Dictionary > Oestrus

Oestrus

Definition
noun
A phase in the sexual cycle of female animals characterized by their sexual receptiveness or their willingness for a coitus
oestrual
Of or pertaining to sexual desire; mostly applied to brute animals; as, the oestrual period, oestrual influence
Supplement
Oestrus is a phase in the sexual cycle (i.e. oestrous cycle) of female animals. It is characterized by sexual receptiveness in females. Females are said to be in heat during this phase. Other cues include a bloody vaginal discharge. Physiologically, the phase is regulated by gonadotropic hormones. When the ovarian follicles mature, estrogen is secreted. They then display behavioural manifestations indicating their sexual receptiveness.1
Oestrus begins following sexual maturity, and is interrupted by pregnancies and anestrous phases. Anestrous phase pertains to that period when the sexual cycle rests. Melatonin released from the pineal gland regulates reproduction. One of the factors controlling the release of melatonin is light exposure.
Word origin: Greek oîstros (mad desire)
Variant(s):

  • estrus

Synonym(s):

  • estrum
  • heat (2)
  • See also:

    Related term:

  • oestrous cycle
  • Reference(s):

    1 Miller, G., Tybur, J. M., and Jordan, B. D. (2007). Evolution and Human Behavior. Ovulatory cycle effects on tip earnings by lap dancers: economic evidence for human estrus? Evolution and Human Behavior 28(6): 375–381.


    You will also like...

    running freshwater community
    Running Water Freshwater Community Factors

    This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

    Golgi apparatus (3-D illustration)
    Role of Golgi Apparatus & Endoplasmic Reticulum in Protein Synthesis

    The endoplasmic reticulum and Golgi apparatus are the organelles involved in the translation step of protein synthesis a..

    DNA molecule
    Genetic Control – On and Off Genes

    Genes are the blueprint of our bodies, a blueprint that creates a variety of proteins essential to any organism's surviv..

    vitamins
    A Balanced Vitamin Diet – Vitamins A – K

    A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

    dinosaurs
    The Dinosaurs

    Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

    Growth Patterns
    Growth Patterns

    This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..

    Related Articles...

    No related articles found

    See all Related Topics