objective was to determine the effect of some factors on pregnancy rate of fixed-time embryo transfer (FTET), in cows and heifers kept under Mexican tropical conditions. Recipients females (n=405) grazing in pastures were selected according to breed group (Zebu and crosses), parity (nulliparous and multiparous), body condition score (BCS) and the presence of a corpus luteum (CL). The females were synchronized on day 0 using a progesterone vaginal device and 2 mg estradiol benzoate (EB), two groups were established. Group 1 (conventional protocol) were animals in which the progesterone device was removed on day 7. At this time, also received an injection of 50 mg cloprostenol sodium and 1 mg estradiol cypionate. Animals also received 300 IU (heifers) or 360 IU (cows) of eCG. Group 2 (J-Synch protocol) were animals in which the progesterone device was removed on day 6. Cloprotenol and eCG injections were applied as in Group 1. Additionally, on day 9, animals of group 2 received 0.01 mg buserelin acetate. Embryo transfer of in vivo or in vitro was done on day 16 and pregnancy diagnosis was realized by ultrasonography on days 23 and 53 after FTET. Statistical analyses were carried out using Chi-square tests and logistic regression. Pregnancy rate varied between farms (P<0.05). The highest pregnancy rate was for multiparous cows (66%). The recipient utilization rate was better in the J-Synch protocol (85%), and in vivo embryos (75%) had higher pregnancy rate. The diameter of the follicle and the CL had no effect on pregnancy rate (P>0.05). However, the logistic regression determined that the only significant factor on pregnancy rate was the type of embryo. In conclusion, pregnancy rate in FTET females was higher for in vivo embryos than for in vitro embryos in cows evaluated under humid tropical conditions in Mexico.

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“…Ïðè ýòîì, äëèòåëüíîñòü âðåìåíè ïåðåñàäêè, îïðåäåëÿåìàÿ òåõíè÷åñêèì óðîâíåì èíñòðóìåíòàðèÿ è îïûòîì îïåðàòîðà, ÿâëÿåòñÿ äîïîëíèòåëüíûì ôàêòîðîì, ïðè êîòîðîì, âîçìîaeíû ðèñêè îòñóòñòâèÿ ïðèaeèâëÿåìîñòè ýìáðèîíà ïî ïðè÷èíå óòðàòû aeèçíåñïîñîáíîñòè çàðîäûøà è/èëè òðàâìèðîâàíèÿ êàòåòåðîì ðåïðîäóêòèâíûõ îðãàíîâ aeèâîòíîãî, ïàãóáíî âëèÿþùåãî íà ýìáðèîí ïðè åãî ïðÿìîì êîíòàêòå ñ êðîâüþ [28]. Èìåþòñÿ äàííûå èññëåäîâàíèé î ñíèaeåíèè ïîêàçàòåëåé ïðèaeèâëÿåìîñòè ïåðåñàaeåííûõ ýìáðèîíîâ äî 35 % â çàâèñèìîñòè îò äëèòåëüíîñòè ïåðåñàäêè: êîãäà äëÿ çàâåðøåíèÿ ïðîöåäóðû ïåðåñàäêè ïîòðåáîâàëîñü 6 -9 ìèíóò, ïîêàçàòåëü ñòåëüíîñòè ñîñòàâèë 60 %, ïðè 10 -13 ìèíóòàõ -37 %, êîãäà ïåðåñàäêà ýìáðèîíà áûëà çàâåðøåíà â òå÷åíèå 14 -25 ìèíóò, òî ïðèaeèâëÿåìîñòü íå ïðåâûøàëà 25 % [31]. Êðîìå òîãî, äëèòåëüíûå ðåêòîïàëüïàòîðíîå âîçäåéñòâèå ëàäîíüþ îïåðàòîðà íà âíåøíþþ ïîâåðõíîñòü ðîãîâ ìàòêè, íàïðàâëåííîå íà òî, ÷òîáû ïðîäâèíóòü êàòåòåð äëÿ ïåðåñàäêè ýìáðèîíà â âåðõóøêó ðîãà ìàòêè, ìîaeåò âûçâàòü âûñâîáîaeäåíèå ïðîñòîãäàíäèíà F2?…”

Section: äëÿ öèòèðîâàíèÿ / For Citationunclassified

Factors affecting embryo engraftment in recipient cows

Skachkova¹

2019

Vetkorm

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Factors in cattle affecting embryo transfer pregnancies in recipient animals

Cited by 27 publications

References 14 publications

Evaluation of the factors that affect the pregnancy rates during embryo transfer in beef heifers

Evaluation of the factors that affect the pregnancy rates during embryo transfer in beef heifers

Factors associated with pregnancy rate in fixed-time embryo transfer in cattle under humid-tropical conditions of México

Factors affecting embryo engraftment in recipient cows

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