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W.B.C.S. Main 2018 Question Answer – Physiology – Spontaneous Ovulation.
WBCS ২০১৮ মেইনস প্রশ্নের উত্তর – দেহতত্ব – স্বতঃস্ফূর্ত ওভুলেশন।
Induced ovulation is when a female animal ovulates due to an externally derived stimulus during, or just prior, to mating, rather than ovulating cyclically orspontaneously. Stimuli causing induced ovulation include the physical act of coitus or mechanical stimulation simulating this, sperm and pheromones.Continue Reading W.B.C.S. Main 2018 Question Answer – Physiology – Spontaneous Ovulation.
Pre- and post-ovulatory samples from spontaneously ovulating fish demonstrated a similar pattern of decreasing testosterone and increasing estradiol.
Spontaneous ovulation in females was induced by raising water temperature from 12 to 20 °C and providing spawning substrate of artificial floating vegetation.
The study suggests that pregnancy rates can be improved in RBH by frequent AI in relation to spontaneous ovulation.
She’ll set one foot in that door, see the bubbly on ice and the rose petals adorning the bed and spontaneously ovulate, which is why you’ll need the condoms.
She spontaneously ovulates when mounted by the male.
Unlike spontaneous ovulation, which is synchronized with photoperiod, NPP lesion-induced ovulation at 20–21 °C occurs 10–14 h postlesioning regardless of the time of day the operation is performed.
Five RBH and five virgin heifers (VH; controls) were repeatedly artificially inseminated (AI) at 6 h intervals from onset of oestrus to spontaneous ovulation.
Changes in serum levels of gonadotropin (GtH) and growth hormone (GH) and in levels of gonadotropin-releasing hormone (GnRH) in the pituitary and discrete brain areas were studied in male goldfish during spawning with spontaneously ovulating females.
∙g−1) and held under conditions which promote spontaneous ovulation.
Polyploidy through ageing of the gametes is less likely in the cat than in spontaneous ovulators since ovulation in cats is induced only after coitus.
By tracing these mechanisms of ovulation across the evolutionary tree of mammals, the scientists found that so-called ‘male-induced ovulation’ predates spontaneous ovulation that was likely to have arisen in the common ancestor of primates and rodents about 75 million years ago.
Results indicate that growth rate of follicle and time from synchronized or spontaneous estrous to ovulation must be considered for estrous cycle manipulation and artificial insemination of Creole cows.
Among 100 pregnancies, 39% occurred either spontanously or after ovulation induction, 32% after classical andrological treatment and 26% after assisted reproductive techniques (ART) such as in vitro fertilization, intracytoplasmic sperm injection or intrauterine insemination.
Mammals that ovulate spontaneously – including humans – have theirs further away.
Homologous intrauterine insemination (IUI) both in spontaneous and, preferably, in ovulation induction cycles, is widely recommended as the first choice of assisted conception techniques.
Science is the gift of God and God taught us that ovulation is spontaneous.
But then, when it was discovered that ovulation was spontaneous, the cost was several billion female orgasms.
The experiments indicated that the sterile ovulations were attributed to temporary sterility of the females during maturation either at adolescence or at the beginning of the new breeding season, and not a result of (1) initial ovulations of the season being spontaneous, (2) male sterility, or (3) male-induced pregnancy blockage.
Conclusion: a higher proportion of Creole cows show heat during nighttime, growth rate of ovulatory follicle is higher during synchronized estrous, and time from onset of synchronized estrous to ovulation is longer, when compared with spontaneous estrous.
Chemical agents that have been used to enhance ovulation have also been linked to negative reproductive health consequences such as reduced viability of pregnancy, a higher incidence of spontaneous abortions, and increased risks of breast, ovarian and uterine cancer (Tucker # enn and others.
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