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Effect of eCG in a short-term synchronization treatment on ovarian status, estrus synchrony, and ovulation in dairy goats managed under tropical conditions

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Abstract

The aim of this study was to assess the need of using eCG on short-term estrus synchronization protocol in nulliparous (NUL) and multiparous (MULT) dairy goats during the breeding season. Alpine (n = 20), Nubian (n = 20), and Saanen (n = 16) goats received 60 mg medroxyprogesterone acetate intravaginal sponges for 6 days plus 30 μg d-cloprostenol and 200 IU eCG (G-eCG, n = 28) or saline (G-Control, n = 28) 24 h before sponge removal. The NUL and MULT goats of each breed were equally assigned into the two treatments. Transrectal ultrasonography was used to evaluate ovulatory parameters, and teaser goats were used for estrus detection every 12 h from sponge removal to ovulation. eCG did not affect (P > 0.05) estrus response (~86%), diameter of ovulatory follicles (~6.8 mm), and number of ovulations (~1.6). Nevertheless, eCG led to earlier (P < 0.05) ovulation (G-eCG = 65.1 and G-Control = 73.2 h) and increased (P < 0.05) the ovulation rate (G-eCG = 96.4% and G-Control = 67.9%). In the absence of eCG, no differences regarding reproductive parameters (P > 0.05) were found between parity orders. Alpine MULT goats underwent a superior (P < 0.05) number of ovulations (2.2) in comparison to NUL goats (1.3). In conclusion, the exclusion of eCG from short-term estrus synchronization protocol did not interfere with estrus response but decreased the ovulation rate.

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Data availability

The data supporting the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank the dairy goat farms, Capril Sanri and Capritec, for their animals and management support for this research. MEFO, JMGS-F, and JFF are CNPq fellows, and JMGS-F is also a FAPERJ fellow. The authors thank Bruna Rios Coelho Alves for the help with English language editing.

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Funding

This study was supported by EMBRAPA (Project 20.19.01.004.00.03.001) and CNPq (314952/2018-7).

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Authors and Affiliations

  1. Faculdade de Veterinária, Universidade Federal Fluminense, Rua Vital Brazil, 64, CEP, Niterói, RJ, 24320-340, Brazil

    Amanda Bricio Pereira de Andrade, Maria Clara Cruz Morais & Joanna Maria Gonçalves Souza-Fabjan

  2. Universidade do Grande Rio, Rua Professor José de Souza Herdy, 1160, CEP, Duque de Caxias, 25071-202, Brazil

    Paulo Sergio Cerqueira Rangel

  3. Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Via de Acesso Prof. Dr. Paulo Donato Castellane, s/n, CEP, Jaboticabal, SP, 14884-900, Brazil

    Maria Emilia Franco Oliveira

  4. Embrapa Caprinos e Ovinos, Estrada Sobral/Groaíras, km 04, CP 145, CEP, Sobral, CE, 62010-970, Brazil

    Jeferson Ferreira Fonseca

Authors
  1. Amanda Bricio Pereira de Andrade
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  2. Maria Clara Cruz Morais
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  3. Paulo Sergio Cerqueira Rangel
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  4. Maria Emilia Franco Oliveira
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  5. Joanna Maria Gonçalves Souza-Fabjan
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  6. Jeferson Ferreira Fonseca
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Corresponding author

Correspondence to Jeferson Ferreira Fonseca.

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This study was approved by the Ethics Committee on Animal Use of Universidade Federal Fluminense (protocol #6405230719), and thus, it was conducted in line with all ethical standards required.

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de Andrade, A.B.P., Morais, M.C.C., Rangel, P.S.C. et al. Effect of eCG in a short-term synchronization treatment on ovarian status, estrus synchrony, and ovulation in dairy goats managed under tropical conditions. Trop Anim Health Prod 53, 246 (2021). https://doi.org/10.1007/s11250-021-02699-y

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