Breeding Management In Swine- FROM DRIVE

Question 1

Sows

Answer 1

Female pigs that have had piglets

Question 2

Gilts

Answer 2

Female pigs that haven’t had piglets

Question 3

Pig uterus

Answer 3

• bicornuate
• long horns
• short body

Question 4

Oocyte production

Answer 4

15-30 oocytes per estrus

Question 5

Puberty

Answer 5

150-220 days old

Question 6

First AI

Answer 6

2nd or 3rd estrus cycle

Question 7

Gestation

Answer 7

• 3 mos, 3 wks, 3 days (113-155 days)
• avg is 115 days

Question 8

Lactation anestrus

Answer 8

16-40 days

Question 9

Weaning to estrus

Answer 9

4-6 days

Question 10

Estrous cycle

Answer 10

18-24 days

Question 11

Estrous phase

Answer 11

4-6 days

Question 12

Luteal phase

Answer 12

15 days

Question 13

Time from estrous to ovulation

Answer 13

36-44 hrs

Question 14

Duration of estrous w/o boar

Answer 14

<24 hrs to >96 hrs

Question 15

Duration of estrous in presence of boar

Answer 15

40-60 hours

Question 16

Placentation type

Answer 16

Epitheliochorial

Question 17

Follicular phase events

Answer 17

• estrogen increases as oocyte & follicle mature to ovulation

Question 18

Proestrus events

Answer 18

• E2 and FSH increase to prep for estrus
• some LH released

Question 19

Estrus events

Answer 19

• oocyte is mature
• E2, FSH,& LH increase -> rupture of follicle & ovulation

Question 20

Luteal phase events

Answer 20

• progesterone increases due to CL development

Question 21

Metestrus events

Answer 21

• E2, LH, & FSH decrease
• female isn’t receptive to male
• follicles begin luteinization -> corpus hemorrhagicum -> CL
• CL secretes progesterone

Question 22

Diesstrus events

Answer 22

• longest stage of estrous cycle
• progesterone increases around day 12-15
• if no oocyte detected by day 15 -> PGF2a causes C to regress and reduce progesterone secretion

Question 23

If a pig is mounting a pig that is in heat, then…

Answer 23

It is coming into heat

Question 24

If a pig is standing and allowing you to do whatever you want, then…

Answer 24

It is in heat

Question 25

Standing heat

Answer 25

• 12 hrs after 1st AI
• 12 hrs after 2nd AI
• Ovulation & fertilization

Question 26

How does suckling suppress LH

Answer 26

Inhibits GnRH from hypothalamus which prevents follicular wave from being produced

Question 27

Days to allow uterus to involute

Answer 27

21-28

Question 28

Weaning piglets too early can cause

Answer 28

• decreased FSH and LH -> follicular cyst development

Question 29

Follicular cysts

Answer 29

Follicles grow, no ovulation bc LH too low

Question 30

Hormone that stimulates ovulation

Answer 30

HCG

Question 31

PG 600 (400 IU eCG & 200 IU hCG)

Answer 31

• Induces puberty
• come into estrus 7 days post-inject.

Question 32

Altrenogest (Matrix)

Answer 32

• synchronizes estrus
• inhibits follicular growth until removed from circulation, then all follicles grow & ovulate @ same time