Luteal tissue characteristics of Morada Nova ewes with hCG application 7.5 days after the end of estrus synchronization protocol in the breeding season.

Autor: Gonçalves JD; Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900 Jaboticabal, SP, Brazil. Electronic address: joedson.goncalves@unesp.br., Vergani GB; Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900 Jaboticabal, SP, Brazil., Rodrigues JND; Department of Veterinary Medicine, Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, CEP 36570-000 Viçosa, MG, Brazil., Dias JH; Department of Veterinary Medicine, Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, CEP 36570-000 Viçosa, MG, Brazil., Pereira VSDA; Embrapa Southeast Livestock, Rod. Washington Luiz, km 234, CEP 13560-970 São Carlos, SP, Brazil., Garcia AR; Embrapa Southeast Livestock, Rod. Washington Luiz, km 234, CEP 13560-970 São Carlos, SP, Brazil., Esteves SN; Embrapa Southeast Livestock, Rod. Washington Luiz, km 234, CEP 13560-970 São Carlos, SP, Brazil., Fonseca JFD; Embrapa Goats and Sheep, Estrada Sobral/Groaíras, km 04, CP 145, CEP 62010-970 Sobral, CE, Brazil., Oliveira MEF; Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900 Jaboticabal, SP, Brazil. Electronic address: mef.oliveira@unesp.br.
Jazyk: angličtina
Zdroj: Animal reproduction science [Anim Reprod Sci] 2024 Feb; Vol. 261, pp. 107396. Date of Electronic Publication: 2023 Dec 14.
DOI: 10.1016/j.anireprosci.2023.107396
Abstrakt: Results with the use of hCG after synchronization protocol are still inconsistent, which may vary according to breed, season, day of application and dose of the drug used. The aim of the present study was to evaluate the functionality of luteal tissue and ovarian perfusion after hCG treatment during early luteal phase. Estrus-synchronized ewes were randomly assigned to receive i.m. injection of 300 IU of hCG (G-hCG; n = 40) or 1 mL of saline (G-Control; n = 32) on Day 7.5 after progesterone withdrawal. Ultrasonographic evaluations of the ovaries and ovarian and iliac arteries were performed on Days 7.5, 10.5, 13.5, and 21.5. The accessory corpus luteum (aCL) formation rate was 52.5% for G-hCG. There was interaction (p > 0.05) for treatment (G-hCG and G-Control), days (7.5, 10.5, 13.5 and 21.5) and PD (Pregnant and Non-pregnant) for the variables of biometric characteristics of the corpus luteum B-Mode and Color Doppler on days 7.5, 10.5, 13.5 and 21.5. There was no difference (p > 0.05) for pregnancy rates and mean fetuses per ewe between the treatment groups. It is concluded that the application of hCG 7.5 days after the hormonal protocol in Morada Nova ewes in a breeding season is efficient in inducing aCL formation and increasing luteal tissue biometry. However, there was no effect on pregnancy rate.
Competing Interests: Declaration of Competing Interest I, Joedson Dantas Gonçalves, declare that I do not have any personal or financial interests that could influence or bias my actions, decisions, or judgments in any professional capacity. I have no affiliations, investments, or relationships that could create conflicts of interest. I acknowledge that conflicts of interest can compromise objectivity, fairness, and integrity, and I am committed to maintaining the highest level of ethical conduct in all my endeavors. I will disclose any potential conflicts of interest that may arise during the course of my work, and take appropriate steps to mitigate or address them transparently and in accordance with relevant laws, regulations, and organizational policies. Furthermore, I understand that any actions or decisions I take in my professional role should be based on merit, relevant expertise, and the best interests of the individuals, organizations, or entities that I serve. I will act in a fair, impartial, and transparent manner, and avoid any actions that could compromise my ability to fulfill my professional duties objectively and with integrity. hereby affirm that the above declaration accurately reflects my current understanding and commitment to upholding high standards of integrity, transparency, and ethical conduct in all my professional endeavors.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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