Dairy Reproductive Management Flashcards
What occurs during the voluntary waiting period?
Period after calving where the uterus involutes and she gets ready to cycle again
-day 0-60
When do you want to get cows pregnant vs when do you need to get them pregnant?
Want to get them pregnant from days 60-90, need to get them pregnant before day 150 DIM
-after this point, will milk them out and sell them
What are the two things that pregnancy guarantees?
Future milk and future replacement
What is the main issue with a cow getting pregnant over 150 days in milk?
Lack of maximum production
-but more importantly her dry period will be longer, leading to higher BCS and increased risk of fatty liver disease and other disease
Why is finding the cow in heat no longer a requirement?
Due to timed AI protocols
With timed AI, what is the best conception rate you can hope for on first service?
40-50%
Where is the one place the equine world beats cows in terms of repro?
They can detect pregnancy before the following estrus cycle
What is the simplest method of heat detection?
Tail stripe system
- cheap and high efficiency
-disadvantage is that you are looking for a negative (all cows need chalk including those that are already pregnant)
What is the most common heat detection aid?
Estrus alert- works like lottery tickets
- costs 1$
- can turn with tail swiping (due to flies)
Describe some of the other estrus detection aids
Kamar heat detectors: contain small vial of dye with a pen hole inside a larger indicator. When cow is mounted the dye escapes from vial and turns indicator red. Cost 1$, but there is a potential for maybe results
Bovine beacon: 2 glass vials inside indicator. When cow is mounted the glass vials break mixing the liquids. Indicator turns orange and glows in the dark for 12 hours. Costs 1.75, fluoresces and lasts a while, but often can break without mounting
What has the world of estrus detection turned to in the last 20 years?
Activity meters: pedometers and neck activity meters
- cows activity goes up around 200-300% during estrus
What is the most common sequele to cystic ovarian disease?
Anestrus
What are some confounding factors that can affect pedometer readings?
-lame cows with pedometers move less
- lame cows with neck activity meters move more (neck bobs)
Why did the heat watch system fall out of favor?
Maintenance was awful
- even though it provided the best heat detection
Compare and contrast heat detection efficiency and accuracy
Efficiency: how good you are at finding heats
-the amount of cows you call in heat/number actually in heat
Accuracy: are the cows you call actually in heat
- the cows actually in heat of those you call/amount you call
