Affordable Access

Publisher Website

Effects of equine chorionic gonadotropin administered via the Baihui acupoint on follicular ovarian dynamics and the luteal function of cattle during an ovulation synchronization treatment regimen for fixed-time artificial insemination.

  • Brito, Lindomar Sousa1
  • Maggitti Junior, Luiz Di Paolo2
  • Ferraz, Priscila Assis2
  • Vasconcelos, Isabela Costa2
  • Carvalho, João Vitor Gomes da Silva2
  • Loiola, Marcus Vinicius Galvão2
  • Bittencourt, Rodrigo Freitas2
  • Madrigal-Valverde, Mónica3
  • Cavalcante, Ana Karina da Silva4
  • Barbosa, Larissa Pires4
  • Oliveira, Lilian Porto da5
  • Bastos, Morgana Cardoso Brasileiro Borge...5
  • Brito, Osvaldo Santos de5
  • Ribeiro Filho, Antônio de Lisboa2
  • 1 Department of Anatomy, Pathology and Veterinary Clinics, Federal University of Bahia (UFBA), Av. Ademar de Barros 500, Ondina, Salvador, Bahia, 40170-110, Brazil. Electronic address: [email protected] , (Brazil)
  • 2 Department of Anatomy, Pathology and Veterinary Clinics, Federal University of Bahia (UFBA), Av. Ademar de Barros 500, Ondina, Salvador, Bahia, 40170-110, Brazil. , (Brazil)
  • 3 Animal Sciences Deparment, University of Costa Rica (UCR), Campus Rodrigo Facio, San José, Costa Rica. , (Costa Rica)
  • 4 Center for Agricultural, Biological, and Environmental Sciences (CCAAB), Federal University of Recôncavo of Bahia (UFRB), Cruz das Almas, Bahia, Brazil. , (Brazil)
  • 5 Federal Institute of Education, Science and Technology Baiano (IF Baiano), Catu, Bahia, Brazil. , (Brazil)
Published Article
Animal reproduction science
Publication Date
Dec 01, 2020
DOI: 10.1016/j.anireprosci.2020.106631
PMID: 33137692


Objectives were to evaluate effects of a smaller than typically used dose of equine chorionic gonadotropin (eCG) during a fixed-time artificial insemination (FTAI) treatment regimen. Transrectal ultrasonic (US) examinations were conducted on dairy cows on Day 0 (D0) and the treatment regimen was initiated with administrations of an intravaginal progesterone (P4) implant, estradiol benzoate (im), and prostaglandin F2α (PGF2α; im). On D8, the P4 implant was removed and PGF2α and estradiol cypionate were administered to all animals. Subsequently, cows were randomly assigned to three groups and eCG was administered to Groups 1, 2, and 3 in doses of 300 (im); 100 (im); and 100 (Baihui acupoint) IUs, respectively. The B-mode and power-flow US cineloops were performed to assess follicular dynamics and evaluate various morphological and vascular characteristics of the corpus luteum. Blood samples were collected to quantify serum P4 concentrations. There were no differences between the ovulation synchronization treatment regimens for all follicular dynamic variables tested; however, cows in Group 3 differed from Group 2 having a larger follicle diameter (FD) on D10 (P = 0.06) and larger preovulatory FD (P = 0.09), as well as a blood perfusion area of the dominant follicle wall on D8 (P = 0.07). There were no differences in responses to the ovulation synchronization treatment regimens for the luteal variables evaluated subsequent to ovulation. In conclusion, the Baihui acupoint was effective as an alternative route for eCG dose reduction when FTAI treatment regimens were imposed without detrimentally affecting values for reproductive variables. Copyright © 2020 Elsevier B.V. All rights reserved.

Report this publication


Seen <100 times