Porcine Flashcards
What pattern is the cervix
interdigitating prominences (spiral like)
T/F: the cervial structures require an adapted penis/AI catheter to be traversed
T
What is the avg size of ovulatory follicles
8-12mm
___ is produced by the ovary and contributes to estrous behavior and morphological changes to the uterus
estradiol
What type of cycle/breeding do sows demonstrate
nonseasonal polyestrus
What is the avg length of a sows estrus cycle
21 days
When is the 1st attempt at AI conducted?
the sows 2nd or 3rd heat
How long is gestation
3mo 3wks 3 days (113-115 days)
T/F: lactation/nursing has no effect on the estrus cycle
false, nursing sows experiences anestrus
What is the average weaning to return to estrus period
4days
How many oocytes on avg are ovulated with each estrus cycle
15-30
How long does diestrus/the CL last?
14days
When does the CL respond to prostaglandin?
only after day 11-12
T/F: the sow has a long proestrus
true
How long is a sows proestrus period
4 days
what is the avg length of an estrus period
1-4 days
When does ovulation happen/when should you attempt AI
on the 2nd day of estrus (36-44 hours after onset)
When is gilt puberty onset?
~6mo
When is the first breed of a gilt?
~7mo
What are 3 unique things to a boars anatomy compared to other large animals
there is no ampulla
corkscrew glans
preputial diverticulum
What is the avg vol of ejaculate
100-300mls
When does the embryo enter the uterus
day 3
When does the embryo migrate/spread out across the horn after entering the uterus
day 7
What day does maternal recognition occur
day 11-12
what is unique to sow maternal recognition of pregnancy
the embryo produces estradiol
estradiol reroutes PGF2alpha to uterine lumen
the PGF2alpha is destroyed in the lumen and cannot enter circulation to reach the ovary and cause lutinization of the ovary
T/F: sow pregnancy is CL depended
T
What type of placenta does the sow have?
diffuse epitheliochorial
How long does stage 2 of parturition usually last?
1-6 hours
T/F: stillbirths are common but mummies are pathogenic
false, both can be normal
What is the breeding goal of sows
2 litters/year/sow
When would you rebreed a postpartum sow
at the 1st postweaning estrus ~4wks
