LA1- Bovine Repro (Anatomy-Estrus Detection)
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what are the 3 functions of repro in bovines?
- genetic improvement
- freshening of dairy cattle
what is the most popular method of insemination?
what are the benefits of natural breeding?
*what is the major disadvantage to natural breeding?
- work load is decreased
- ***males are difficult to handle! (dairy especially)
cows are __ year round
how often do they cycle?
q 21 d.
how long is their standing heat?
why is heat detection so important?
because their heat is a short window for insemination
how long is their gestation?
how early do heifers start breeding?
when should heifers have their first calf?
Day 18/21 day cycle:
CL has developed after the previous ovulation
begins to __ and __ regress and __ concentrations decline
__ causes the signs of estrus and leads to the release of __ __ from the APG which starts ovulation
- luteinizing hormone
at the site of ovulation the new __ __ starts to grow and produces __
- corpus luteum
if the cow is not pregnant, __ will e released by the uterus and the __ will regress
GnRH causes the pituitary gland to secrete what?
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
PGF2a is what?
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?
Why is PGF2a used with caution?
- will cause abortion if animal is pregnant
- wear gloves absorbs into skin
Name 3 commercial prostaglandins:LLE
What is a FDA approved progesterone implant?
Signs of estrus:SMNVVIV
- standing to be mounted
- mounting other animals
- vulvar swelling
- increased urination
- vulvar discharge
Dection of estrus:OCMH
- mount detector aids
- heat detector aids
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