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
The degree of the vaginal epithelium maturation (quantity of superficial cells without nuclei) in the smears of the first group of dairy cows during the first estrus cycle
(27-64 days postpartum) was 97% (Table 4).
A: The estrus cycle
of a doe is triggered by the amount of light in the day.
Kippenberger routinely treated racing greyhounds with steroids to control the dogs' normal estrus cycle
Plasma estradiol concentrations decreased on about day 6 of the estrus cycle
and remained low from days 7-15 compared with the pre-luteal (Figure 3, left panel) and follicular phases (Figure 3, middle panel).
True or False: If does are not bred during their first estrus cycle
, or during the primary rut, they will go into heat again 28 days later.
If a doe conceives just one estrus cycle
late the fawn(s) of course will wean a month later than intended.
A doe estrus cycle
lasts around 25 days, maybe a little less, maybe a little more.
It is unlikely that many does are going to go through an estrus cycle
without getting bred.
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.
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.