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Nicolás ACCV, Dode MAN. Current status of the intrafollicular transfer of immature oocytes (IFIOT) in cattle: A review. Anim Reprod Sci 2024; 267:107523. [PMID: 38879973 DOI: 10.1016/j.anireprosci.2024.107523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 05/23/2024] [Accepted: 06/05/2024] [Indexed: 06/18/2024]
Abstract
Intrafollicular Transfer of Immature Oocytes (IFIOT) has emerged as an alternative to the currently used systems for bovine embryo production. This technique associates the rapid multiplication of bovine females under a completely in vivo culture condition, eliminating the need for superstimulatory hormones in the in vivo system (IVD) and the costly laboratory setup required for in vitro embryo production (IVP). Despite being a promising technique, the results obtained to date have been unsatisfactory for commercial use. Only approximately 10 % -12 % of viable embryos are recovered from the total number of injected oocytes, which limits their use in genetic improvement programs. IFIOT problems can occur in any of the steps involved; therefore, each step must be carefully examined to identify those that have the most negative impact on the final embryo recovery. This review summarizes the different studies conducted using the IFIOT to provide a comprehensive analysis of the main factors that can influence the effectiveness of this technique.
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Affiliation(s)
| | - Margot Alves Nunes Dode
- Embrapa - Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica, Asa Norte, Brasília, DF 70770-917, Brazil.
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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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Falchi L, Pivato I, Ledda M, Melosu V, Scanu A, Pau S, Ledda S, Zedda MT. Intrafollicular oocyte transfer (IFOT): Potential feasibility in the ovine species. Theriogenology 2021; 179:7-13. [PMID: 34823061 DOI: 10.1016/j.theriogenology.2021.11.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 10/29/2021] [Accepted: 11/15/2021] [Indexed: 11/19/2022]
Abstract
Intra-follicular oocyte transfer (IFOT) is a promising and innovative technique for in vivo embryo production previously described for equines and bovines. The aim of this study was to assess the feasibility of IFOT in the ovine species. Two preliminary in vivo and in vitro trials were performed to test the optimal procedures and timing for IFOT. In the in vivo trial, follicular growth was monitored with transrectal ultrasonography in ten adult ewes to preliminarily determine the ovulation and ideal timing for IFOT. The in vitro trial assessed i) the optimal inner diameter of the injection needle and ii) the recovery rate and integrity of injected cumulus-oocyte complexes (COCs) after follicle aspiration. For IFOT and embryo collection, five ewes were synchronized by CIDR insertion. Forty hours after CIDR removal, in ewes under sedation and general anesthesia, the ovaries were exposed by laparotomy, and the preovulatory follicle was injected with COCs previously collected from ovaries obtained from an abattoir. At 4 h after surgery, fully recovered ewes were housed in a paddock with a ram of proven fertility. Crayon marking on ram's chest was used to detect mating. Ovulation was assessed 40 h after the transfer of oocytes by transrectal ultrasonography. On day 6 after IFOT, embryo collection was performed by uterine flushing. In the in vitro testing, injection of >5 mm follicles with a 28 G needle loaded with 30 COCs in a 5 μL volume resulted in higher recovery rates and better preservation of COCs integrity. In the in vivo trial, ultrasound scanning revealed that ovulation occurred between 60 and 72 h after CIDR removal in all animals. In one ewe subjected to IFOT, 22/24 oocytes were effectively injected into the preovulatory follicle, but no embryos were collected after flushing. In the remaining four animals, 85/102 oocytes were injected, and six cleaved embryos, 12 morulae and 1 blastocyst were collected, including native embryos. This preliminary investigation indicated that IFOT in ovine species resulted in ovulation, fimbrial capture, tubal transport of heterologous oocytes and in vivo embryo production. Further studies are needed to optimize the embryo recovery rate and develop less invasive techniques for oocyte injection and uterine flushing, such as through a laparoscopic or transcervical approach.
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Affiliation(s)
- Laura Falchi
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy.
| | - Ivo Pivato
- Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, Campus Universitário Darcy Ribeiro, ICC - Asa Norte, Brasília, DF, 70910-900, Brazil
| | - Mauro Ledda
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy
| | - Valentino Melosu
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy
| | - Antonio Scanu
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy
| | - Salvatore Pau
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy
| | - Sergio Ledda
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy
| | - Maria Teresa Zedda
- Università degli Studi di Sassari, Dipartimento di Medicina Veterinaria, via Vienna n.2, Sassari, 07100, Italy
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