Breeding Mgmt In Swine- Ppt

Question 1

oocytes per estrus

Answer 1

15 to 30

Question 2

Gilts reach puberty at

Answer 2

150 to 220 days old

Question 3

4 factors that influence puberty onset

Answer 3

• nutrition
• season/lighting
• confinement
• boar exposure

Question 4

Exposing boars to females causes increases in…

Answer 4

GnRh, LH and E2

Question 5

What age should you expose gilts to boars

Answer 5

150-170 days

Question 6

How long should boars be exposed to gilts

Answer 6

5 to 30 mins/day

Question 7

____ contact is recommended between gilts and boars

Answer 7

Physical

Question 8

What causes greater response to boar exposure

Answer 8

Combining w/ transportation stress @ 160 days

Question 9

Best way to stimulate 1st heat

Answer 9

Combining boar exposure with transportation stress

Question 10

Boar exposure and PG600 causes

Answer 10

More animals coming into heat 5-10 days after tx

(Can’t synchronize cycle)

Question 11

During what cycle do you perform 1st AI

Answer 11

2nd or 3rd cycle

Question 12

Pregnancy length

Answer 12

113-115 days (3 mos, 3 wks, 3 days)

Question 13

Lactation anestrus

Answer 13

16-40 days in lactation

Question 14

Weaning to estrus interval

Answer 14

4-6 days

Question 15

Why are pigs rarely bred naturally?

Answer 15

Their body wt is too heavy

Question 16

Estrous cycle length

Answer 16

18-24 days

Question 17

Sows have ___ estrous cycles compared to gilts

Answer 17

Shorter

Question 18

Estrous phase length

Answer 18

4-6 days

Question 19

Luteal phase length

Answer 19

15 days

Question 20

Estrus signs

Answer 20

• standing heat
• 6-12 mm follicles

Question 21

Duration of estrus

Answer 21

• in presence of boar: 40-60 hrs
• varies <24 hrs to >96hrs in individual sows

Question 22

Ovulation length

Answer 22

41-47 hrs after LH surge

Question 23

Duration of estrus is varied by

Answer 23

• intensity of boar contact
• stress
• parity (shorter in gilts)
• weaning to estrous interval

Question 24

Diestrus events

Answer 24

• CL reach final size a week after ovulation
• development of CL and P4 prod. Is independent from LH prod. Until 10-12 days
• PGF2a causes luteolysis at 15 days but CL responsive @ 12 days

Question 25

Lactational anestrus

Answer 25

- LH suppressed bc of suckling induced inhibition of GnRH

Question 26

Degree of LH suppression is related to

Answer 26

- suckling intensity - negative energy balance of sow - stress

Question 27

Fertility improvement post weaningg

Answer 27

- pst weaning follicle regression: via progesterone analogue for at least 4 days or inseminating sows @ second estrous post-weaning

Question 28

eCG

Answer 28

- Good of estrous and ovulation induction - not available in US

Question 29

hCG

Answer 29

Stimulate ovulation (not estrus)

Question 30

PG 600 (400 eCG & 200 hCG)

Answer 30

- Induces puberty in gilts (must be at least 185 lbs and 5 mos old) - >55% gilts in estrus within 7 days of injection - >90% gilts ovulate w/ 12-15 follicles

Question 31

Altrenogest (Matrix)

Answer 31

- synchronizes estrus in pubertaal cyclic females - must be fed for at least 14 days - fed individually

Question 32

Triptorelin gel

Answer 32

- GnRH agonist - give @ level of cervix & 22 hrs post AI

Question 33

Estrous synch in prepubertal gilts

Answer 33

- PG600 - Boar exposure - travel - combination of above tx

Question 34

Pubertal and cyclic gilt estrous synch

Answer 34

- progesterone - PG600 - GnRH or hCG - triptorelin

Question 35

Weaned sows estrous synchronization

Answer 35

- based on weaning time - check for heat 4-6 days post weaning - triptorelin

Question 36

2 sites to inseminate female

Answer 36

Cervix and uterine horn