Flashcards in Bovine Repro Deck (163)
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1
When do you see puberty in the bovine?
when heifer reaches 50-60% adult body weight
2
What influences when a heifer reaches puberty?
Inbreed later onset
Cross-breeds sooner onset
Bos Taurus earlier than Bos indicus
Heifers from bulls large scrotal circumference
3
What are the stages of the Bovine estrus cycle?
Estrus
Metestrus
Diestrus
Proestrus
4
How many days are there in the Metestrus cycle of the Bovine?
1-4 days
5
How many days are there in the Diestrus cycle of the Bovine?
5-18 days
6
Estrus
sexual receptivity of female
Follicular maturation
7
What are the signs of Estrus in the bovine?
Increased restlessness
Decreased rumination
Decreased Appetite
Decreased milk
Bellowing
8
Metestrus
Final follicular maturation
Ovulation
Formation of CL
9
Diestrus
Period of CL dominance through luteolysis
10
Proestrus
Progesterone levels decreasing
Estrogen levels increasing
11
At what age are heifers bred in the dairy herd?
14-15 months
12
Voluntary Waiting Period
The period we allow for the uterus to involute and read for pregnancy
13
How long is the VWP?
60 days
14
Dry off
60 days to allow the mammary glands to rest before calving to ensure peak lactation after calving
15
What are the advantages of synchronization?
Reduce the window of time when insemination is appropriate
Reduce the time spent in estrus detection
enhance estrus detection
Allow scheduling of breeding/inseminations
provide for synchrony essential to most embryo transfer programs
16
What re the general principles of estrus control and synch?
shorten the luteal phase
lengthen the luteal phase
17
Lutalyse or Estrumate
causes regression of the CL
Estrus displayed in 2-5 days
18
What is the feed through product that can be used to synchronize cattle?
MGA
19
How does the CIDR work?
extends the Diestrus phase
20
Why do you use GnRH with the CIDR?
induced a synchronous emergence of a new follicular wave
21
What should you examine when examining the fetus?
Presentation
Position
Posture
22
How do you assess that the fetus is alive?
position response to pedal, palpebral, eye ball, mouth, and anal pressure by movement reflex
23
What does meconium suggest about the calf?
stressed calf
24
What does fetid odor suggest about the calf?
dead calf
25
Mutation
process by which fetus is restored to deliverable fashion
26
Repulsion
Pushing the fetus out of maternal pelvis into the uterine cavity to enable correction of abnormality
27
Rotation
Turning the fetus on its longitudinal axis
28
Version
Turning the fetus on its transverse axis into a cranial or caudal presentation
29
Eye hooks
placed into the medial canthus to help turn the head into the right position
30
