Knowledge of estrus
behavior is essential for estimating the best time to artificially inseminate, as the understanding of the factors involved in the expression of estrus
and occurrence of ovulation is an obstacle limiting the success of artificial insemination (Galina et al., 1996).
Angora goats and Mossi goats were known to have a short estrus
lasting only 22 h and 20 h, respectively (McGregor, 2018; Montaldo et al., 2010).
Because of a high degree of variation that exists between the estrus
onset and ovulation, it is necessary to use hormones that induce ovulation resulting in a successful FTAI.
The proportion of each type of vaginal epithelial cell of ewes, during the estrus
manifestation, is shown in Table 1.
"If there are no does in estrus
yet, every buck in the country will be checking all of the doe groups out, and all of the doe groups are generally hitting the food plots," Don said.
Fertility trial in Zebu cattle after a natural or controlled estrus
with prostaglandin F2 alpha, comparing natural mating with artificial insemination.
days to estrus
, days to 1st service, service period, first service conception rate (FSCR), overall conception rate, 120 days in-calf rate and calving to conception interval were recorded.
Determination of estrus
cycle stage: Since menstrual disturbance is a typical clinical feature of PCOS women, estrous cycles were examined in all groups of mice by evaluating the cell types in vaginal smears.
They were found in proestrus, estrus
or metestrus and were considered as reproductive females since there is hormonal stimulation for each phase and a clear indication that they are sexually receptive.
For whatever reason, orphaned female fawns tend to come into estrus
earlier than non-orphaned fawns, so areas where does have been heavily hunted can provide better than average chances for experiencing a second rut.