Custer, "Physiological mechanisms controlling anestrus
and infertility in postpartum beef cattle," Journal of Animal Science, vol.
Short term primings with different progestagen intravaginal devices (MAP, FGA and CIDR) for eCG-estrous induction in anestrus
Toward the end of anestrus
, circulating concentrations of LH begin to increase due to onset of a high-frequency mode of pulsatile LH secretion.
Since the mare is usually in winter anestrus
, artificial lighting is used to induce follicular activity.
* Monestrous (mohn-ehs-truhs) One estrous cycle each year, followed by a period of anestrus
Montiel F, Ahuja C (2005) Body condition and suckling as factors influencing the duration of postpartum anestrus
in cattle: a review.
, the period between heats in female animals
Depending on the breed, they may then enter an anestrus
period that lasts until the start of the next breeding season.
The technology is also used to treat anestrus
beef cows that do not cycle because the physical demands of a suckling calf cause a negative energy balance.
[E.sub.2] and [P.sub.4] concentrations of females with cubs and females with yearlings did not differ, presumably because all females with nursing offspring (cubs and yearlings) are in lactational anestrus
. The two groups were thus pooled into one group (n = 54) to study relationships between the independent factors and [P.sub.4].
However, limited amounts of data are available concerning the effects of exogenous hormones, such as melatonin (MEL) and progesterone ([P.sub.4]), on oocyte quality for in vitro production (IVP) of embryos during seasonal anestrus
. The aim of this study was to evaluate the effects of MEL and controlled internal drug release (CIDR) device on follicular development and oocyte quality in FSH- treated ewes.
period may be correlated with the strength of Calanus copepod production, as it appears to be in northern right whales (Balaena glacialis; Kenney, 1997, 1998).