NonSurgical Embryo Recovery from Estrus-Synchronized or Superovulated Morada Nova Ewes : A Feasible Strategy for Sheep Embryo Banking
This study assessed the feasibility of in vivo embryo production and nonsurgical embryo recovery (NSER) in Morada Nova ewes (an endangered native Brazilian breed of sheep) subjected to different estrus synchronization and/or superovulation protocols. Ewes received intravaginal sponges soaked with 60 mg medroxyprogesterone acetate (MAP), which were kept in place for six (G6; n = 12), nine (G9; n = 12), or 12 (G12; n = 12) days. Half of the ewes in each group remained estrus synchronized only (SYNCH) and the other half was superovulated (SOV) with 133 mg porcine follicle-stimulating hormone (pFSH). There were no differences (p > 0.05) in antral follicle counts determined with ultrasonography 60 hours before MAP sponge removal (or at the time of the first pFSH dose) among G6 (6.4 ± 0.9), G9 (6.2 ± 0.7), and G12 (5.5 ± 0.6). Estrus responses and NSER success rates did not vary (p > 0.05) among the three progestin-treatment groups of ewes for either estrus-induced or superovulated animals. The onset of estrus occurred 10-12 hours later (p < 0.01) in G9SYNCH ewes compared with G6SYNCH and G12SYNCH, and the duration of estrus was ∼19 hours greater (p < 0.01) in G9SOV than in G6SOV. The average duration of the NSER procedure was 32.6 ± 1.3 minutes. At least one structure was recovered in 85.7% of synchronized and in 87.5% of superovulated ewes. Viable embryo recovery rates were also similar (p > 0.05) for G6 (1.0 ± 0.3 and 2.5 ± 1.5), G9 (1.3 ± 0.5 and 4.8 ± 2.0), and G12 groups (1.0 ± 0.3 and 4.8 ± 2.3; estrus-synchronized and superovulated ewes, respectively). In conclusion, progestogen pretreatment of different durations and NSER can be employed in Morada Nova ewes, resulting in reasonable viable embryo recovery rates in both estrus-synchronized and superovulated animals. Therefore, both techniques are suitable for use in commercial settings as well as small ruminant conservation programs.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:19 |
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| Enthalten in: |
Biopreservation and biobanking - 19(2021), 5 vom: 16. Okt., Seite 360-368 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Arrais, Aline Matos [VerfasserIn] |
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| Links: |
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| Themen: |
9002-68-0 |
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| Anmerkungen: |
Date Completed 25.10.2021 Date Revised 25.10.2021 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1089/bio.2020.0125 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM323250165 |
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| 245 | 1 | 0 | |a NonSurgical Embryo Recovery from Estrus-Synchronized or Superovulated Morada Nova Ewes |b A Feasible Strategy for Sheep Embryo Banking |
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| 500 | |a Date Revised 25.10.2021 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a This study assessed the feasibility of in vivo embryo production and nonsurgical embryo recovery (NSER) in Morada Nova ewes (an endangered native Brazilian breed of sheep) subjected to different estrus synchronization and/or superovulation protocols. Ewes received intravaginal sponges soaked with 60 mg medroxyprogesterone acetate (MAP), which were kept in place for six (G6; n = 12), nine (G9; n = 12), or 12 (G12; n = 12) days. Half of the ewes in each group remained estrus synchronized only (SYNCH) and the other half was superovulated (SOV) with 133 mg porcine follicle-stimulating hormone (pFSH). There were no differences (p > 0.05) in antral follicle counts determined with ultrasonography 60 hours before MAP sponge removal (or at the time of the first pFSH dose) among G6 (6.4 ± 0.9), G9 (6.2 ± 0.7), and G12 (5.5 ± 0.6). Estrus responses and NSER success rates did not vary (p > 0.05) among the three progestin-treatment groups of ewes for either estrus-induced or superovulated animals. The onset of estrus occurred 10-12 hours later (p < 0.01) in G9SYNCH ewes compared with G6SYNCH and G12SYNCH, and the duration of estrus was ∼19 hours greater (p < 0.01) in G9SOV than in G6SOV. The average duration of the NSER procedure was 32.6 ± 1.3 minutes. At least one structure was recovered in 85.7% of synchronized and in 87.5% of superovulated ewes. Viable embryo recovery rates were also similar (p > 0.05) for G6 (1.0 ± 0.3 and 2.5 ± 1.5), G9 (1.3 ± 0.5 and 4.8 ± 2.0), and G12 groups (1.0 ± 0.3 and 4.8 ± 2.3; estrus-synchronized and superovulated ewes, respectively). In conclusion, progestogen pretreatment of different durations and NSER can be employed in Morada Nova ewes, resulting in reasonable viable embryo recovery rates in both estrus-synchronized and superovulated animals. Therefore, both techniques are suitable for use in commercial settings as well as small ruminant conservation programs | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a NSER | |
| 650 | 4 | |a in vivo embryo production | |
| 650 | 4 | |a naturalized breed | |
| 650 | 4 | |a ovine | |
| 650 | 4 | |a superovulation | |
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| 700 | 1 | |a Mello, Marco Roberto Bourg de |e verfasserin |4 aut | |
| 700 | 1 | |a Vergani, Gabriel Brun |e verfasserin |4 aut | |
| 700 | 1 | |a Figueira, Lucas Machado |e verfasserin |4 aut | |
| 700 | 1 | |a Esteves, Sérgio Novita |e verfasserin |4 aut | |
| 700 | 1 | |a Pereira, Verônica Schinaider do Amaral |e verfasserin |4 aut | |
| 700 | 1 | |a Bartlewski, Pawel Mieczyslaw |e verfasserin |4 aut | |
| 700 | 1 | |a Oliveira, Maria Emilia Franco |e verfasserin |4 aut | |
| 700 | 1 | |a Souza-Fabjan, Joanna Maria Gonçalves |e verfasserin |4 aut | |
| 700 | 1 | |a Fonseca, Jeferson Ferreira da |e verfasserin |4 aut | |
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