THE EFFECT OF VITRIFICATION DEVICE AND EMBRYONIC STAGE ON SURVIVAL AND DEVELOPMENTAL COMPETENCE OF GABALI RABBIT EMBRYOS | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 11, Volume 93, Issue 2, July 2015, Page 543-552 PDF (293.73 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2015.154793 | ||||
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| Authors | ||||
| HESHAM A. FARAG1; HAZEM S. MEHAWED1; OMELKHER M. GUERO2; AYMEN M. SAEED3 | ||||
| 1Agricultural Engineering Research Institute, Agricultural Research Center,Giza, Egypt. | ||||
| 2Centre for Geological and Mining Research, (Cell SIGMINES) Niamey, Niger | ||||
| 3Biotech. Dept., Anim. Prod. Res. Inst., ARC, Egypt. | ||||
| Abstract | ||||
| the current study aimed to evaluate the effect of vitrification device (straw or cryotop) and embryonic stage (4-8 cell or morula stages) on survivability, normality and in vitro embryo development rate into blastocysts/hatched blastocysts. Total of 24 mature rabbit does of Gabali breed (5-6 months of age, 3-3.5 kg live body weight) were used in this study as embryo donors. Rabbit does were superovulated by PMSG and hCG. Embryos at 4-8 cell stage were recovered by flushing oviducts 32–43h post-mating, while, embryos at morula stage were recovered by flushing oviducts 64-66 h post-mating. Embryos were vitrified by straw or cryotop. Survival and normality rates were determined. The vitrified embryos were in vitro cultured for 3-5 days to record blastocyst and hatching blastocyst formation rates. Results showed insignificant differences in survival and normality rates of vitrified embryos as affected by embryonic stage, although there were a tendency of higher rates yielded from embryos at morula than at 4-8 cell stage (87.7 and 89.2% vs. 85.9 and 85.2%, respectively). Survival and normality rates were higher (P<0.05) using cryotop than straw, being 92.1 and 93.1% using cryotop versus 81.7 and 81.0% using straw, respectively. Expansion and hatching rates were higher (P<0.05) for vitrified embryos at morula than at 4-8cell stage (80.0 and 71.5% vs. 66.0 and 54.0%, respectively) and using cryotop than straw (81.6 and 75.3 vs. 63.1 and 48.2%, respectively).The current study could be conclude that using the cryotop method to vitrify rabbit embryos rather than straw method at various developmental stages, particulary at morula stage. | ||||
| Keywords | ||||
| Rabbit embryo; vitrification; crypto; survival; blastocyst | ||||
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