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
| Autor: | Morgana Cardoso Brasileiro Borges Bastos, Lilian Porto da Oliveira, Isabela Costa Vasconcelos, Ana Karina da Silva Cavalcante, Priscila Assis Ferraz, Larissa Pires Barbosa, Mónica Madrigal-Valverde, Lindomar Sousa Brito, Luiz Di Paolo Maggitti Junior, João Vitor Gomes da Silva Carvalho, Antonio de Lisboa Ribeiro Filho, Osvaldo Santos de Brito, Marcus Vinícius Galvão Loiola, Rodrigo Freitas Bittencourt |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Ovulation
medicine.medical_treatment media_common.quotation_subject Luteal phase Dinoprost Chorionic Gonadotropin Andrology chemistry.chemical_compound Endocrinology Ovarian Follicle Food Animals Corpus Luteum Follicular phase medicine Animals Equine chorionic gonadotropin Insemination Artificial Progesterone media_common Dose-Response Relationship Drug Estradiol business.industry Artificial insemination General Medicine Estradiol cypionate medicine.anatomical_structure chemistry Estradiol benzoate Cattle Female Animal Science and Zoology Estrus Synchronization business Acupuncture Points Corpus luteum medicine.drug |
| Zdroj: | Animal Reproduction Science. 223:106631 |
| ISSN: | 0378-4320 |
| DOI: | 10.1016/j.anireprosci.2020.106631 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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