estrus cycle


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Related to estrus cycle: anestrous

estrus cycle

Etymology: Gk, oistros, gadfly, kyklos, circle
the periodic changes in the female body that occur under the influence of sex hormones.

estrus cycle

The sequence from the beginning of one estrus period to the beginning of the next. It includes proestrus, estrus, and metestrus, followed by a short period of quiescence called diestrus.
See also: cycle

cycle

a succession or recurring series of events.

cardiac cycle
a complete cardiac movement, or heartbeat, including systole, diastole, and the intervening pause.
The cycle includes eight separate phases: (1) isovolumetric contraction; (2) maximum ejection; (3) reduced ejection; (4) protodiastole (onset of ventricular relaxation); (5) isovolumetric relaxation; (6) rapid flow; (7) diastasis (onset of atrial contraction); (8) atrial systole.
cell cycle
the cycle of biochemical and morphological events occurring in a dividing cell population; it consists of the S phase, occurring toward the end of interphase, in which DNA is synthesized; the G2 phase, for gap 2, the interval between S and M; the M phase, for mitosis, consisting of the four phases of mitosis; and the G1 phase, which lasts from the end of M until the start of S phase of the next cycle. Fully differentiated cells are nondividing and are said to be in G0.
Enlarge picture
Cell cycle. By permission from Booth DM, Small Animal Clinical Pharmacology and Therapeutics, Saunders, 2000
citric acid cycle
estrus cycle
see estrous cycle.
Krebs cycle
ovarian cycle
the sequence of physiological changes in the ovary involved in ovulation. See also ovulation and reproduction.
reproductive cycle
the cycle of physiological changes in the reproductive organs, from the time of fertilization of the ovum through gestation and parturition. See also reproduction.
sex cycle, sexual cycle
1. the physiological changes recurring regularly in the reproductive organs of female mammals when pregnancy does not supervene.
2. the period of sexual reproduction in an organism that also reproduces asexually.
tricarboxylic acid cycle
urea cycle
a cyclic series of reactions that produce urea, a major route for removal of the ammonia produced in the metabolism of amino acids in the liver and kidney. See also urea.
References in periodicals archive ?
A young female's chance of becoming pregnant early is greater if she has reached puberty in time to have two or three estrus cycles before the start of the breeding season.
The rats were examined to establish the estrus cycle by a daily collection of vaginal smear for 8 days before the start of the experiment.
We observed estrus cycles with no normal epithelial cell reconstruction in the vagina.
Therefore, based on these differences in progesterone concentrations between low and high fecundity groups, our data also suggest that there are more follicles present during subsequent waves of follicular development in the estrus cycle among HP goats and that they mature at a smaller size than those in PP animals.
Influence of short photoperiods on reproductive organs and estrus cycles of normal and pinealectomized female djungarian hamsters, Phodopus sungorus.
It is unlikely that many does are going to go through an estrus cycle without getting bred.
The second rut will have some early fawns entering their first estrus cycle and un-bred does coming into estrus again creating a much lower profile.
These histological features of endometrium development the first three estrus cycles evidence a gradual development which depends on ovarial hormones which determine an optimal expression of gilt reproductive capacity in ther third estrus cycle
There are five options, including; Doe "P", an attractor scent made of 100-percent doe urine, best used in September and October early archery seasons; Whitetail Heat, collected during real does' estrus cycle, used in mock scrapes and drippers; Young Buck, to spark a dominant buck's territorial instincts; Curiosity Scent, appealing to the social nature of whitetail deer, employed as a cover scent or attractant; and Tarsal Gland Lure, which is best during rut and pre-rut periods in combination with drags, scrapes and mock scrapes.
Such calls, even when dealing with a buck that's willing to fight, focus on the rut and where does are in their estrus cycle.
Conventional theory is that with few bucks in any given deer population, not all does may be bred during their first estrus cycle (heat).