Publications by authors named "Bernardo Marcozzi Bayeux"
Information on the follicular population and oocyte quality of cows in the final period of reproductive life is scarce. The present study aimed to compare the antral follicle count (AFC), oocyte production and embryonic developmental competence of young versus long-lived and senescent Bos indicus beef cows. Nellore cows (Bos indicus) were classified into three groups according to age: young (4-9 years, n = 10), long-lived (14-17 years, n = 10) and senescent (17-23 years, n = 10).
View Article and Find Full Text PDFWe evaluated the effect of the antral follicle count (AFC) on ovarian follicular dynamics, pregnancy rates, progesterone concentrations, and transcriptional patterns of genes in Nelore cattle (Bos taurus indicus) after a timed artificial insemination (TAI) programme. Cows were separated based on the AFC, and those with a high AFC showed a larger (P < 0.0001) ovarian diameter and area than those with a very low AFC.
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- Differences in reproductive physiology between cattle breeds influence their responses to assisted reproductive techniques, suggesting the need for breed-specific protocols for better efficiency.
- In this study, researchers found that Nelore cows had a higher percentage of advanced chromatin compaction (GV2 and GV3 stages) in their oocytes compared to Holsteins, indicating better developmental competence.
- Two synchronization protocols were tested in Holsteins to improve oocyte quality, with the OPU/D5 protocol yielding more desirable GV stages and allowing further culture that enhanced chromatin configuration in oocytes, highlighting important breed differences in reproductive performance.
Superstimulation prior to the ovum pick-up improves the in vitro embryo production in nulliparous, primiparous and multiparous buffalo (Bubalus bubalis) donors.
Theriogenology
October 2019
The aim of this study was to evaluate the ovarian follicular population, the oocyte yield and the in vitro embryo production (IVEP) of nulliparous (NU), primiparous (PR) and multiparous (MU) buffalo donors submitted to the superstimulation with FSH prior to the ovum pick-up (OPU). A total of 54 buffalo donors (18 NU, 15 PR and 21MU) received an intravaginal progesterone device (1.0 g) plus estradiol benzoate [2.
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