Lecture 1 with lab lect Flashcards
Where do the hormones LH and FSH get released from?
Anterior pituitary -> to follicle
What releases estrogen and what does it have an effect on?
Follicle releases estrongen, goes to Anterior pituitary for negative feedback for FSH
Goes to surge center of brain as positive feedback
What hormone stimulates the anterior pituitary to release LH and FSH?
The hypothalamus releases GnRH
What are the 4 important reproductive hormones?
Estrogen
Progesterone
Lutealizing hormone
Follicle stimulating hormone
What stage does estrogen rise in?
Proestrus
What happens to estrogen when ovulation occurs?
It is steadily decreasing
What causes ovulation to occur?
LH surge
What hormones are active during anestrus?
FSH
How long does average proestrus last in a dog?
9 days
Estrus?
9 days
What is happening to progesterone during estrus?
Increasing steadily
How long does the average Diestrus last in the dog?
50 days
What can we say we DO know if we see elevated P4?
The dog has ovulated in the last 2 months.
What marks anestrus? How long is it?
progesterone drops down to <1ng/ml - lasts ~6 mo
What hormonal change is important in late stage proestrus?
Progesterone increase
What hormonal change is important in late stage proestrus?
Progesterone increase
What is the best indicator or estrus?
LH surge
T/F Dogs develop a CL prior to ovulation?
T
What type of oocyte is ovulated in dogs?
Primary (needs second division before fertilization can occur)
When can fertilization occur in a dog?
2 days after ovulation (and lasts 2 days)
T/F the bitch has serum P4 levels during diestrus which are the same regardless of being bred or not and regardless of pregnancy or not.
TRUE
What is the scientific name for false pregnancy?
Pseudocyesis
What causes the development of mammary glands in late gestation AND late diestrus in some dogs?
Decline in progesterone
Feline reproductive facts
long day, seasonally polyestrus, induced ovulators, P4 comes from CL and placenta, Super-fecundation (multiple dads). Super-fetation (different ages in one litter)
