Flashcards in Pig Reproduction Deck (107)
What type of breeding is practiced widely in swine?
Using breeds or lines to take maximum advantage of their genetic type is know as what?
The tendency for cross-bred progeny to perform differently than the average of their parents is known as what?
Heterosis or Hybrid vigor
What are 2 aspects of structural soundness to be considered when selecting replacements?
- General structural soundness
- Signs of: injuries, hoof cracks, sole bruises, foot rot
What are 4 problems that can be seen with the external genitalia of pigs?
- Dorsally tipped vulva
- Male pseudohermaphroditism
- Mammary gland abnormalities
A pig with a small reproductive tract has what condition?
Pigs with a dorsally tipped vulva may have difficulty with what?
Male pseudohermaphroditism can lead to what type of vulva?
"Fishhook" or "sky-tipped" vulva
How many piglets do we want a sow to have?
What are 4 problems that can be seen with the internal genitalia in pigs?
- Hydrosalpinx or pyosalpinx
- Segmental aplasia
- Blind or missing cervix
- Oviductal adhesions
Hydrosalpinx or pyosalpinx can lead to what?
Obstruction of oviducts
What can segmental aplasia lead to?
Complete or partial infertility
How many functional teats should ideally be on each side of the sow?
What is the minimum total number of functional teats a sow should have?
- 6 on each side
- At least 10 functional teats
How many teats should be cranial to the umbilicus on each side?
How do the sows uterine horns appear?
Long and tortuous
What is the average age a pig goes into puberty?
What is the average weight at which a pig goes into puberty?
What breed of pig can reach puberty as early as 67 days?
What breed of pig can reach puberty at 173 days of age?
Which reach puberty earlier, purebreds or crossbreds?
Which breed is the latest to reach puberty?
When do they usually reach it?
- 224 days
What are 4 goals to managing a gilt pool?
- Keep large enough gilt pool to meet weekly breeding targets
- Daily boar exposure will stimulate puberty
- Gilt in heat: use sterile boar 1st heat then fertile boar 2nd heat
- Aim for large litter size and good nursing ability in gilts
What are 3 possible factors for hastening the onset of puberty?
- Movement/mixing of females
- Length of day (long)
- Boar effect
What are 2 factors that can delay the onset of puberty?
- Confinement housing
What are 2 ways lighting can affect the reproductive cycle in pigs?
- Long day length (16-18 hours) reduces age at puberty
- Detrimental to cycling females
Does the mixing of gilts and sows delay or hasten the onset of puberty?
Hastens the onset of puberty
What is the most common method used to hasten the onset of puberty in females?
What type of boar should be used for the "boar effect?"
Mature "smelly" boar
At what age is a gilt exposed to the "boar effect?"
Begin at 160-170 days of age