estrus cycle


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Related to estrus cycle: anestrous

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
References in periodicals archive ?
To test this theory of egg viability, Staigmiller and coworkers are taking eggs produced by mature cows and transferring them into heifers at the young females' first or third estrus cycles. Staigmiller says another year of data is needed before the results can be evaluated.
Given this situation, the main aim of the present study was to conduct experiments to specifically see whether landmark learning is affected by the female's estrus cycle. In order to answer this question, circular black curtains surrounded the pool, with two three-dimensional landmarks inside this enclosure, so that no other room cues (like the shape of the room) could provide additional information to find the platform.
In addition to secondary signs of estrus, the stage of estrus cycle was confirmed by the presence of fluctuant Graafian Follicles and the absence of corpus luteum by rectal palpation for all animals prior to AI.
We observed estrus cycles with no normal epithelial cell reconstruction in the vagina.
(2008) who found that 40% of the goats showed estrus cycle ranging from 18 to 21 days.
Effect of biostimulation on uterine involution, early ovarian activity and first postpartum estrus cycle in beef cows.
Progesterone plateaued from days 5 (1.54 [+ or -] 0.26 ng/ml) to 16 of the estrus cycle (1.75 [+ or -] 0.38 ng/ml) for the HP group, and from days 6 (1.43 [+ or -] 0.17 ng/ml) to 15 (1.53 [+ or -] 0.17 ng/ml) for the PP goats.
The new bomb holds Tink's #69 Doe-In-Rut Buck Lure, which is 100 percent natural urine collected from live whitetail does during their estrus cycle. Once you're located and area to use Buck Bomb, simply press the valve tab softly to release short bursts of scent or lock it down and place the bomb on the ground for a continuous spray until the bottle is empty.
Gestation time is relatively constant in moose (about 232 days) (Edwards and Ritcey 1958, Markgren 1969, Miquelle 1990, Schwartz and Hundertmark 1993) and calves conceived in the second estrus are the same size at birth as those conceived in the first estrus, but are born 20-25 days (i.e., an estrus cycle) later (Schwartz and Hundertmark 1993).
Around 28 days after the primary rut, adult does that weren't bred will hit a second estrus cycle. Plus, yearling does that previously weren't mature enough to breed will come into heat for the first time.
Since, this anovulatory follicle become partly luteinized and then regress during the estrus cycle as does a normal corpus luteum (Hafez,1987).