* If you want to update the article please login/register
Many follicles appear to develop during every menstrual cycle, but only in a limited number ovulate. The physiological mechanism that controls ovulation number is unknown; a number of mathematical models can explain it, but these models have no physiological basis; no physiological evidence exists. We propose a physiological process for ovulation number control, which allows the selection of a limited number of follicles out of many others, as well as modeling it in a mathematical model of follicular growth. The androgen inhibitory thresholds determine the ovulation number. This strategy also discusses how chronic hyperandrogenism disrupts ovulation in polycystic ovary syndrome, a common cause of fertility infertility.
Source link: https://doi.org/10.3389/fendo.2022.816967
The study combined Oxford Nanopore Technologies full-length transcriptome and metabolomics to examine the differences in gene expression and metabolite accumulation in the ovaries between pre-ovulation and consecutive ovulation Muscovy ducks in order to identify candidate genes and metabolites related to Muscovy duck follicular ovulation. In summary, the novel potential mechanisms that influence ovulation in Muscovy ducks may be related to lipid metabolism, and the findings may contribute to improved knowledge of changes in the waterfowl ovarian regulatory network, providing new insight into the ovulation process and aiding in a better understanding of shifts in the waterfowl ovarian development network.
Source link: https://doi.org/10.3389/fvets.2022.890979
We tested the hypothesis that increased LH activity [lower-dose human chorionic gonadotropin] before the anticipated time of diameter change could influence circulating FSH concentrations, maximum size of the second largest and third largest follicles, and frequency of multiple ovulations in lactating dairy cows with low progesterone concentrations, according to previous physiological findings. Double ovulation was 40% for control cows with no hCG and 62. 5 percent with hCG. 9. 5 and F2 9. 5 The hCG group had more cows with F2 > 11. 5 than with 9. 5 u2264 11. 5 and F2 9. 5 than with 9. 5. The hCG group's maximum sizes of F2 and F3 were higher in the hCG group, according to the hCG group, but FSH concentrations were lower after F1 > 8. 5 mm relative to CONT. Regardless of hCG therapy, the results were higher before deviation in cows with double ovulations and in those with single ovulations. In addition, the transition from aspiration to deviation was quicker in cows with double rather than single ovulation and in cows treated with hCG as a result of faster F1, F2, and F3 growth rates before diameter deviation was reduced. In conclusion, higher FSH and follicle growth before deviation seems to be the primary cause of increased frequency of double ovulation in lactating cows with low circulating P4. In addition, the rise in follicle growth before deviation and in the maximum size of F2 during hCG therapy indicates that increased LH may also play a role in boosting double ovulation.
Source link: https://doi.org/10.3168/jds.2021-21767
Artificial insemination is the most important biotechnology in pig reproduction. After ovulation, the best time for AI is 12 h before to 4 h after ovulation. 14 DanBred sows were tested for ovulation via ultrasound scans every 8 h over a period of 72 hours, beginning 80 h after weaning, on this basis, as well as rectal fecal samples were collected and analyzed for their estrogen levels to determine potential correlations to ovulation time. Compared to nearly all other times in time, there was a significant decrease in fecal estrogen levels 4 h before ovulation.
Source link: https://doi.org/10.1016/j.rvsc.2022.05.005
The aim of the study was to investigate follicular dynamics and concentrations of estradiol-17-30, progesterone, follicle stimulating hormone, and luteinizing hormone during the oestrous cycle and determine ovulation time in Mithun cows. The plasma samples were analyzed repeatedly during the interovulatory period to determine the differences in the hormonal profiles of various follicular wave cycles. No significant differences were found on the day of wave emergence, number of follicles recruited, maximum diameter of the ovulatory dominant follicle, growth rates of ovulatory and anovulatory dominant follicles, and maximum diameter of corpus luteum, according to the two and three waves.
Source link: https://doi.org/10.1111/rda.14196
According to the signaling theory, ingenuity may have originated as a warning for mates. If we consider creativity as a signal, we should expect it to be enhanced in the context related to sexual selection. However, both male and female have physical and mental characteristics that can attract a mate. Women can be more creative during times of peak fertility, according to previous studies. During ovulation, women's ideas were more original than those during non-fertile periods of the ovulatory cycle.
Source link: https://doi.org/10.3389/fpsyg.2022.859108
Kisspeptins are the most potent motivating neurotransmitters of GnRH release, and in turn, the KP administration induces LH and/or FSH release. In small ruminants, KP or its derivatives, LH surge accompanied by ovulation in both cyclic and acyclic animals, as in the mare, KP raised LH plasma levels but failed to cause ovulation. Following initiation between the Bu and CTRL groups at h6 and h8, significantly higher plasma LH levels were discovered. Correlations between corpora lutea and VA with serum progesterone concentrations were 0. 31, P = 0. 31, P = 0. 01, P = 0. 38, respectively. After C6 treatment, the Ovulation rates were similar to that of Bu, although not different from the CTRL. In every group, pregnancy rates were comparable to those in terms of fresh extended donkey semen.
Source link: https://doi.org/10.1016/j.theriogenology.2022.06.014
* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions