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LA1- Bovine Repro (Anatomy-Estrus Detection)
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what are the 3 functions of repro in bovines?
SGF
stock
genetic improvement
freshening of dairy cattle
what is the most popular method of insemination?
AI
what are the benefits of natural breeding?
RW
*what is the major disadvantage to natural breeding?
reliable
work load is decreased
***males are difficult to handle! (dairy especially)
cows are __ year round
polyestrus
how often do they cycle?
q 21 d.
how long is their standing heat?
24-48 hours
why is heat detection so important?
because their heat is a short window for insemination
how long is their gestation?
9mo.
how early do heifers start breeding?
15 mo
when should heifers have their first calf?
2 years
Day 18/21 day cycle:
CL has developed after the previous ovulation
begins to __ and __ regress and __ concentrations decline
progesterone
__ causes the signs of estrus and leads to the release of __ __ from the APG which starts ovulation
estrogen
luteinizing hormone
at the site of ovulation the new __ __ starts to grow and produces __
corpus luteum
progesterone
if the cow is not pregnant, __ will e released by the uterus and the __ will regress
prostaglandins
CL
GnRH causes the pituitary gland to secrete what?
LH
FSH
GnRH causes what?
ovulation of dominate follicle of all treated animals
GnRH can be used in the tx of what dz?
cystic ovarian dz
Name 2 examples of commercial GnRH:CF
Cystorellin
Factrel
PGF2a is what?
prostaglandin
What does prostaglandin cause?
regression/lysing of CL
PGF2a _ progesterone and allows new _ to grow.
decreases progesterone
new follicles
Prostaglandin is used in the tx of what?
uterine infx
Why is PGF2a used with caution?
will cause abortion if animal is pregnant
wear gloves absorbs into skin
Name 3 commercial prostaglandins:LLE
Lutalyse
Lutaluze
Estrumate
What is a FDA approved progesterone implant?
EAZI-BREED CIDR
Signs of estrus:SMNVVIV
standing to be mounted
mounting other animals
nervousness
vocalization
vulvar swelling
increased urination
vulvar discharge
Dection of estrus:OCMH
observation
charts/calandar
mount detector aids
heat detector aids
Author
heather.dundas
ID
238247
Card Set
LA1- Bovine Repro (Anatomy-Estrus Detection)
Description
vti
Updated
10/2/2013, 1:15:53 AM
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