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RUSVM Theriogenology 2017 > Swine Repro > Flashcards

Flashcards in Swine Repro Deck (107)
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1

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

2

How many pigs should be weaned per year?

19-20

3

What is the goal number of Piglets born per year?

10-12

4

What problems with external genitalia should you look for in selecting replacements in pigs?

Infantalism
Dorsally tipped vulva
Male pseudohermaphroditism
Mammary gland abnormalities

5

Infantalism

Small repro tract

6

Describe Male Pseudohermaphroditism

"Fishhook" or "sky tipped" vulva

7

What problems with internal genitalia should you look for in selecting replacements in pigs?

Hydrosaplinx or Pyosalpinx
Segmental Aplasia
Blind or missing cervix
Oviductal adhesions

8

What is the problem with Hydrosalpinx/Pyosalpinx in pigs?

Adhesions formed that cause obstruction of the oviducts

9

Describe the Mammary system in replacement sows

Six functional teats on each side
three cranial to umbilicus
At least 10 functional teats

10

What are some problems with the mammary glands of replacement sows?

Pin nipples
Blind teats
inverted nipples
Abscesses
injures

11

What are the factors affecting puberty in pigs?

5-8 months of age
200-250lbs
Breed

12

What hastens the onset of puberty in pigs?

Movement/mixing of females
Long days (16-18h)
Boar effect

13

What delays the onset of puberty in pigs?

Confinement housing
Season

14

Boar effect

most common method used to manipulate puberty
Continuous exposure to a smelly boar beginning at 160-170 days of age

15

What is the most common method used to manipulate puberty in pigs?

Boar effect

16

Describe the estrous cycle in pigs

Polyestrous
Non-seasonal
21 day cycle

17

How long is estrus in Gilts?

36-48 hours

18

How long is estrus in sows?

48-72 hours

19

When does ovulation occur in pigs?

2/3 of the way through estrus
24 hours after LH peak

20

When is the ovulation rate the largest in the pig?

over the first 3 parities

21

Parities

a farrowing (giving birth)

22

Signs of Estrus in pigs

Vulva swelling and redness
Vaginal discharge
Restlessness and vocalization
Actively seeking boar
"Pricking" or ears
Lordosis response "back pressure test"

23

When should you check estrus in pigs?

twice a day

24

How do you detect estrus in pigs?

Change boars to prevent familiarization
Avoid prolonged exposure to boars
Avoid ventilation
Use a "stink stick" or "Boar mate"

25

What is the strategy for weaning in pigs?

All in/All out

26

When does estrus occur post weaning?

4-7 days

27

How do you induce/ synchronize estrus in non-cycling gilts?

PG600 (PMSG + HCG)
Greater than 165 days of age

28

What effects does PMSG (Pregnant Mare Serum Gonadotropin) have?

FSH like effects

29

What effects does HCG (Human Chorionic Gonadotropin) have?

LH like effects

30

What synthetic progestogens can be fed to pigs to induce estrus?

Altrenogest