Reproductive Management Flashcards
Gestation length
112 - 116 days (avg = 114 days)
3 months, 3 weeks, 3 days
Is there variability between gestational lengths in swine?
NO - not much variability at all!
Weaning to estrus interval
5-7 days
First estrus in gilts occurs:
6-8 months
Estrus cycle length
18-24 days (avg = 21 days)
Duration of estrus
2-3 days
Sows are anestrus during lactation. True or false.
True.
Lactation length
Variable - usually 14 - 28 days (2-4 weeks)
Estrus detection:
- Boar exposure
- Behavior of female - back pressure test
- Physical signs - reddened, swollen vulva
Can we freeze boar semen for AI?
No, but we can cool it for a max of a week
For mating, we want at least __ matings at ___ hour intervals during an estres (one service).
2 matings, 24 hour intervals
With natural mating, make sure there is a ______ floor surface.
Non-slip
Genetic sources - board - usually selected based on _____ quality. And ar eusually purchased from ______ suppliers.
Carcass; seedstock
Genetic sources - females - usually selected based on both _____ quality and _____ traits.
carcass, maternal
It is more economically advantageous to purchase breeding females from seedstock supplier, versus saving back replacement gilts from finisher. True or False.
True
Swine return to estrus ___ to ___ days post breeding.
18-24 days
If sow is bred twice in a 24 hour period of time, there is an ___% chance it will be successful.
80-85%
Best pregnancy diagnosis (98% accuracy):
does the sow return to estrus - 18-24 days post breeding
An ultrasound can be performed for a pregnancy diagnosis ___ to ___ days post breeding and has a ___ to ____ accuracy rate.
28-80 days
65-95%
To confirm a pregnancy diagnosis after you determine the sow has not returned to estrus, you can perform an _______.
ultrasound
Failure of the female to show estrus =
anestrus
A full bladder or a pyometra can cause false-_______ for pregnancy on ultrasounds.
positive
Boar infertility, poor timing of breeding, occlusion of hte oviduct and other anatomic abnormalities can lead to failure of ______.
Fertilization
Less than 4 viable emrbyos, infection, endometritis, and high enviornmental tempratures can cause ______ in respect to the embryo.
Early embryonic death (<12 days)
