PRACTICE QUESTIONS

1. The first estrous cycle of the cow subsequent to parturi­tion follows which sequence?

a. Anestrus, diestrus, estrus, metestrus, proestrus

b. Anestrus, estrus, diestrus, metestrus, proestrus

c.

d. Anestrus, proestrus, estrus, diestrus, proestrus

e. Anestrus, proestrus, estrus, metestrus, diestrus

2. The usual situation in large domestic animals is for a dominant follicle or dominant follicles to be present at the time of Iuteal regression, with sexual receptivity manifested within 1 to 2 days after luteal regression; the one large animal species that is the exception to this generalization is the:

a. Cow

b. Doe

c. Ewe

d. Mare

e. Sow

3. The hormones that form the foundation for sexual receptivity are:

a. Estrogen and PGF_2α

b. Progesterone and estrogen

c. Estrogen and GnRH

d. Progesterone and PGF_2α

e. PGF_2o and GnRH

4. Decreasing light turns off cyclical ovarian activity after a number of months, whereas increasing light reverses the process after a number of months, including the develop­ment of a transitional period. This description fits which domestic species?

a. Cat

b. Cow

c. Dog

d. Goat

e. Horse

f. Pig

g. Sheep

5. What response results from the Whitten effect, in which the introduction of a male into a group of noncyclical animals results in the reestablishment of ovarian activity?

a. Increased estrogen secretion

b. Increased progesterone secretion

c. Increased prolactin secretion

d. Increased follicle-stimulating hormone secretion

e. Increased luteinizing hormone secretion

f. Increased follicle-stimulating hormone and lutein­izing hormone secretion

6. One of the domestic species requires progesterone priming, in addition to estrogen, to manifest estrus. Therefore this species does not manifest estrus with the first ovarian cycle in the postpartum period. The animal is the:

a. Cat

b. Dog

c. Goat

d. Horse

e. Pig

f. Sheep