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CH7 Reproductive cyclicity - Coggle Diagram
CH7 Reproductive cyclicity
Anestrous (without heat)
Causation: Pregnancy , lactation, presence of offspring, season, stress and pathology
Behavioral anestrous
Lactational anestrous
Prevents new pregnancy before young are weaned (need 2 or less sucklings/day to return to cyclicity)
Gestational anestrous (pregnant)
Seasonal anestrous
Preventing females from conceiving during periods of low survival rate of embryo and neonate
long day breeders
Kisspeptin-10 secretion stimulated by RFRP-3--> stimulation of GnRH to release FSH and LH
Short day breeders
Kisspeptin -10 secretion inhibited by RFRP-3 --> NO stimulation of GnRH to release FSH and LH
Nutritional anestrous
Negative feedback if female cannot receive enough dietary energy to meet metabolic needs
Estrous Cycle
Estrous (Adj.) Period between one estrus and the next (21 days in a pig)
Seasonally polyestrus
Only in estrus during a certain season "cluster estrus"
polyestrus
Uniform estrus cycles throughout the year
monoestrus
One cycle per year
Estrus (noun) period of sexual receptivity
Follicular phase 20% of cycle
Period from regression of corpora lutea to ovulation
the primary ovarian structure large growing follicles secrete the primary hormone estradiol
Proestrus
Begins when progesterone declines from the destruction of CL 2 to 5 days. FSH and LH are responsible
Formation of ovulatory follicles and E2 secretion (attraction of males)
Estrus
Visible behavioral symptoms (sexual receptivity and mating) estradiol is dominant
Sexual receptivity and peak E2 secretion
Luteal Phase 80% of cycle
Period from ovulation to corpora lutea regression
The primary structure corpora lutea (CL) secretes the primary hormone progesterone
Metestrus
period between ovulation and formation of the functional CL. New follicle remodels via luteinization progesterone secretion begins is more detectable post ovulation
CL formation and beginning of P4 secretion
Diestrus
Longest stage CL is fully functional and P4 secretion is high. Ends when CL is destroyed. High p4 prompts uterus to make a suitable environment for early embryo development and eventual attachment (10 to 14 days)
Sustained luteal secretion of P4
Menstrual cycle
No defined period of sexual receptivity
A period of endometrial sloughing called menses (menstruation) (period)(5+ days)
Time line begins with menses, not ovulation or estrous
Lasts 28 days in women
Ovulation occurs mid cycle
Luteal phase (secretory phase) 14days
Lack of cyclicity is Amenorrhea in women