Puberty MCQ's

Question 1

A useful measure of puberty in a bull is the age at which there are sufficient sperm present in the ejaculate to successfully breed females.
True
False

Answer 1

True

Question 2

Puberty occurs at 6-7 months of age in
heifers.
gilts.
fillies.
bulls.

Answer 2

gilts.

Question 3

Major factors affecting the timing of puberty involve hormonal, genetics, nutrional and environmental effects.
True
False

Answer 3

True

Question 4

In the stallion, there is an initial increase in GnRH pulse amplitude and frequency which drives maturation of Leydig and Sertoli cells but does not result in an increase in testosterone.
True
False

Answer 4

True

Question 5

Several months before sperm production in the stallion, FSH increases without an increase in LH. The FSH effects Sertoli cell multiplication and maturation.
True
False

Answer 5

True

Question 6

Just before sperm production in the stallion, testosterone will begin to rise.
True
False

Answer 6

True

Question 7

In the female, a decrease in estradiol negative feedback leads to increasing GnRH pulse frequency and amplitudes until a GnRH surge occurs. The resulting LH surge causes ovulation.
True
False

Answer 7

True

Question 8

In the female, it is estradiol exposure that causes the formation of the GnRH surge center in the hypothalamus.
True
False

Answer 8

False

Question 9

In the male, alpha fetal protein binds testosterone and prevents testosterone from entering into the brain. The GnRH surge center will then not develop as it requires testosterone conversion to estradiol.
True
False

Answer 9

False

Question 10

The first ovulation in the female is associated without an estrus due to lack of previous progesterone in the female. In subsequent cycles, the progesterone during diestrus sensitizes the hypothalamus so that it will respond to lower estrogen levels and cause estrus behavior when estradiol increases from the preovulatory follicle.
True
False

Answer 10

True

Question 11

A reduction in nutrition will not change the time of puberty in cattle.
True
False

Answer 11

False

Question 12

The difference in age of puberty of brahma and jersey cattle is an example of genetic effects on puberty.
True
False

Answer 12

True

Question 13

In the gilt, which of the following would result in the earliest age of puberty.
2 to 3 gilts housed together
15 - 20 gilts housed together
2-3 gilts housed together and given fence line contact with a boar twice a day
15-20 gilts housed together and exposed to fence line contact with a boar once a day

Answer 13

15-20 gilts housed together and exposed to fence line contact with a boar once a day

Question 14

In an experiment, ewe lambs were ovarectomized before puberty and then given estradiol implants. LH was monitored and found to increase at the expected age of puberty. This experiment demonstrates
that the GnRH surge center develops at puberty.
that the negative feedback of estradiol on GnRH decreases as puberty approaches.
the increase in positive feedback of estradiol as puberty approaches.
that GnRH is not regulated by ovarian steroids.

Answer 14

that the negative feedback of estradiol on GnRH decreases as puberty approaches.

Question 15

If ewe lambs were overectomized (ovaries removed) at 18 weeks of age and then given an estradiol implant, at about 27-34 weeks of age which of the following would be true?
LH levels would increase due to a change in the sensitivity of the hypothalamus to estradiol.
LH levels would decline due to negative feedback effects of estradiol on the hypothalamus.
LH levels would remain constant but estradiol levels would begin to increase.
The ewes would ovulate.

Answer 15

LH levels would increase due to a change in the sensitivity of the hypothalamus to estradiol