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ASC 408G Swine Production > Selection of Breeding Stock > Flashcards

Selection of Breeding Stock Flashcards

1
Q

producers evaluate possible breeding stock on what 3 main factors

A
  • genetics
  • expected genetic potential
  • phenotype
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2
Q

when 1 or both testis retained in body cavity (if both are retained the boar is sterile)

A

cryptorchidism

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3
Q

tipped vulvas and have portions of male sex organs common in large litters due to over crowding

A

hermaphrodites

most are genetic female - XXX

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4
Q

hermaphrodites is mostly commonly found in what 2 breeds

A

Yorkshire & Landrace

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5
Q

failure of nipples to protrude from the udder surface preventing milk flow

A

inverted nipples

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6
Q

can inverted nipples be passed from boar to daughters?

A

yes

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7
Q

intestines drop into the scrotum due to weakness of musculature surrounding the inguinal canal

A

scrotal hernia

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8
Q

weakened muscle in naval area causing intestine to protrude through belly wall (sometimes fatal during growth because the intestines get strangled)

A

umbilical hernia

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9
Q

incomplete development of muscle fibers in the front and rear legs

A

splayleg or spraddle legs

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10
Q

most common leg disorder in swine

A

spayleg/spraddle leg

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11
Q

can spayleg be treated?

A

only somewhat successfully

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12
Q

4 things that are caused by the Napole gene (RN)

A

lower muscle pH
pale meat color
lower water holding capacity
increased cooking loss

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12
Q

allows for simultaneous selection of multiple traits and weighs EPDs relative to their economic value

A

swine indexes

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12
Q

3 things that weigh EPDs relative to their economic value

A
  1. Terminal Sire Index
  2. Maternal Line Index
  3. Sow Productivity Index
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12
Q

economic index designed to select boars to be used as sires in crossbreeding programs

A

Terminal Sire Index

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12
Q

the Terminal Sire Index combine what 3 things?

A

growth
lbs of lean
backfat

12
Q

SPI includes what 3 things?

A

born alive
litter weaning weight
lifetime # born alive and litter weaning weight

12
Q

what 3 things are considered regarding capacity?

A

width through rib and body
depth of body
length of body

12
Q

indicates economic value of the progeny produced

A

Maternal Line Index

12
Q

hoe many functional teats should a sow have per side

A

6 per side

12
Q

what 3 things are considered regarding muscle?

A

thickness through center of ham & stifle
width between rear legs
shape over lion & top

12
Q

what is the average for TSIs?

A

100
>100 is more desirable
<100 is less desirable

12
Q

is the Napole Gene a dominant or recessive gene?

A

dominant

12
Q

6 terminal traits wanted

A 
more backfat
large loin area
less days to 250
more lbs of lean
high average daily gain
smaller feed efficiency (lbs feed/lb gain)

ASC 408G Swine Production (10 decks)

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