ANSC 3040 Quiz 2 Test Questions and
Correct Answers.
what is dependent for puberty? - Answer - maturation of the reproductive tract and HPG axis
- genetics (species differences)
- environment (nutrition, health, social cues, and photoperiods)
how do we know if a male is fertile? - Answer 1) behavioral traits
2) first ejaculation
3) first ejaculation WITH spermatozoa
4) the ejaculate contains the correct threshold of sperm for fertilization
when is the male reproductive tract done forming? - Answer by day 125 in utero, everything
after is focused on maturing
what occurs when bulls are 25 WOA? - Answer the lumination process which is the significant
growth of the seminiferous tubules
what is the importance of early bloomers in bulls? - Answer they have higher LH secretions
compared to later bloomers
what occurs from 0-5 weeks after being born for bulls? (think hormones) - Answer not much
GnRH, LH or testosterone present but an increasing responsivity of FSH secretion
what occurs from 6-15 weeks with the bull's hormones? - Answer - increasing frequency of
GnRH and LH
- FSH remaining at same levels
- low testosterone levels
- priming of Leydig and Sertoli cells
what occurs from 16-25 weeks of a bull's hormones? - Answer - GnRH, LH, and FSH levels
decrease
- testosterone remains low
- some growth of seminiferous tubules
-NO spermatogenesis yet
, what occurs from 26-45 weeks of the bull's hormones? - Answer - GnRH, LH, and FSH levels
increase
- testosterone levels increase dramatically
- proliferation and increased activity of Leydig and Sertoli cells
- big growth of seminiferous tubules
- spermatogenesis occurs here!
what occurs after 45 weeks of age? - Answer maturation of the reproductive tract
- especially 4 weeks after puberty
what decreases for most males when puberty is reached? - Answer - time to mount
- total number of mounts
- time to erection
- time to ejaculation
how do genetics influence puberty? - Answer - early maturing breeds reach puberty earlier
than others
- maternal breeds reach puberty earlier than paternal breeds (milk vs meat production)
- note that there are variations in species
how is nutrition important for puberty? - Answer - the hypothalamus can sense the nutritional
status of the animal
- it also senses leptin, glucose and FAs
- neurons will secrete GnRH to help the onset of puberty
tl;dr: better fed animals reach puberty faster than others
what is important with metabolites and puberty? - Answer as the animal grows, the body
develops along with the adipose tissue and muscles until an animal reaches a threshold for
puberty
why are social cues important in puberty? - Answer - pheromones are volatile chemical
compounds and are detected by olfactory senses
- some species are seasonal breeders
how can age of puberty affect an industry? - Answer the more of a population at the correct
age will increase supply for the industry
- especially industries that sell semen, embryos, etc.
Correct Answers.
what is dependent for puberty? - Answer - maturation of the reproductive tract and HPG axis
- genetics (species differences)
- environment (nutrition, health, social cues, and photoperiods)
how do we know if a male is fertile? - Answer 1) behavioral traits
2) first ejaculation
3) first ejaculation WITH spermatozoa
4) the ejaculate contains the correct threshold of sperm for fertilization
when is the male reproductive tract done forming? - Answer by day 125 in utero, everything
after is focused on maturing
what occurs when bulls are 25 WOA? - Answer the lumination process which is the significant
growth of the seminiferous tubules
what is the importance of early bloomers in bulls? - Answer they have higher LH secretions
compared to later bloomers
what occurs from 0-5 weeks after being born for bulls? (think hormones) - Answer not much
GnRH, LH or testosterone present but an increasing responsivity of FSH secretion
what occurs from 6-15 weeks with the bull's hormones? - Answer - increasing frequency of
GnRH and LH
- FSH remaining at same levels
- low testosterone levels
- priming of Leydig and Sertoli cells
what occurs from 16-25 weeks of a bull's hormones? - Answer - GnRH, LH, and FSH levels
decrease
- testosterone remains low
- some growth of seminiferous tubules
-NO spermatogenesis yet
, what occurs from 26-45 weeks of the bull's hormones? - Answer - GnRH, LH, and FSH levels
increase
- testosterone levels increase dramatically
- proliferation and increased activity of Leydig and Sertoli cells
- big growth of seminiferous tubules
- spermatogenesis occurs here!
what occurs after 45 weeks of age? - Answer maturation of the reproductive tract
- especially 4 weeks after puberty
what decreases for most males when puberty is reached? - Answer - time to mount
- total number of mounts
- time to erection
- time to ejaculation
how do genetics influence puberty? - Answer - early maturing breeds reach puberty earlier
than others
- maternal breeds reach puberty earlier than paternal breeds (milk vs meat production)
- note that there are variations in species
how is nutrition important for puberty? - Answer - the hypothalamus can sense the nutritional
status of the animal
- it also senses leptin, glucose and FAs
- neurons will secrete GnRH to help the onset of puberty
tl;dr: better fed animals reach puberty faster than others
what is important with metabolites and puberty? - Answer as the animal grows, the body
develops along with the adipose tissue and muscles until an animal reaches a threshold for
puberty
why are social cues important in puberty? - Answer - pheromones are volatile chemical
compounds and are detected by olfactory senses
- some species are seasonal breeders
how can age of puberty affect an industry? - Answer the more of a population at the correct
age will increase supply for the industry
- especially industries that sell semen, embryos, etc.
