Pigs Flashcards
What type of penis does the boar have?
Fibroelastic
What direction are testes oriented?
Caudally
What accessory sex gland does the boar NOT have?
Ampulla
Characteristics of sow repro tract
Bicornuate uterus
paired ovaries
red corpora lutea
long, twisted cervix
What is the average number of functional teats in sow?
14
What age is puberty in the boar?
9 motnsh
Crossbreds > purebreds
What penile structure breaks down during puberty?
frenulum
How is semen collected in boar?
“gloved hand method”
Ideal semen
> 65% motile
80% morphologically normal
100,000 sperm/mL
What environmental factor can affect semen quality?
Heat stress
What is the boar pheromone and what does it do?
5a-androstenone
Helps stimulate estrus in sows
Helps release GnRH and LH -> ovulation
When is puberty in gilt?
6-7 months
What is the “boar effect”?
Helps stimulate puberty in gilts via pheromones (fence line exposure or full physical contact)
Estrus length in sow
21 days
single follicular wave***
what is “flush feeding”?
Increasing feed intake a few days before estrus to increase the number of oocytes
Why cant you use PGF2a to synchronize estrus in sow?
Will not respond to PGF2a before day 12-13
What test can be used to determine estrus in sow?
“Back pressure test”
How long is estrus in sow?
2-3days
Breeding methods
Pen mating (one and many) Hand breeding (one and one) AI
What is “uterine capacity”?
Uterus limits the number of embryos that survive
100% of oocytes are fertilized, but 30-40% will eventually die
What does the sows pregnancy depend on?
CL
How is PGF2a secreted in non-pregnant sow?
Endocrine
How is PGF2a secreted in a pregnant sow?
Exocrine
Gestation length
114 days (3 - 3 - 3)
