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In vivo embryo production and recovery in lacaune ewes after imposing a superovulation treatment regimen is related to pFSH dose.

Authors
  • Figueira, Lucas Machado1
  • Alves, Nadja Gomes2
  • Maia, Ana Lucia Rosa E Silva3
  • Souza-Fabjan, Joanna Maria Gonçalves3
  • Batista, Ribrio Ivan Tavares Pereira3
  • Arrais, Aline Matos4
  • Lima, Renato Ribeiro5
  • Oliveira, Maria Emilia Franco6
  • Fonseca, Jeferson Ferreira7
  • 1 Universidade Federal de Lavras, Av. Doutor Sylvio Menicucci, 1001, Kennedy, CEP 37200-900, Lavras, MG, Brazil; Universidade Federal Fluminense, Rua Vital Brazil Filho, 64, Vital Brazil, CEP 24230-340, Niterói, RJ, Brazil. , (Brazil)
  • 2 Universidade Federal de Lavras, Av. Doutor Sylvio Menicucci, 1001, Kennedy, CEP 37200-900, Lavras, MG, Brazil. Electronic address: [email protected] , (Brazil)
  • 3 Universidade Federal Fluminense, Rua Vital Brazil Filho, 64, Vital Brazil, CEP 24230-340, Niterói, RJ, Brazil. , (Brazil)
  • 4 Universidade Federal Rural do Rio de Janeiro, Rodovia BR 465, Km 07, s/n Zona Rural, CEP 23890-000, Seropédica, RJ, Brazil. , (Brazil)
  • 5 Universidade Federal de Lavras, Av. Doutor Sylvio Menicucci, 1001, Kennedy, CEP 37200-900, Lavras, MG, Brazil. , (Brazil)
  • 6 Universidade Estadual Paulista "Júlio de Mesquita Filho", Via de acesso Prof. Paulo Donato Castelane, s/n, Zona Rural, CEP 14884-900, Jaboticabal, SP, Brazil; Embrapa Caprinos e Ovinos, Estrada Sobral/Groaíras, km 4, CP D10, CEP 62011-000, Sobral, CE, Brazil. , (Brazil)
  • 7 Embrapa Caprinos e Ovinos, Estrada Sobral/Groaíras, km 4, CP D10, CEP 62011-000, Sobral, CE, Brazil. Electronic address: [email protected] , (Brazil)
Type
Published Article
Journal
Animal reproduction science
Publication Date
Dec 01, 2020
Volume
223
Pages
106625–106625
Identifiers
DOI: 10.1016/j.anireprosci.2020.106625
PMID: 33075735
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This study was conducted to assess effects of different doses of pFSH on follicular recruitment, superovulatory response, ova/embryo recovery, and embryo yield in lactating ewes. Ewes (n = 24) had a superovulation treatment regimen imposed. All ewes were implanted with a progesterone intravaginal device for 9 d, and administered either 100 (G-100) or 200 (G-200) mg pFSH, proportioned into six doses administered at 12-h intervals, starting 60 h before device removal. At 7 days subsequent to progesterone device removal, there were non-surgical embryo recoveries (NSER) from ewes having three or more corpora lutea. At the time of the first pFSH injection, number of antral follicles were similar (P < 0.05) between ewes in the G-100 and G-200 group, however, there were more 3.1-4.0 mm follicles in ewes of the G-200 than G-100 group at the time of the second pFSH administration. Estrous response and CL number were less (P < 0.05) in ewes of the G-100 (66.7 % and 2.6 ± 0.7) than G-200 (91.7 % and 11.6 ± 1.2) group. There were embryo collections from 100 % and 90.9 % of ewes in the G-100 and G-200 groups, respectively (P > 0.05). Viable embryo numbers and ova/embryo recovery rate were greater (P < 0.05) in ewes of the G-200 (6.9 ± 1.1 and 67.8 %) than G-100 (1.0 ± 0.5 and 27.6 %) group. A dose of 200 mg pFSH was more effective in inducing a superovulatory response and embryo yield after NSER in ewes, however, the 100 mg dose was insufficient for these purposes. Copyright © 2020 Elsevier B.V. All rights reserved.

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