Canine Breeding Management Flashcards
What is the first stepping stone in breeding management in canines?
Identify 1st day of vulvar discharge and start counting until day 18.
What is the second stepping stone in breeding management in canines?
Start 3-4 days after proestrus starts or when vaginal cornification (superficial cells) make up 50% of the cells to perform diagnostic blood work.
What is the third stepping stone in breeding management of canines?
Identify 1st day of standing estrus (Day 9)
When does LH peak in the dog?
24-48 hours into estrus
What causes the LH peak in dogs?
Estrogen peak during proestrus
Does LH have a short or long peak duration in dogs?
Very short peak duration
How often should LH be assayed in order to detect the peak rise in dogs?
Daily
When does ovulation occur in the dog?
When is this in relation to estrus?
- 24-48 hours after the LH surge
- Day 3-4 of estrus
About how long does ovulation take to complete in the dog?
About 24 hours
What is ovulated in the dog?
Primary oocyte (2N)
What has to occur after ovulation in a dog in order for fertilization to occur?
Primary oocyte (2N) must go through further meiotic division to a secondary oocyte (1N)
How long does it take for a primary oocyte to divide to a secondary oocyte in the dog?
2-3 days
How long is the secondary oocyte viable for in the dog?
3-4 days
What is the modern standard for breeding management used for assessing when to breed in the dog?
Progesterone (P4)
When should progesterone samples be taken in the dog?
Every other day (M-W-F)
An initial rise in P4 coincides with what?
LH peak
A progesterone level of what coincides with the LH peak?
2 ng/mL
A progesterone level of what coincides with ovulation starting?
5 ng/mL
Ovulation can be confirmed when progesterone is at what level?
Greater than 15 ng/mL
What happens to progesterone levels post-ovulation?
Become elevated and stay elevated
A rise in progesterone of 3 ng/mL in 24 hours coincides with what event?
Ovulation
Failure to confirm ovulation can lead to what 3 results?
- Conception failure
- Small litter
- Inaccurate due date determination
When should a dog be bred after P4 levels have reached 5 ng indicating ovulation if dealing with natural or shipped semen?
48-96 hours later
If using frozen semen, when should a dog be bred after P4 levels reach 5 ng?
72 hours