Estrous Cycle and Related Factors Flashcards
Stages of estrus cycle
- Estrus,
- Metestrus
- Diestrus
- Proestrus
time of sexual receptivity, sometimes referred to as heat
Estrus
Ovulation usually, but not always, occurs at the end of estrus
Estrus
the early postovulatory period, during which the CL begins development
Metestrus
the period of mature luteal activity, which begins about 4 days after ovulation and ends with regression of the CL
Diestrus
period beginning after CL regression and ending at the onset of estrus
Proestrus
During proestrus, rapid follicle development leads to ovulation and to the onset of sexual receptivity
Proestrus
Factors Affecting the Estrous Cycle
- Photoperiod
- Nutrition
- Species Differences
Factors Affecting the Estrous Cycle:
Most important factor associated with seasonal breeders
Photoperiod
Factors Affecting the Estrous Cycle:
____________ become anestrous late in the fall, then resumes in late winter or early spring
Photoperiod in queen and mare
Factors Affecting the Estrous Cycle:
In ________, the ovarian cycle is quiet starting late winter or early spring, then resumes in fall
Photoperiod in ewes and does
Factors Affecting the Estrous Cycle:
Intraspecies differences in photoperiod requirements also differ, due to
their origin and
environmental differences
Factors Affecting the Estrous Cycle:
Animals ingesting sound nutritional regimens reach puberty at an earlier age than nutritionally deprived animals
True
Factors Affecting the Estrous Cycle:
influence of nutrition on the estrous cycle is most apparent at
puberty and or
reestablishment of the estrous cycle after parturition
Factors Affecting the Estrous Cycle:
breeding seasons can be delayed if calves are deprived of adequate nutrition
true
