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.

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.

Cell cycle. By permission from Booth DM, Small Animal Clinical Pharmacology and Therapeutics, Saunders, 2000

citric acid cycle

see tricarboxylic acid cycle.

estrus cycle

see estrous cycle.

Krebs cycle

see tricarboxylic acid 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

see 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.

From simple beginnings to genetic engineering

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.

El aprendizaje en base a puntos de referencia en una tarea de navegacion no se ve afectado por el ciclo estral de la rata

We observed estrus cycles with no normal epithelial cell reconstruction in the vagina.

Pre- and postpartum blood values and postpartum cell content of vaginal smears of female moose and dairy cows (1)

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.

Concentrations of progesterone and estradiol in peripheral plasma during the estrous cycle and after ovariectomy in Huanghuai goats of high or poor prolificacy

Influence of short photoperiods on reproductive organs and estrus cycles of normal and pinealectomized female djungarian hamsters, Phodopus sungorus.

Analisis ultraestructural de la influencia de la pinealectomia y ausencia de luz sobre el colageno en el endometrio de ratas

It is unlikely that many does are going to go through an estrus cycle without getting bred.

Stay with the herd: myths and realities of post-rut deer activity

Short estrus cycle and associated serum progesterone levels in beef cows.

Efecto del destete temporal y progestagenos sobre la eficiencia reproductiva postparto en vacas mestizas Cebu en Anestro: efecto sobre la fertilidad

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.

Scrape hunting: the real deal! Never disregard the active signs of a mature buck

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

Caracterizacion histologica del tracto reproductivo de cerdas como indicador de pubertad y madurez sexual

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.

WASP Archery Products

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.

When whitetail calls work: understand deer to become a more effective caller

Conventional theory is that with few bucks in any given deer population, not all does may be bred during their first estrus cycle (heat).