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Theriogenology > Breeding Management In Swine- FROM DRIVE > Flashcards

Breeding Management In Swine- FROM DRIVE Flashcards

1
Q

Sows

A

Female pigs that have had piglets

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2
Q

Gilts

A

Female pigs that haven’t had piglets

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3
Q

Pig uterus

A
  • bicornuate
  • long horns
  • short body
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4
Q

Oocyte production

A

15-30 oocytes per estrus

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5
Q

Puberty

A

150-220 days old

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6
Q

First AI

A

2nd or 3rd estrus cycle

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7
Q

Gestation

A
  • 3 mos, 3 wks, 3 days (113-155 days)
  • avg is 115 days
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8
Q

Lactation anestrus

A

16-40 days

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9
Q

Weaning to estrus

A

4-6 days

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10
Q

Estrous cycle

A

18-24 days

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11
Q

Estrous phase

A

4-6 days

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12
Q

Luteal phase

A

15 days

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13
Q

Time from estrous to ovulation

A

36-44 hrs

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14
Q

Duration of estrous w/o boar

A

<24 hrs to >96 hrs

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15
Q

Duration of estrous in presence of boar

A

40-60 hours

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16
Q

Placentation type

A

Epitheliochorial

17
Q

Follicular phase events

A
  • estrogen increases as oocyte & follicle mature to ovulation
18
Q

Proestrus events

A
  • E2 and FSH increase to prep for estrus
  • some LH released
19
Q

Estrus events

A
  • oocyte is mature
  • E2, FSH,& LH increase -> rupture of follicle & ovulation
20
Q

Luteal phase events

A
  • progesterone increases due to CL development
21
Q

Metestrus events

A
  • E2, LH, & FSH decrease
  • female isn’t receptive to male
  • follicles begin luteinization -> corpus hemorrhagicum -> CL
  • CL secretes progesterone
22
Q

Diesstrus events

A
  • 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
23
Q

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

A

It is coming into heat

24
Q

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

A

It is in heat

25
Q

Standing heat

A
  • 12 hrs after 1st AI
  • 12 hrs after 2nd AI
  • Ovulation & fertilization
26
Q

How does suckling suppress LH

A

Inhibits GnRH from hypothalamus which prevents follicular wave from being produced

27
Q

Days to allow uterus to involute

A

21-28

28
Q

Weaning piglets too early can cause

A
  • decreased FSH and LH -> follicular cyst development
29
Q

Follicular cysts

A

Follicles grow, no ovulation bc LH too low

30
Q

Hormone that stimulates ovulation

A

HCG

31
Q

PG 600 (400 IU eCG & 200 IU hCG)

A
  • Induces puberty
  • come into estrus 7 days post-inject.
32
Q

Altrenogest (Matrix)

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

Theriogenology (7 decks)

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