Lecture 4: Reproduction Flashcards
(20 cards)
How does too frequent use in breeding or semen collection affect semen quality?
there can be immature sperm,
How does infrequent use or long periods between uses affect semen quality?
after a long period of time may find old sperm in ejaculation which is less fertile than young sperm
Why do sperm cells generally have to be deposited into the female reproductive tract before ovulation =?
because before the sperm becomes fertile it has to be capacitated which occurs in the female tract
List the 4 functions of epididymis and relate theses functions to the timing of an animals possible infertility due to heat stress
- transports sperm from seminiferous tubules to vas deferens
- concentrate sperm
- maturation of sperm
- storage of sperm
- heat stress causes temporary loss of fertility, it also decreases semen quality and motility, takes a while to affect semen because it takes a while for the semen to go through the epididymis.
what are the function of seminiferous tubules?
where spermatogenesis occurs
What is the function of leydig cells
produce testosterone
what is the function of vas deferens?
Transports sperm from urethra from epididymis
What is capacitation and where does it occur?
Capacitation is when the spermatoza undergoes a change which results in it being fertile, occurs in the female reproductive tract.
What does the luteining hormone do?
it stimulates testeosterone
What does follicile stimulant hormone do?
it stimulates sperm production
what does prolactin do?
it stimulated the secondary sex organs.
What factors influence breeding quality/success?
- Age(younger animal will produce better quality sperm)
- Nutrition (on a better nutrition plane will allowfor the animal to produce better quality of sperm)
- High tempatures ( high tempatures causes temporary loss in fertility)
- Frequency of use (used often will cause immature sperm to be used)
What is cryptorchid?
aniamls testes that has not dropped yet, makes him infertile because sperm is being produce at body temp
What is cremaster/tunica dartos muscles?
the used to lower and raise the scrotum when the animal is experience cool or warm tempatures.
what are vascular glands used for?
contributes fluid, buffer, and nutrients to ejaculate
what are prostate glands used for?
small amount of fluid
what are bulbourethral glands used for?
- for bulls, it flushes the leftover urine that is in urethra before ejaculation
- for boars prevents semen from flowing back into the cervix
How long does the sperm remain fertile in a
cow
mare
poultry
- 1-2 days
- 6 days
- 30 -40 days
What are the functions of testosterone?
increases spermatogenesis
increases muscle synthesis
sex drive(libido)
when is the first time good sperm is ejaculated from stallion bull ram boar
13-18 months
10-12 months
4-6 months
4-8 months
