Evaluating the bovine embryo

Shea, Brian F.

doi:10.1016/s0093-691x(81)80016-7

Cited by 109 publications

(46 citation statements)

References 4 publications

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“…However, others have found that there was no significant difference in pregnancy rates between blastocyst and morula embryo transfers [12,19]. The present results of transferring frozen-thawed bovine embryos on day 7 demonstrate that the pregnancy rate with blastocysts was significantly higher than that with compacted morula, and that the pregnancy rate tended to rise as the developmental stage advanced.…”

Section: Discussioncontrasting

confidence: 53%

The Influence of Developmental Stage and Morphological Quality of Frozen-Thawed Bovine Embryos on Pregnancy Rate in Bovine Embryo Transfer.

Nishigai

Kamomae

Tanaka

et al. 1999

Journal of Reproduction and Development

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Abstract.To investigate the influence of post-thawed embryonic developmental stage and postthawed morphological quality on pregnancy rate, frozen embryos, which had been collected from Japanese Black beef cattle and qualified as morphologically excellent before freezing, were thawed by the stepwise method and transferred non-surgically to Holstein heifers on day 7 (day 0=onset of estrus). The transferred embryos ranged in development from compacted morula to blastocyst stage and were evaluated as either morphologically excellent or good quality just after thawing. Pregnancy rates of 62.0% (49/79), 66.7% (26/39), and 81.0% (34/42) were achieved in the transfers of the compacted morula, early blastocyst, and blastocyst stages, respectively, for the transfer of the excellent quality embryos. The pregnancy rate obtained with blastocyst stage embryos was significantly (P<0.05) higher than that obtained with compacted morula embryos. The pregnancy rate of morphologically excellent quality embryos of the compact morula stage was 62.0% (49/79), and that of the good quality embryos of the compacted morula stage was 58.3% (7/12) revealing no significant difference between the two morphological qualities. These results indicate that the pregnancy rate increases as the embryonic developmental stage advances from compacted morula to early blastocyst, and that post-thawed morphological qualities, excellent and good quality, have no influence on pregnancy rates for frozen-thawed embryos that are transferred to bovine recipients on day 7 of estrus.

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Section: Discussioncontrasting

confidence: 53%

The Influence of Developmental Stage and Morphological Quality of Frozen-Thawed Bovine Embryos on Pregnancy Rate in Bovine Embryo Transfer.

Nishigai

Kamomae

Tanaka

et al. 1999

Journal of Reproduction and Development

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“…Rowson et al (1971) suggested that competition between embryos within a single uterine horn seemed to occur after unilateral transfer of two embryos. Rowson et al (1972) (Rowson et ai, 1971;Sreenan et al, 1975Sreenan et al, , 1978Anderson et al, 1978) and with that reported after unilateral transfer of two embryos (Boland et ai, 1975;Testart et ai, 1975 (Rowson et al, 1969;Hasler et al, 1987 (Shea, 1981;Lindner & Wright, 1983;King et al, 1985;Hasler et al, 1987). The transfer of embryos produced in vitro evaluated as morphologically excellent, good or fair, resulted in a higher pregnancy rate than the transfer of poor embryos ( Table 2).…”

Section: Pregnancy Diagnosismentioning

confidence: 75%

Pregnancy rates and births after unilateral or bilateral transfer of bovine embryos produced in vitro

Reichenbach¹,

Liebrich²,

Berg³

et al. 1992

Reproduction

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“…Estes dados são semelhantes aos de LINDNER e WRIGHT (1983), com coletas no sétimo dia. A menor ou maior porcentagem de um determinado estádio de desenvolvimento é uma função do dia em que a coleta foi realizada (SHEA, 1981), e da raça do animal utilizado. COELHO (1986) coletou embriões no sétimo dia e encontrou maior percentagem de mórula compacta e blastocisto jovem para os animais da subespécie Bos taurus taurus, e mórula e mórula compacta em Bos taurus indicus.…”

Section: Resultsunclassified

Resposta superovulatória de novilhas mestiças holandês-zebu tratadas com somatotropina bovina recombinante (rbST)

Borges¹,

Torres²,

Ruas

et al. 2001

R. Bras. Zootec.

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RESUMO -O objetivo do experimento foi estudar o efeito do pré-tratamento com 500 mg de sometribove (rbST) sobre a resposta superovulatória, o número e a qualidade dos embriões coletados de 26 novilhas mestiças holandês-zebu, divididas em dois tratamentos: T1 = tratadas com rbST (n=13) e T2 = controle (n=13). Foram feitas 13 superovulações entre o mês de setembro e o início de dezembro de 1997 (período 1) e 13 superovulações entre o final do mês dezembro de 1997 e fevereiro de 1998 (período 2), sendo que, para cada período, sete animais receberam 500 mg de rbST (T1) por via subcutânea, no terceiro dia do ciclo estral, e seis animais (T2) não receberam medicação. Os animais foram superovulados com FSH a partir do 10 o dia do ciclo estral, e as coletas foram realizadas entre os dias 7 e 8 após a inseminação artificial. A resposta superovulatória, o número total de estruturas, o número de embriões viáveis, de não-viáveis e de ovócitos não foram afetados pelo tratamento com somatotropina bovina. Foram coletadas médias de 15,3 ± 9,5 e 17,4 ± 10,9 estruturas totais, 8,5 ±8,3 e 11,5 ± 10,0 embriões viáveis, 4,6 ± 4,7 e 3,4 ± 1,3 embriões não-viáveis, 2,2 ± 2,8 e 2,8 ± 4,0 ovócitos por coleta dos tratamentos 1 e 2, respectivamente. As mórulas e os blastocistos jovens foram os estádios de desenvolvimento coletados em maior percentagem, entre o sétimo e oitavo dia após a inseminação artificial.Palavras-chave: embriões, FSH, hormônio de crescimento Superovulatory Response of Holstein-Zebu Crossbred Heifers Treated with Recombinant Bovine Somatotropin (rbST)ABSTRACT -The objective of the experiment was to study the effect of pretreatment with 500 mg of sometribove (rbST) on superovulatory response, on number and embryos quality of twenty six crossbred holstein-zebu heifers, allocated into two treatments: T1 -treated with rbST (n=13) and T2 -control (n=13). Thirteen superovulations were done between september and december of 1997 (period 1), and thirteen superovulations between the end of december 1997 and february of 1998 (period 2). For each period seven animals were injected with 500 mg SC sustained-release formulated rbST (T1) on day 3 of estrous cycle, while six animals (T2) did not receive any medication. The animals were superovulated with FSH on day 10, and the embryo collection were performed on day 7 or 8 after the artificial insemination (A.I.). Pretreatment of heifers with rbST did not increase the superovulatory response, total number of structures recover, viable and non viable embryos and ova per collection. The average of total number of structures recovered, viable and non viable embryos and ova per collection were: 15.3 ± 9.5 and 17.4 ± 10.9; 8.5 ± 8.3 and 11.5 ± 10.0; 4.6 ± 4.7 and 3.4 ± 1.3; 2.2 ± 2.8 and 2.8 ± 4.0, respectively, for T1 and T2. The morulae and initial blastocists were recovered in greater percentage on day 7 or 8 after A.I.

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Evaluating the bovine embryo

Cited by 109 publications

References 4 publications

The Influence of Developmental Stage and Morphological Quality of Frozen-Thawed Bovine Embryos on Pregnancy Rate in Bovine Embryo Transfer.

The Influence of Developmental Stage and Morphological Quality of Frozen-Thawed Bovine Embryos on Pregnancy Rate in Bovine Embryo Transfer.

Pregnancy rates and births after unilateral or bilateral transfer of bovine embryos produced in vitro

Resposta superovulatória de novilhas mestiças holandês-zebu tratadas com somatotropina bovina recombinante (rbST)

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