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ANSC 333 Exam 2 Questions with Complete Solutions.
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ANSC 333 Exam 2 Questions with Complete SolutionsWhat are the two centers located in the hypothalamus? Correct Answer-
tonic and surge
Males do not have a ___ center. Correct Answer-surge (happened during
fetal development)
Protein that when bound, can't cross the blood-brain barrier resulting in
the development of the surge center Correct Answer-alpha-fetoprotein
___ does not bind to alpha fetal protein so it can cross the blood-brain
barrier? Correct Answer-testosterone
___ is hard to measure in circulation and ___ is easy to measure in
circulation. Correct Answer-GnRH and LH
___ is a proxy for GnRH. Correct Answer-LH
Some activity in gonads and hypothalamus occurs before ? Correct
Answer-puberty
A continuous pulse of GnRH is released very 4-6 hours when? Correct
Answer-puberty is reached
,What are the 4 things that control the age of which an individual attains
puberty? Correct Answer-genetics, acute nutrition (short-term nutrition),
long-term nutrition, social environment, photo-period (season)
Where does the primary adipose deposition occur in females? Correct
Answer-mammary glands
___ breeds attain puberty at a younger age than ___ breeds. Correct
Answer-maternal and paternal
Define puberty. Correct Answer-the ability to accomplish reproduction
successfully
Accumulation of fat; body composition; nutritional reserves that mom
can draw from as baby grows; if we feed more or higher quality feed we
obtain higher percentages of fat Correct Answer-long-term nutrition
We want heifers at ___% of their mature BW by the time they attain
puberty? Correct Answer-60-65
Control GnRH by obtaining signals from multiple sources (FA's, etc.)
when it is ideal to start cycling; if one signal is off, the whole message to
start is delayed/absent Correct Answer-kisspeptin neurons
The number of animals in a group can alter the age at which they attain
puberty; pheromones are a big part (presence of a male) Correct
Answer-Social environment
, Affects sheep; most lamb in the spring time; natural breeding season is
in the fall (they can be big enough and fat enough, but if the season is
not right for their system they won't breed ---> negative impact on
hypothalamus) Correct Answer-Photo-period (season)
Many cycles throughout the year (ex: cow, queen, rodents) Correct
Answer-polyestrus
Mares are _________ breeders Correct Answer-seasonal (long day)
Small ruminants, such as sheep are ___ breeder. Correct Answer-
seasonal (short day)
Want to have offspring when? Correct Answer-nutrition is plentiful to
support lactation
One cycle per year Correct Answer-monoestrus (ex: dog, wolf, bear,
fox)
Two phases of estrous cycle Correct Answer-follicular phase and luteal
phase
The follicular phase begins immediately after? Correct Answer-
luteolysis
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