from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An interval of sexual inactivity between two periods of estrus in female mammals that breed cyclically.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In some female animals, a spell of sexual respite in between breeding periods.
from the GNU version of the Collaborative International Dictionary of English
- n. a state or interval of sexual inactivity between two periods of estrus; -- applies to nonhuman mammals.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus
The final factor, and the one which has the greatest likelihood of being controlled, according to Anderson, is a condition known as "anestrus," a period of time in which a cow does not have any viability for reproduction that is often associated with the period of time following the birth of a calf.
Mares on the average cycle from about February through about October, with a dormant period anestrus in the winter.
(Although it is possible to freeze the buffalo semen now, further improvements are needed to achieve higher conception rates.) · Incidence of sub-estrus and anestrus.
After the two months of progesterone production, the dog goes into a three to five month period where there are no reproductive hormones secreted anestrus.
He said that a number of factors have shown to control the length post-partum anestrus, including the presence of the newborn calf; the age of the mother cow; and the body condition score, which is a numerical representation of the cow's physical condition.
Anderson said that with the windows of time for calving and breeding being in close proximity, the period of post-calving, or post-partum, anestrus can have a large impact on calf production for the next year.
Although the mechanism is not understood, he said, nursing and the physical presence of the calf appear to initiate the period of anestrus.
Mare: - granulosa cell tumours are the most common neoplasm in the mare, and the most common indication for ovariectomy - ovary palpates 10-40 cm; unlike cow, it tends to stop growth in size at about 40 cm Clinical Signs Vary: - male-like 45% - anestrus 30% - nymphomania 25%
Luteal Cysts: - follicle that only partially ovulates, because of inadequate LH - a problem mainly of cattle, not horses Clinical Signs: - anestrus (occurring post-partum usually) - Can palpate a unilateral, 35-50 mm diameter, round, smooth, thick walled structure on the ovary 63
"Seasonal anestrus" - no GnRH = no FSH/LH - ovaries largely dormant - uterus atrophies