Okay I would like to know these questions because it is part of a test for my animal reproductive physiology class.

2. Explain how a change in photoperiod results in loss of cyclicity in seasonal breeder animals at the end of the breeding season. (i.e., how does the function of the hypothalamic-pituitary-ovarian axis change and what triggers this). (3 pts)



3. A protocol to synchronize estrus in cyclic cows is to give two injections of prostaglandin F2alpha, 14 days apart. Explain how this protocol works in that all cows might be expected to be in estrus after the second prostaglandin F2alpha injection. (2 pts)

If you are really smart like a veterinarian or animal science graduate, your help is much appreciated!

Thank you!!!