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therio final > Pigs > Flashcards

Pigs Flashcards

1
Q

What type of penis does the boar have?

A

Fibroelastic

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2
Q

What direction are testes oriented?

A

Caudally

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3
Q

What accessory sex gland does the boar NOT have?

A

Ampulla

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4
Q

Characteristics of sow repro tract

A

Bicornuate uterus
paired ovaries
red corpora lutea
long, twisted cervix

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5
Q

What is the average number of functional teats in sow?

A

14

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6
Q

What age is puberty in the boar?

A

9 motnsh

Crossbreds > purebreds

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7
Q

What penile structure breaks down during puberty?

A

frenulum

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8
Q

How is semen collected in boar?

A

“gloved hand method”

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9
Q

Ideal semen

A

> 65% motile
80% morphologically normal
100,000 sperm/mL

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10
Q

What environmental factor can affect semen quality?

A

Heat stress

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11
Q

What is the boar pheromone and what does it do?

A

5a-androstenone
Helps stimulate estrus in sows
Helps release GnRH and LH -> ovulation

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12
Q

When is puberty in gilt?

A

6-7 months

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13
Q

What is the “boar effect”?

A

Helps stimulate puberty in gilts via pheromones (fence line exposure or full physical contact)

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14
Q

Estrus length in sow

A

21 days

single follicular wave***

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15
Q

what is “flush feeding”?

A

Increasing feed intake a few days before estrus to increase the number of oocytes

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16
Q

Why cant you use PGF2a to synchronize estrus in sow?

A

Will not respond to PGF2a before day 12-13

17
Q

What test can be used to determine estrus in sow?

A

“Back pressure test”

18
Q

How long is estrus in sow?

A

2-3days

19
Q

Breeding methods

A 
Pen mating (one and many)
Hand breeding (one and one)
AI
20
Q

What is “uterine capacity”?

A

Uterus limits the number of embryos that survive

100% of oocytes are fertilized, but 30-40% will eventually die

21
Q

What does the sows pregnancy depend on?

A

CL

22
Q

How is PGF2a secreted in non-pregnant sow?

A

Endocrine

23
Q

How is PGF2a secreted in a pregnant sow?

A

Exocrine

24
Q

Gestation length

A

114 days (3 - 3 - 3)

25
Q

Placentation type

A

diffuse, epitheliochorial

26
Q

Pregnancy diagnosis

A

Failure to return to estrus
Rectal palpation
Ultrasonography

27
Q

What can be used to induce parturition?

A

PGF2a

Treat 1-2 days before

28
Q

When to wean piglets?

A

21-28 days (7kgs)

29
Q

Major reproductive diseases of pigs

A

PRRSV (Porcine Respiratory and Reproductive Syndrome Virus)

Parvovirus

30
Q

PRRSV

A

Porcine Respiratory and Reproductive Syndrome Virus
Losses in all stages of parturition
Aerosol and semen transmission

therio final (6 decks)

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