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RUSVM Theriogenology 2017 > Bovine Repro > Flashcards

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

Krey Hook

used to grab the jaw bone
used for mostly grabbing parts of the calf when you perform a fetotomy