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AN OVERVIEW ON CRYOPRESERVATION AND THAWING METHODS OF RABBIT EMBRYOS USED IN EMBRYO TRANSFERE.

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Last updated: 04 Jan 2025

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Abstract

To defined the differences in ability of NZW rabbit embryos to survive with different freezing methods (vitrification, step wise and direct methods), donor does were i.m. injected with 75 unit from PMSG 72 h before mating and embryos were collected from slaughtered does 72 h after natural mating. Each preservation method was followed by special thawing method, or by one method (thawing of direct method). After thawing, embryos were in vitro cultured in TCM-199 for three days and embryo characteristics were measured. Results revealed that during cryostorage, mucin coat (MC) was thicker (P<0.05) for vitrification and direct methods than that for step wise method (111 and 114 vs. 104.8 µm, respectively). Thickness of zona pellucid (ZP) was thicker (P<0.05) for step wise and direct methods than that for vitrification method (23.9 and 23.9 vs. 21.8 µm, respectively). However, diameter of intrazonal (IZ) and total embryo (TE) was not affected significantly by preservation method. Only, thickness of MC and ZP reduced (P<0.05) post- than pre-preservation. Post thaw embryo recovery rate was higher (P<0.05) in direct method than vitrification and step wise methods (100% vs. 91.3 and 90%, respectively). Up to the 2nd day of culture, direct method resulted in the highest (P<0.05) viability rate, followed by step wise, while vitrification showed the lowest values. At the 3rd day of culture, step wise method showed the best (P<0.05) viability rate; followed by direct method, while vitrification still to be the lowest. Viability rate of embryos after preservation by three methods, thawed by one method, and in vitro cultured at three successive days show that, direct preservation method resulted in significantly (P<0.05) the highest viability rate (100%), followed by step wise (71.4%), while vitrification showed the lowest values (57.1%). No viable embryos were obtained on the 3rd day of culture with vitrification method and 85.7% of thawed embryos were examined in hatched blastocyst stage with direct method on the 3rd culture day versus 28.6% with step wise method. As affected by culture day after thawing, thickness of MC and diameter of IZ and TE increased (P<0.05) and thickness of ZP decreased (P<0.05) by progressing culture day. In conclusion, cryostorage of embryos recovered from superovulated rabbits after 72 of mating could be carried out successfully by direct method without harmful effects on embryo characteristics, yielded the highest number of good quality embryos on thawing and supported the highest in vitro development of embryos to hatched blastocyst stage.

DOI

10.21608/jappmu.2008.217769

Keywords

Rabbit, embryo characteristics, Vitrification, step wise, Direct method, viability rate

Authors

First Name

A.

Last Name

Hussein,

MiddleName

M.

Affiliation

Anim. Prod. Res. Institute, Agric. Res. Center.

Email

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Orcid

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First Name

E.

Last Name

Abdel-Khalek

MiddleName

-

Affiliation

Anim. Prod. Dept., Fac. Agric., Mansoura University.

Email

-

City

-

Orcid

-

First Name

E.

Last Name

El-Siefy

MiddleName

M.E.

Affiliation

Anim. Prod. Res. Institute, Agric. Res. Center.

Email

-

City

-

Orcid

-

First Name

M.

Last Name

El-Baz

MiddleName

M.

Affiliation

Anim. Prod. Res. Institute, Agric. Res. Center.

Email

-

City

-

Orcid

-

First Name

M.

Last Name

El-Sherbieny

MiddleName

A.

Affiliation

Anim. Prod. Res. Institute, Agric. Res. Center.

Email

-

City

-

Orcid

-

First Name

S.

Last Name

Sweify

MiddleName

A.

Affiliation

Anim. Prod. Res. Institute, Agric. Res. Center.

Email

-

City

-

Orcid

-

Volume

33

Article Issue

3

Related Issue

31000

Issue Date

2008-03-01

Receive Date

2008-02-25

Publish Date

2008-03-01

Page Start

1,895

Page End

1,907

Print ISSN

2090-3642

Online ISSN

2090-3723

Link

https://jappmu.journals.ekb.eg/article_217769.html

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https://jappmu.journals.ekb.eg/service?article_code=217769

Order

9

Type

Original Article

Type Code

876

Publication Type

Journal

Publication Title

Journal of Animal and Poultry Production

Publication Link

https://jappmu.journals.ekb.eg/

MainTitle

AN OVERVIEW ON CRYOPRESERVATION AND THAWING METHODS OF RABBIT EMBRYOS USED IN EMBRYO TRANSFERE.

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Article

Created At

22 Jan 2023