High Pregnancy and Calving Rates with a Limited Number of Transferred Handmade Cloned Bovine Embryos
| Autor: | Gleni Segura Portocarrero, Nilton Luis Murga Valderrama, Jenin Victor Cortez, Gábor Vajta, Jorge Maicelo Quintana |
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| Rok vydání: | 2018 |
| Předmět: |
Nuclear Transfer Techniques
Offspring Cloning Organism Ice calving Biology Andrology 03 medical and health sciences 0302 clinical medicine Pregnancy medicine Animals Vitrification Bovine embryo Cloning 030219 obstetrics & reproductive medicine 0402 animal and dairy science Embryo 04 agricultural and veterinary sciences Cell Biology Embryo Transfer medicine.disease 040201 dairy & animal science In Vitro Oocyte Maturation Techniques embryonic structures Somatic cell nuclear transfer Cattle Female Developmental Biology Biotechnology |
| Zdroj: | Cellular Reprogramming. 20:4-8 |
| ISSN: | 2152-4998 2152-4971 |
| DOI: | 10.1089/cell.2017.0024 |
| Popis: | A major obstacle of widespread commercial application of bovine somatic cell nuclear transfer is the low overall efficiency, that is, healthy calf-late pregnancy per transferred embryo rate. In this study, we report a series of experiments with a limited number of embryos created with handmade cloning (HMC) and transferred without or after open pulled straw vitrification. Embryo reconstruction was performed by using in vitro matured oocytes and adult ear skin fibroblasts. In two experiments, a total of 53 D7 blastocysts were developed from 188 reconstructed embryos. Fresh transfer of seven blastocysts into six recipients has resulted in three early pregnancies, two of them developed over 90 days and eventually resulted in healthy calves (33% offspring/transfer rate). In another two experiments, a total of 11 D7 blastocysts were obtained from 36 reconstructed embryos. Out of these, eight have reexpanded 18 hours after vitrification and warming. Transfer of these blastocysts into eight recipients has resulted in four early pregnancies and two live births; 25% offspring/transfer rate. These results indicate that low overall efficiency may not be an intrinsic feature of cattle cloning, and selection of the right procedures may help to overcome the actual limitations. |
| Databáze: | OpenAIRE |
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