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Teng M, Zhao M, Mu B, Lei A. Allogenic Follicular Fosterage Technology: Problems, Progress and Potential. Vet Sci 2024; 11:276. [PMID: 38922023 PMCID: PMC11209517 DOI: 10.3390/vetsci11060276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 06/13/2024] [Accepted: 06/14/2024] [Indexed: 06/27/2024] Open
Abstract
The allogeneic follicular fosterage (AFF) technique transfers cumulus-oocyte complexes (COCs) from pubertal female animals to the dominant follicles of adult female animals for further development, allowing the COCs to further develop in a completely in vivo environment. This article reviews the history of AFF and JIVET and their effects on oocyte and embryo development as well as freezing resistance. Improving the efficiency and reproducibility of AFF technology is crucial to its clinical application. This article discusses factors that affect the success rate of AFF, including differences in specific technical procedures and differences between pubertal and adult follicles. Designing standardized procedures and details to improve the synchronization of donor COCs and recipient follicle maturity and reducing the damage to COCs caused by follicular aspiration may be the direction for improving the success rate of AFF in the future.
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Affiliation(s)
- Mingming Teng
- Guizhou Academy of Testing and Analysis, Guiyang 550013, China
| | - Mengqi Zhao
- Shaanxi Stem Cell Engineering and Technology Research Center, College of Veterinary Medicine, Northwest A&F University, Yangling 712100, China
| | - Bo Mu
- Guizhou Academy of Testing and Analysis, Guiyang 550013, China
| | - Anmin Lei
- Shaanxi Stem Cell Engineering and Technology Research Center, College of Veterinary Medicine, Northwest A&F University, Yangling 712100, China
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Temerario L, Monaco D, Mastrorocco A, Martino NA, Cseh S, Lacalandra GM, Ciani E, Dell'Aquila ME. New Strategies for Conservation of Gentile di Puglia Sheep Breed, an Autochthonous Capital of Millennial Tradition in Southern Italy. Animals (Basel) 2023; 13:2371. [PMID: 37508148 PMCID: PMC10376504 DOI: 10.3390/ani13142371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/18/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
Gentile di Puglia (GdP) is an autochthonous sheep breed of Southern Italy included among ovine breeds threatened by genetic erosion and extinction risk, which have been given attention by local and international institutions, thus emphasizing the need for germplasm conservation actions. In the present study, two assisted reproduction approaches, finalized for GdP conservation, were performed: (1) on-farm reproductive efficiency evaluation, expressed as pregnancy rate (PR), twin pregnancy rate (tPR), and body condition score (BCS), for three consecutive breeding cycles and (2) pre-pubertal lambs' immature cumulus-oocyte complex (COC) retrieval, vitrification, in vitro maturation (IVM), and assessment of meiotic stage and bioenergetic-oxidative status compared with those of other Italian and European commercial breeds. PR and tPR were progressively reduced over time. In all clinical examination times, BCS was significantly lower in nonpregnant ewes compared with pregnant ones. Fresh GdP pre-pubertal lamb COCs achieved meiotic maturation and showed healthy bioenergetic-oxidative status after IVM. Vitrification reduced the oocyte maturation rate in all groups. However, mature oocytes retained their cytoplasmic maturity, expressed as a mitochondria distribution pattern and activity, indicating promising developmental competence. In conclusion, clinical- and biotechnological-assisted reproduction approaches can support conservation strategies of GdP and other local sheep breeds in Southern Italy.
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Affiliation(s)
- Letizia Temerario
- Department of Biosciences, Biotechnologies & Environment, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
| | - Davide Monaco
- Department of Veterinary Medicine, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
| | - Antonella Mastrorocco
- Department of Biosciences, Biotechnologies & Environment, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
| | - Nicola Antonio Martino
- Department of Biosciences, Biotechnologies & Environment, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
| | - Sándor Cseh
- Department of Obstetrics and Food Animal Medicine Clinic, University of Veterinary Medicine, István St. 2, 1078 Budapest, Hungary
| | - Giovanni Michele Lacalandra
- Department of Veterinary Medicine, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
| | - Elena Ciani
- Department of Biosciences, Biotechnologies & Environment, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
| | - Maria Elena Dell'Aquila
- Department of Biosciences, Biotechnologies & Environment, University of Bari Aldo Moro, Strada per Casamassima km 3, Valenzano, 70010 Bari, Italy
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Pitchayapipatkul J, Somfai T, Matoba S, Parnpai R, Nagai T, Geshi M, Vongpralub T. Microtubule stabilisers docetaxel and paclitaxel reduce spindle damage and maintain the developmental competence of in vitro-mature bovine oocytes during vitrification. Reprod Fertil Dev 2018; 29:2028-2039. [PMID: 28147214 DOI: 10.1071/rd16193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Accepted: 12/10/2016] [Indexed: 11/23/2022] Open
Abstract
This study compared the efficacy of docetaxel (DT) and paclitaxel (PT) in reducing spindle damage during vitrification and maintaining the developmental competence of in vitro-matured (IVM) bovine oocytes after vitrification and warming. Pretreatment of IVM oocytes with 0.05µM DT for 30min before vitrification resulted in significantly higher (P<0.05) rates of oocyte survival and cleavage after IVF, as well as subsequent blastocyst rates on Days 7-9 and hatching on Days 8-9, compared with oocytes pretreated with 1.0µM PT before vitrification or those vitrified without pretreatment. When nuclear status and spindle morphology of vitrified oocytes were assess after warming by immunostaining, DT pretreatment before vitrification resulted in a significantly higher (P<0.05) percentage of oocytes at the MII stage with a normal, intact spindle compared with PT pretreatment or no pretreatment, but the percentage of MII oocytes was still significantly lower (P<0.05) than in the control group. Pretreatment of IVM bovine oocytes with 0.05µM DT or 1.0µM PT for 30min before vitrification reduces spindle damage to the same extent, without side effects on fertilisation and development. Pretreatment with 0.05µM DT improved the developmental competence of vitrified-warmed oocytes to a greater degree than 1.0µM PT pretreatment.
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Affiliation(s)
| | - Tamás Somfai
- Animal Breeding and Reproduction Research Division, National Agriculture and Food Research Organisation (NARO) Institute of Livestock and Grassland Science, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan
| | - Satoko Matoba
- Animal Breeding and Reproduction Research Division, National Agriculture and Food Research Organisation (NARO) Institute of Livestock and Grassland Science, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan
| | - Rangsan Parnpai
- Embryo Technology and Stem Cell Research Center, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
| | - Takashi Nagai
- Food and Fertilizer Technology Center, Taipei 10648, Taiwan
| | - Masaya Geshi
- Animal Breeding and Reproduction Research Division, National Agriculture and Food Research Organisation (NARO) Institute of Livestock and Grassland Science, 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan
| | - Thevin Vongpralub
- Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
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Sanaei B, Movaghar B, Rezazadeh Valojerdi M, Ebrahimi B, Bazrgar M, Hajian M, Nasr-Esfahani MH. Developmental competence of in vitro matured ovine oocytes vitrified in solutions with different concentrations of trehalose. Reprod Domest Anim 2018; 53:1159-1167. [PMID: 29938846 DOI: 10.1111/rda.13221] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 04/27/2018] [Accepted: 05/01/2018] [Indexed: 01/30/2023]
Abstract
This study aimed to determine the optimum concentration of trehalose in solutions used for vitrification of in vitro matured (IVM) ovine oocytes. IVM oocytes were randomly divided into four experimental (vitrified) and one control (fresh) groups. Experimental groups were treated with different concentrations (0.0, 0.25, 0.5 and 1.0 M) of trehalose. After warming, some viable oocytes were exposed to 0.25% pronase to test zona pellucida hardening, whereas the others were fertilized and cultured in vitro for 8 days to evaluate their developmental competence. Blastocysts quality was assessed by differential staining and TUNEL test. Survival and developmental rates of oocytes vitrified in the presence of 0.5 M trehalose were significantly higher than those of the other vitrified groups. Furthermore, there was a significant difference between fresh and vitrified groups in total blastocyst rate. Analysis of blastocysts quality also revealed a significant difference between the group treated with 0.5 M trehalose and other groups in terms of apoptotic index. Furthermore,zona pellucida digestion time period was longer in trehalose-free (0.0 M) group compared to other groups. In conclusion, we found that IVM ovine oocytes vitrified in solutions containing 0.5 M trehalose are fertilization-competent and are able to produce good-quality blastocysts with an apoptotic index comparable to that of the fresh oocytes. Therefore, 0.5 M may be considered the optimum concentration of trehalose to be used in solutions prepared for vitrification of oocytes.
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Affiliation(s)
- Batool Sanaei
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Bahar Movaghar
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | | | - Bita Ebrahimi
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Masood Bazrgar
- Department of Genetics, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Mehdi Hajian
- Department of Reproductive Biotechnology, Reproductive Biomedicine Research Center, Royan Institute for Biotechnology, ACECR, Tehran, Iran
| | - Mohammad H Nasr-Esfahani
- Department of Reproductive Biotechnology, Reproductive Biomedicine Research Center, Royan Institute for Biotechnology, ACECR, Tehran, Iran
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Quan G, Wu G, Hong Q. Oocyte Cryopreservation Based in Sheep: The Current Status and Future Perspective. Biopreserv Biobank 2017; 15:535-547. [DOI: 10.1089/bio.2017.0074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Guobo Quan
- Department of Herbivore Science, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan Province, China
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Guoquan Wu
- Department of Herbivore Science, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan Province, China
| | - Qionghua Hong
- Department of Herbivore Science, Yunnan Animal Science and Veterinary Institute, Kunming, Yunnan Province, China
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KUMARI DIMPLE, KUMAR DHARMENDRA, RAHANGDALE SANDEEP, JEENA LALITMOHAN, SINGH AJITPRATAP, SARKHEL BIKASHCHANDRA. Developmental competence of goat oocytes vitrified at immature and mature stage in comparsion to fresh oocytes after in vitro fertilization using cauda epididymal spermatozoa. THE INDIAN JOURNAL OF ANIMAL SCIENCES 2017. [DOI: 10.56093/ijans.v87i11.75878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
The oocytes were cryopreserved at 2 developmental check points, viz. immature and metaphase II stage, and the outcome of in vitro fertilization (IVF) was assessed as compared to fresh oocytes. The oocytes were cryopreserved by solid surface vitrification technique using equilibration media (4% ethylene glycol) followed by vitrification media (0.5 M sucrose + 35% ethylene glycol + 0.5% polyvinyl pyrollidone). The mature oocytes were pre-treatedwith cytochalasin B for 30 min before vitrification. The vitrified-thawed oocytes of both groups as well fresh oocytes were fertilized with buck epididymal sperm. The results revealed a significantly higher rate of embryonic development in vitrified-thawed immature oocytes as compared to that in vitrified-thawed mature oocytes at all the embryonic stages. The embryonic developmental rate under fresh oocyte group was significantly higher than both vitrified groups. Results indicated that the immature goat oocytes could be a better candidate for long term storage of female germplasm as well as dissemination into distant places.
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Cholesterol added prior to vitrification on the cryotolerance of immature and in vitro matured bovine oocytes. PLoS One 2017; 12:e0184714. [PMID: 28910399 PMCID: PMC5598999 DOI: 10.1371/journal.pone.0184714] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 08/29/2017] [Indexed: 12/05/2022] Open
Abstract
This study examines whether incorporating cholesterol-loaded methyl-β-cyclodextrin (CLC) in the bovine oocyte plasma membrane improves oocyte tolerance to vitrification. In vitro matured oocytes were incubated with 2 mg/ml BODIPY-labeled CLC for different time intervals in FCS or PVA supplemented medium or exposed to different CLC concentrations to examine the subcellular localization of cholesterol by confocal microscopy live-cell imaging. Subsequently, the effects of optimized CLC concentrations and incubation times prior to vitrification on early embryo development were assessed. Then, we evaluated the effects of pretreatment with 2 mg/ml CLC for 30 min before the vitrification of immature (GV) and in vitro matured (MII) oocytes on developmental competence and gene expression. Our results indicate a high plasma membrane labeling intensity after 30 min of incubation with 2 mg/ml CLC for 30 min, regardless of the holding medium used. When oocytes were incubated with 1 mg/ml, 2 mg/ml and 3 mg/ml of CLC, intense labeling was observed at the plasma membrane after 40, 30 and 20 min, respectively. CLC pre-treatment before the vitrification of bovine oocytes did not affect subsequent cleavage and embryo development rates irrespective of CLC concentrations, incubation times or meiotic stage. However, pretreatment seems to improve the quality of embryos derived from vitrified oocytes, mainly when oocytes were vitrified at the GV stage.
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Sprícigo JFW, Sena Netto SB, Muterlle CV, Rodrigues SDAD, Leme LO, Guimarães AL, Caixeta FMC, Franco MM, Pivato I, Dode MAN. Intrafollicular transfer of fresh and vitrified immature bovine oocytes. Theriogenology 2016; 86:2054-62. [PMID: 27523724 DOI: 10.1016/j.theriogenology.2016.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 07/01/2016] [Accepted: 07/02/2016] [Indexed: 10/21/2022]
Abstract
Embryo production by intrafollicular oocyte transfer (IFOT) represents an alternative for production of a large number of embryos without requiring any hormones and only basic laboratory handling. We aimed to (1) evaluate the efficiency of IFOT using immature oocytes (IFIOT) and (2) compare embryo development after IFIOT using fresh or vitrified immature oocytes. First, six IFIOTs were performed using immature oocytes obtained by ovum pickup. After insemination and uterine flush for embryo recovery, 21.3% of total transferred structures were recovered excluding the recipient's own oocyte or embryo, and of those, 26% (5.5% of transferred cumulus-oocyte complexes [COCs]) were morula or blastocyst. In the second study, we compared fresh and vitrified-warmed immature COCs. Four groups were used: (1) fresh immature COCs (Fresh-Vitro); (2) vitrified immature COCs (Vit-Vitro), with both groups 1 and 2 being matured, fertilized, and cultured in vitro; (3) fresh immature COCs submitted to IFIOT (Fresh-IFIOT); and (4) vitrified immature COCs submitted to IFIOT (Vit-IFIOT). Cumulus-oocyte complexes (n = 25) from Fresh-IFIOT or Vit-IFIOT groups were injected into dominant follicles (>10 mm) of synchronized heifers. After excluding one structure or blastocyst, the recovery rates per transferred oocyte were higher (P < 0.05) for Fresh-IFIOT (47.6%) than for Vit-IFIOT (12.0%). Blastocyst yield per initial oocyte was higher (P < 0.05) for Fresh-Vitro (42.1%) than for Fresh-IFIOT (12.9%). Vit-Vitro presented higher (P < 0.05) embryo development (6.3%), compared to Vit-IFIOT, which did not result in any extra embryo. Although IFOT did not improve developmental competence of vitrified oocytes, we achieved viable blastocysts and pregnancies produced after IFIOT of fresh bovine immature oocytes. Further work on this technique is warranted as an option both for research studies and for clinical bovine embryo production in the absence of laboratory facilities for IVF.
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Affiliation(s)
- José Felipe W Sprícigo
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | | | | | | | - Ligiane Oliveira Leme
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Ana Luiza Guimarães
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | | | - Maurício Machain Franco
- Embrapa Genetic Resources and Biotechnology, Laboratory of Animal Reproduction, Brasília-DF, Brazil
| | - Ivo Pivato
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Margot Alves Nunes Dode
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil; Embrapa Genetic Resources and Biotechnology, Laboratory of Animal Reproduction, Brasília-DF, Brazil.
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Sprícigo JFW, Diógenes MN, Leme LO, Guimarães AL, Muterlle CV, Silva BDM, Solà-Oriol D, Pivato I, Silva LP, Dode MAN. Effects of Different Maturation Systems on Bovine Oocyte Quality, Plasma Membrane Phospholipid Composition and Resistance to Vitrification and Warming. PLoS One 2015; 10:e0130164. [PMID: 26107169 PMCID: PMC4480852 DOI: 10.1371/journal.pone.0130164] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 05/18/2015] [Indexed: 11/19/2022] Open
Abstract
The objective of this study was to evaluate the effects of different maturation systems on oocyte resistance after vitrification and on the phospholipid profile of the oocyte plasma membrane (PM). Four different maturation systems were tested: 1) in vitro maturation using immature oocytes aspirated from slaughterhouse ovaries (CONT; n = 136); 2) in vitro maturation using immature oocytes obtained by ovum pick-up (OPU) from unstimulated heifers (IMA; n = 433); 3) in vitro maturation using immature oocytes obtained by OPU from stimulated heifers (FSH; n = 444); and 4) in vivo maturation using oocytes obtained from heifers stimulated 24 hours prior by an injection of GnRH (MII; n = 658). A sample of matured oocytes from each fresh group was analyzed by matrix associated laser desorption-ionization (MALDI-TOF) to determine their PM composition. Then, half of the matured oocytes from each group were vitrified/warmed (CONT VIT, IMA VIT, FSH VIT and MII VIT), while the other half were used as fresh controls. Afterwards, the eight groups underwent IVF and IVC, and blastocyst development was assessed at D2, D7 and D8. A chi-square test was used to compare embryo development between the groups. Corresponding phospholipid ion intensity was expressed in arbitrary units, and following principal components analyses (PCA) the data were distributed on a 3D graph. Oocytes obtained from superstimulated animals showed a greater rate of developmental (P<0.05) at D7 (MII = 62.4±17.5% and FSH = 58.8±16.1%) compared to those obtained from unstimulated animals (CONT = 37.9±8.5% and IMA = 50.6±14.4%). However, the maturation system did not affect the resistance of oocytes to vitrification because the blastocyst rate at D7 was similar (P>0.05) for all groups (CONT VIT = 2.8±3.5%, IMA VIT = 2.9±4.0%, FSH VIT = 4.3±7.2% and MII VIT = 3.6±7.2%). MALDI-TOF revealed that oocytes from all maturation groups had similar phospholipid contents, except for 760.6 ([PC (34:1) + H]+), which was more highly expressed in MII compared to FSH (P<0.05). The results suggest that although maturation systems improve embryonic development, they do not change the PM composition nor the resistance of bovine oocytes to vitrification.
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Affiliation(s)
- José F. W. Sprícigo
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Mateus N. Diógenes
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Ligiane O. Leme
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Ana L. Guimarães
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Carolle V. Muterlle
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | | | - David Solà-Oriol
- Servei de Nutrició i Benestar Animal (SNiBA), Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain
| | - Ivo Pivato
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
| | - Luciano Paulino Silva
- Embrapa Genetic Resources and Biotechnology, Laboratory of Animal Reproduction, Brasília- DF, Brazil
| | - Margot A. N. Dode
- School of Agriculture and Veterinary Medicine, University of Brasilia, Brasília-DF, Brazil
- Embrapa Genetic Resources and Biotechnology, Laboratory of Animal Reproduction, Brasília- DF, Brazil
- * E-mail:
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Hirao Y, Somfai T, Naruse K. In vitro growth and maturation of vitrified-warmed bovine oocytes collected from early antral follicles. J Reprod Dev 2014; 60:68-72. [PMID: 24126072 PMCID: PMC3963295 DOI: 10.1262/jrd.2013-089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cryopreservation of growing oocytes enriches the choice of timing and location of
artificial embryo production. However, completion of oocyte growth after warming is
crucial when using such cryopreserved oocytes. Our research objective was to develop a
sequential system that incorporates cryopreservation of growing bovine oocytes and their
subsequent in vitro growth. Oocyte-granulosa cell complexes with a mean
oocyte diameter of approximately 100 µm were vitrified-warmed and then cultured for 14
days. The percentage of surviving oocytes following cryopreservation and 14-day culture
was approximately 80%. More than half of the surviving oocytes were capable of maturing to
metaphase II after in vitro maturation; the rate was comparable to that
of control oocytes grown in vitro without cryopreservation. Taken
together, the combined protocols for vitrification-warming of growing oocytes and
subsequent in vitro growth can produce oocytes capable of undergoing
meiotic maturation.
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Affiliation(s)
- Yuji Hirao
- NARO Institute of Livestock and Grassland Science, Ibaraki 305-0901, Japan
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Dutta DJ, Dev H, Raj H. In vitro blastocyst development of post-thaw vitrified bovine oocytes. Vet World 2013. [DOI: 10.14202/vetworld.2013.730-733] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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