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Theriogenology > Pig Reproduction > Flashcards

Flashcards in Pig Reproduction Deck (107)
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1

What type of breeding is practiced widely in swine?

Cross breeding

2

Using breeds or lines to take maximum advantage of their genetic type is know as what?

Breed complementation

3

The tendency for cross-bred progeny to perform differently than the average of their parents is known as what?

Heterosis or Hybrid vigor

4

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

5

What are 4 problems that can be seen with the external genitalia of pigs?

- Infantilism
- Dorsally tipped vulva
- Male pseudohermaphroditism
- Mammary gland abnormalities

6

A pig with a small reproductive tract has what condition?

Infantilism

7

Pigs with a dorsally tipped vulva may have difficulty with what?

Mating

8

Male pseudohermaphroditism can lead to what type of vulva?

"Fishhook" or "sky-tipped" vulva

9

How many piglets do we want a sow to have?

10

10

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

11

Hydrosalpinx or pyosalpinx can lead to what?

Obstruction of oviducts

12

What can segmental aplasia lead to?

Complete or partial infertility

13

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

14

How many teats should be cranial to the umbilicus on each side?

3

15

How do the sows uterine horns appear?

Long and tortuous

16

What is the average age a pig goes into puberty?

5-8 months

17

What is the average weight at which a pig goes into puberty?

200-250 lbs

18

What breed of pig can reach puberty as early as 67 days?

Meishan

19

What breed of pig can reach puberty at 173 days of age?

Landrace

20

Which reach puberty earlier, purebreds or crossbreds?

Crossbred

21

Which breed is the latest to reach puberty?
When do they usually reach it?

- Duroc
- 224 days

22

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

23

What are 3 possible factors for hastening the onset of puberty?

- Movement/mixing of females
- Length of day (long)
- Boar effect

24

What are 2 factors that can delay the onset of puberty?

- Confinement housing
- Season

25

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

26

Does the mixing of gilts and sows delay or hasten the onset of puberty?

Hastens the onset of puberty

27

What is the most common method used to hasten the onset of puberty in females?

Boar effect

28

What type of boar should be used for the "boar effect?"

Mature "smelly" boar

29

At what age is a gilt exposed to the "boar effect?"

Begin at 160-170 days of age

30

What type of contact should be used with the boar effect?

Continous direct contact