Cyclicity 1 (Chapter 7) Flashcards
(18 cards)
What is polyestrus cycling and what animals exhibit this?
Year round cycles
Cow, queen, pig, rodents
What is an animal that exhibits seasonal polyestrus (long day)?
Mare
What animals exhibits seasonal polyestrus (short day)?
Ewe, doe, elk
What is monoestrus and what animals exhibit this?
Cycle once a year
Carnivores: dogs, wolf, fox, bear
Which animal has the shortest estrous cycle?
Sheep
What is the term for an animal when it is not cycling?
Anestrus
What are the concentrations of progesterone and estrogen during the Follicular Phase?
Progesterone: low
Estrogen: high
Ovulation takes place after what Phase and Stage?
Follicular Phase
Estrus Stage
What are the concentrations of progesterone and estrogen during the Luteal Phase?
Progesterone: high
Estrogen: low
Before what Phase and Stage does luteolysis take place and what is hormone responsible for this?
Follicular Phase/Proestrus
Prostaglandin F2Alpha is secreted from the uterus
During what Phase is the oocyte available for fertilization?
Luteal Phase
What is the name of the Stage before Estrus?
Proestrus
What occurs during Estrus and what hormone has the highest concentration?
The animal goes into heat
Increase in estrogen
What is present during Metestrus and what are the concentrations of progesterone and estrogen?
Corpus hemorrhagicum
Progesterone: low
Estrogen: low
What is present during Diestrus and what are the concentrations of progesterone and estrogen?
Corpus Luteum
Progesterone: high
Estrogen: low
Proestrus and Estrus make up what Phase?
Follicular Phase
Metestrus and Diestrus make up what Phase?
Luteal Phase
What is unique about a dogs Diestrus?
It last two months and the Corpus Luteum will stay and produce progesterone, regardless if there was a successful pregnancy or not
