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The reused progesterone device has the same effect on short or long estrus synchronization protocols in tropical sheep

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Abstract

This study aimed to evaluate the effect of progesterone (P4) device reutilization in long and short protocols for transcervical timed artificial insemination (TAI) in Santa Inês ewes. A total of 275 multiparous lactating ewes were blocked according to body weight (BW, 49.1 ± 7.3 means ± SE), body condition score (BCS, 2.9 ± 0.4; scale of 1–5), and days postpartum (50 ± 8.2 days), and allocated to one of the treatments. The treatments were arranged in a factorial design, in which the factor 1 was the P4 device type (new or a device of 0.3 g of P4 previously used by 11 days), and the factor 2 was the short or long TAI protocol (P4 device remained by 7 or 11 days, respectively). At device removal, all ewes received 300 IU eCG and 6.70 mg of Dinoprost tromethamine. After TAI protocol, ewes remained with ram by 21 days. There was no interaction between factors in any variables. Ewes that received a new P4 device delayed (P = 0.05) to show estrus compared with ewes receiving a previously used P4 device, but it did not affect pregnancy rate. The long protocol tended to increase pregnancy rate compared with short protocol (33% vs. 24%, respectively; P = 0.07). However, the pregnancy rate at the end of reproductive period was similar in both groups (about 84%). Thus, the use of long protocols tended to improve reproductive performance, and the reused P4 device did not affect pregnancy rate.

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Funding

This project received financial support from the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

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Author notes

  1. Alexandre Vaz Pires

    Present address: Animal Science Department, University of Sao Paulo – ESALQ, Pádua Dias, Piracicaba, SP, Brazil

Authors and Affiliations

  1. Departamento de Zootecnia, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP, 13418-900, Brazil

    Marcos Vinicius Biehl, Ivanete Susin, Evandro Maia Ferreira, Daniel Montanher Polizel & Alexandre Vaz Pires

  2. Departamento de Zootecnia, Instituto de Ciências Sociais, Educação e Zootecnia, Universidade Federal do Amazonas, Parintins, AM, 69152-240, Brazil

    Marcos Vinicius Castro de Ferraz Junior

  3. Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, 13635-000, Brazil

    José Paulo Roman Barroso & Alexandre Vaz Pires

Authors
  1. Marcos Vinicius Biehl
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  2. Marcos Vinicius Castro de Ferraz Junior
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  3. José Paulo Roman Barroso
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  4. Ivanete Susin
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  5. Evandro Maia Ferreira
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  6. Daniel Montanher Polizel
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  7. Alexandre Vaz Pires
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Corresponding author

Correspondence to Alexandre Vaz Pires.

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All procedures used in this study followed the Animal Care and Use Committee’s guidelines (# 98-0603) from the institution.

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The authors declare that they have no conflict of interest.

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The Animal Care and Use Committee from the University of São Paulo approved all procedures with animals.

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Biehl, M.V., de Ferraz Junior, M.V.C., Barroso, J.P.R. et al. The reused progesterone device has the same effect on short or long estrus synchronization protocols in tropical sheep. Trop Anim Health Prod 51, 1545–1549 (2019). https://doi.org/10.1007/s11250-019-01841-1

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