Selection of Breeding Stock Flashcards
producers evaluate possible breeding stock on what 3 main factors
- genetics
- expected genetic potential
- phenotype
when 1 or both testis retained in body cavity (if both are retained the boar is sterile)
cryptorchidism
tipped vulvas and have portions of male sex organs common in large litters due to over crowding
hermaphrodites
most are genetic female - XXX
hermaphrodites is mostly commonly found in what 2 breeds
Yorkshire & Landrace
failure of nipples to protrude from the udder surface preventing milk flow
inverted nipples
can inverted nipples be passed from boar to daughters?
yes
intestines drop into the scrotum due to weakness of musculature surrounding the inguinal canal
scrotal hernia
weakened muscle in naval area causing intestine to protrude through belly wall (sometimes fatal during growth because the intestines get strangled)
umbilical hernia
incomplete development of muscle fibers in the front and rear legs
splayleg or spraddle legs
most common leg disorder in swine
spayleg/spraddle leg
can spayleg be treated?
only somewhat successfully
4 things that are caused by the Napole gene (RN)
lower muscle pH
pale meat color
lower water holding capacity
increased cooking loss
allows for simultaneous selection of multiple traits and weighs EPDs relative to their economic value
swine indexes
3 things that weigh EPDs relative to their economic value
- Terminal Sire Index
- Maternal Line Index
- Sow Productivity Index
economic index designed to select boars to be used as sires in crossbreeding programs
Terminal Sire Index
the Terminal Sire Index combine what 3 things?
growth
lbs of lean
backfat
SPI includes what 3 things?
born alive
litter weaning weight
lifetime # born alive and litter weaning weight
what 3 things are considered regarding capacity?
width through rib and body
depth of body
length of body
indicates economic value of the progeny produced
Maternal Line Index
hoe many functional teats should a sow have per side
6 per side
what 3 things are considered regarding muscle?
thickness through center of ham & stifle
width between rear legs
shape over lion & top
what is the average for TSIs?
100
>100 is more desirable
<100 is less desirable
is the Napole Gene a dominant or recessive gene?
dominant
6 terminal traits wanted
more backfat large loin area less days to 250 more lbs of lean high average daily gain smaller feed efficiency (lbs feed/lb gain)
