Exam 2 estrus synchronization quiz
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28 Terms
What is the average length of the estrous cycle?
21 days
What is the range of length of the estrous cycle
17-24 days
On avg how long will a cow stand when in estrus
12 hrs
Is it more difficult to detect heat in Bos Indicus or Bos Tauruas?
Bos Indicus
When does ovulation occur?
31 hours after the onset of standing heat
Is lutalyse a progestin or prostaglandin?
Prostaglandin
Is Cystorelin a GnRH?
yes
After being used for 7 days cleaned and stored in a dry area can a CIDR be reused?
yes
After being used for 14 days cleaned and stored in a dry area can a CIDR be reused?
no
What hormone is responsible for inducing ovulation?
GnRH
What hormone is released by the CL and suppresses estrus and ovulation?
Progesterone
GnRH is released by the hypothalamus and targets what?
anterior pituitary gland
What term is used to describe the destruction of the corpus luteum?
Luteolysis
Can a cow have 2 or 3 follicular waves per estrous cycle?
yes
Can a pre-pubertal heifer have follicular waves?
yes
How young can you IVF aspirate a heifer?
At birth
What does an injection of GnRH do?
restarts a new follicular wave
What dose a combination injection of estradiol and progesterone do?
restarts a new follicular wave
Is a cow thats demonstrating estrus always ovulating?
no
When synchronizing estrus what is used to induce the corpus luteum regression
prostaglandins
What is the downside to using progestins to sync estrus?
they can cause persistent follicles that can reduce fertility
Is MGA approved for cows?
no, only virgin heifers
Can estrus be effectively synchronized in cow immediately after giving birth?
no
How long is an oocyte viable for?
8 hours
How long are sperm in the female tract before they can fertilize?
8-12 hrs
What is the am pm rule
a cow should receive AI 12 hours after first being observed in estrus. If a cow is seen in estrus in the AM she should receive AI that PM, and cows seen in estrus in the PM should receive AI the following AM
Does the age of the egg effect the quality of the embryo?
yes
what does the age of the semen effect?
conception rates
