Phases of ovarian cycle, Biology

Phases of Ovarian Cycle

In non-mammalian vertebrates the ovarian cycle consists of the following phase;

  1. Pre breeding phase
  2. Breeding phase and
  3. Post breeding phase.

During pre breeding phase growth and differentiation of the ovarian follicles takes place. The follicles start accumulating yolk and at the end of this phase the follicles are ready for ovulation and fertilisation. Breeding phase is the period of ovulation, mating and fertilisation. This phase is followed by the post breeding phase in which ovary contains the spent follicles, or postovulatory follicles (the follicles from which the ovum is expelled during ovulation), some follicles which failed to ovulate, and atretic follicles. Degeneration and disintegration of postovulatory and atretic follicles also take place during post breeding phase.

In some of the animals there is a resting phase in which no gametoganic activity takes place. All the germ cells are at rest for some time before entering into the follicular or the pre-breeding phase. In the male animals testicular activity is a continuous process. Spermatogenesis takes place throughout the year, but spermiation (release of sperms) parallels with the ovulatory phase of the females. The reproductive cycles are regulated by-ho-pones from the pituitary and the gonads. Apart from the endogenous mechanisms, external stimuli also effect the gonadal activity.

Posted Date: 1/16/2013 7:57:26 AM | Location : United States







Related Discussions:- Phases of ovarian cycle, Assignment Help, Ask Question on Phases of ovarian cycle, Get Answer, Expert's Help, Phases of ovarian cycle Discussions

Write discussion on Phases of ovarian cycle
Your posts are moderated
Related Questions
Biodiversity provides us with life -sustaining services. As discussed below, these ecosystem services have a much higher value than most people realize. At the ecosystem level, bio

Ethylene production - Responses to Infection Ethylene is also induced in response to infection. It is also known to be produced under other stress conditions like wounding

Secondary Induction The two primary inductive events that we have described so far are significant in the patterning of early embryo. But there are another such signaling eve


Explain the Importance of Biochemical Tests? Specific series of biochemical tests have been developed for fast identification of microorganisms in laboratories. These biochemic

F a t cow syndrome Fat cow syndrome, also known as fatty infiltration of liver, is a highly fatal disease in high yielding dairy animals that occurs a few days before or afte

Explain about the Prebiotics? Ingredients/compounds that have a beneficial effect on microflora in the large intestine of the host e.g. fibre, fructo oligosaccharides, lactulos

Protozoa general characters and classification

Diuretic Therapy One of the aims of treatment of congestive heart failure is directed toward controlling salt and water retention (central or peripheral edema). Diuretics provid

Breast Cancer Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4