Dairy Cow Reproductive Management 2 Flashcards
What does a cows lactation curve look like?
Upside down nike swoosh
When is peak milk production in a dairy cow?
60 DIM
When do we want to get a cow pregnant?
When do we need to get her pregnant?
60-90DIM
90-150DIM
How does low reproductive efficiency affect profitability?
- Long Calving interval means less milk and less calves
-Increased culling due to repro failure = less genetic progress, increased replacement cost and less heifer to market
-Low conception rate = increase semen cost and vet bills
-Low production or dry period = fat cow with reptro and health issuees
How can farmers get a cow pregnant?
All AI, AI and Bull, All bull
What are the only 4 components to days open?
- VWP
- Heat Detection
- Conception Rate
- Cull Rate
Definition of Days Open
Number of days from freshening till a cow becomes pregnant
Calving Interval Definition
Calving interval is days open plus gestational length
What is the voluntary waiting period?
60 days - time from freshening till breeding
Time needed for uterine involution
Effected by weight loss and periparturient disease
When should all cows be inseminated by?
100 DIM
When should cows be bred for the 1st time?
No TAI breed asap after the VWP
Using TAI 70-90 DIM
What are some factors that affect heat detection rate?
Technique, breeding program, incidence of anestrus, stocking rate, environment, foot care, facilities, people and process
What effects how often and long a cow comes into heat?
Her Breed or how much milk she is producing
What are some heat detection systems?
Tail stripe system, Karmar heatmount, bovine beacon, estrus alert, pedometer, neck activity meters (3x increase in activity), heatwatch computer software, accelerometer
Heat detection Efficiency vs accuracy?
Efficiency: percent of cows out of the total you find in heat
Accuracy: percent of the cows you found in heat that were actually in heat and ready to be bred
If there was an issue with heat detection on one of your dairies how would you know it? What parameter?
Accuracy would go down, pregnancy rates be down, % successful conception rate goes down
How do you help a farmer improve heat detection?
put more effort in and time watching the animals (30min morning and night), use synch drugs (And technology) and use a bull to help
Try not to offend them
What is the % successful conception rate?
% of Breedings that result in pregnancy
What is pregnancy rate?
Percent of cows eligible to become pregnency in a given time frame that actually do become pregnant (21 days usually)
If pregnancy rate increases the calving interval…
decreases
What is the average PR for 21 days?
16.2%
What are the 2 ways to improve pregnancy rate?
Conception rate (improve fertility)
Heat Detection (Service rate)
At what days of milk are most animals culled?
1st 30 days and 300+ days
What goes into building a herd health program?
Goals, past problems, do able solutions and monitoring
What do dairy’s use GNRH for?
Treat cystic ovarian disease, synch follicular waves
Cystorellian, Factorel, Fertygel
What do dairies use prostaglandin for?
Lyse Cl, treat pyometra, abort cow <150 days, uterine evacuant,
Lutalyse or estrumate
