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• W2002116819 abstract "We summarize here the procedures for nuclear transfer using S-phase cytoplasts and describe a new method for avoiding loss of reconstructed embryos from the oviducts during in vivo culture. We obtained 2 clones of 5 genetically identical animals following the transfer of blastomeres from 16-cell embryos into enucleated preactivated cytoplasts. Metaphase II oocytes and embryos were surgically collected from superovulated Sarda breed ewes 54 and 120 h after sponge removal, respectively. Oocytes were exposed for 15 min to 5 mug/ml of Hoechst 33342 and were micromanipulated at room temperature. Efficiency in embryo reconstruction was 100% for enucleation and 98% for fusion. Embryos were embedded in agar as separate clones and transferred into the oviducts of temporary recipients. The fimbriae were closed with glass-nylon made filters. Embryo recovery from the temporary recipients was 97.3%, with a cleavage rate of 81.4%; development to morula-blastocyst stage was 70.6%. A total of 29 Grade 1 blastocysts corresponding to 5 clones were transferred into 13 naturally synchronous ewes, and scanning was performed at 30 and 90 d. Ten ewes were pregnant at the first scanning and nine at the second for a final pregnancy rate of 71.4%; the survival rate at term was 48%. Overall, we obtained 4 clones of identical lambs: two sets of 5 (one male set and one female set) and two sets of twins (both sets male). Pregnancy length in recipients carrying clones was longer than the standard period in Sarda breed (153 vs 150 d, respectively). Weight at birth was higher for male lambs obtained from nuclear transfer than for normal males (4.1 vs 3.6 kg), while the weight for females was normal." @default.
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• W2002116819 date "1997-07-01" @default.
• W2002116819 modified "2023-09-27" @default.
• W2002116819 title "Embryo cloning in sheep: Work in progress" @default.
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• W2002116819 doi "https://doi.org/10.1016/s0093-691x(97)00187-8" @default.
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