Flashcards in Swine Repro Deck (107)
What is the goal of cross breeding for swine repro?
Heterosis or Hybrid vigor
using breeds or lines to take max advantage of their genetic type
How many pigs should be weaned per year?
What is the goal number of Piglets born per year?
What problems with external genitalia should you look for in selecting replacements in pigs?
Dorsally tipped vulva
Mammary gland abnormalities
Small repro tract
Describe Male Pseudohermaphroditism
"Fishhook" or "sky tipped" vulva
What problems with internal genitalia should you look for in selecting replacements in pigs?
Hydrosaplinx or Pyosalpinx
Blind or missing cervix
What is the problem with Hydrosalpinx/Pyosalpinx in pigs?
Adhesions formed that cause obstruction of the oviducts
Describe the Mammary system in replacement sows
Six functional teats on each side
three cranial to umbilicus
At least 10 functional teats
What are some problems with the mammary glands of replacement sows?
What are the factors affecting puberty in pigs?
5-8 months of age
What hastens the onset of puberty in pigs?
Movement/mixing of females
Long days (16-18h)
What delays the onset of puberty in pigs?
most common method used to manipulate puberty
Continuous exposure to a smelly boar beginning at 160-170 days of age
What is the most common method used to manipulate puberty in pigs?
Describe the estrous cycle in pigs
21 day cycle
How long is estrus in Gilts?
How long is estrus in sows?
When does ovulation occur in pigs?
2/3 of the way through estrus
24 hours after LH peak
When is the ovulation rate the largest in the pig?
over the first 3 parities
a farrowing (giving birth)
Signs of Estrus in pigs
Vulva swelling and redness
Restlessness and vocalization
Actively seeking boar
"Pricking" or ears
Lordosis response "back pressure test"
When should you check estrus in pigs?
twice a day
How do you detect estrus in pigs?
Change boars to prevent familiarization
Avoid prolonged exposure to boars
Use a "stink stick" or "Boar mate"
What is the strategy for weaning in pigs?
All in/All out
When does estrus occur post weaning?
How do you induce/ synchronize estrus in non-cycling gilts?
PG600 (PMSG + HCG)
Greater than 165 days of age
What effects does PMSG (Pregnant Mare Serum Gonadotropin) have?
FSH like effects
What effects does HCG (Human Chorionic Gonadotropin) have?
LH like effects