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Effect of embryo developmental stage and culture conditions on number and quality of ovine in vitro produced blastocysts

Published online by Cambridge University Press:  01 August 2006

R.M. Garcia-Garcia*
Affiliation:
Departamento Reproducción Animal, INIA, Madrid, Spain
V. Dominguez
Affiliation:
Departamento Reproducción Animal, INIA, Madrid, Spain
A. Gonzalez-Bulnes
Affiliation:
Departamento Reproducción Animal, INIA, Madrid, Spain
A. Veiga-Lopez
Affiliation:
Departamento Reproducción Animal, INIA, Madrid, Spain
M.J. Cocero
Affiliation:
Departamento Reproducción Animal, INIA, Madrid, Spain
*
All correspondence to: R.M. Garcia-Garcia, Dpto. de Fisiologia Animal, Facultad de Veterinaria, Universidad Complutense, Avda Puerta de Hierro s/n, 28040 Madrid, Spain. Tel: +34 91 3943842. Fax: +34 913943864. e-mail: rosa.garcia@vet.ucm.es

Summary

This study evaluated the final output and quality of in vitro produced blastocysts derived from in vivo recovered sheep embryos cultured at various early developmental stages to blastocyst. A total of 270 embryos were recovered from the oviduct, at different days of the early luteal phase, and were classified into three different developmental stages: 2- to 4-cell (n = 93); 5- to 8-cell (n = 92) and 9- to 12-cell (n = 85). The effect of culture conditions was studied, at the same time, by randomly allocating the embryos to one of four groups: three groups of culture with fresh oviduct monolayers (2, 4 and 5 days old) and a fourth group with 2-day monolayers derived from frozen-thawed oviduct cells. Two control groups were established: first, embryos cultured in semi-defined medium (n = 29) and, second, blastocysts obtained in vivo and cryopreserved (n = 43). Influence on blastocyst yield of embryo developmental stage at the start of culture was statistically significant (p < 0.001). Two- to four-cell embryos showed a significantly lower developmental rate (67.7%) than the 5- to 8-cell (83.6%; p < 0.001) and 9- to 12-cell groups (90.5%; p < 0.0001) and lower quality in terms of blastocyst cryotolerance (56.0 vs. 83.7%; p < 0.005). There were no detected effects relating to the age or handling of the monolayer on the embryo developmental rate, but the day of blastocyst appearance was different between embryos cultured on monolayers derived from fresh or frozen-thawed cells (p < 0.0001); the main influence was on the group of 9- to 12-cell embryos (p < 0.0001). Current results confirm the temporal sensitivities of sheep embryos to in vitro culture, regardless of the culture conditions.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2006

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