Genetic Disorders in swine Flashcards
what is porcine stress syndrome
causes pale soft exudative pork
autosomal recessive
DNA test for the ryanodine receptor gene
affected animals have - increased % lean, meat is paler in colour
what is rendement napole
the hamshire effect
dominant allele that decreases ham size by 8%
increased lean 1%
selected against in north america
what is the ESR gene
DNA marker for litter size
patented by PIC
equates to more than one piglet
what is a prolactin receptor
associated with total number born
number of born alive
what does KPL2 cause?
recessive on chromosome 16
causes short tailed sperm, immotile
there are DNA tests available
what are common genetic defects?
hernias
cryptorchidism
splayleg - can tape legs
atresia ani (no anus)
how are pigs traced
pigTRACE - 2014 traces pig movement
slap tattoo - 5 digit herd number
ear tag - 5 digit herd number or 25 digit individual ID
what do consumers demand and what has it effected
leaner meat
not face fertility ans flavour issues through selection - chr 4
what meat traits are selected?
backfat thickness
lean cuts
loin depth
loin length
tenderness
litter weight
weigh
efficiency of gain
what female reproductive traits are selected
litter size, pigs weaned, age at puberty
(number conceived does not mean litter size - embryonic loss and mummified fetuses)
what do we select for in male fertility
testis weight
sperm quantity
libido
what type of mating systems are used in pigs
inbreeding - but not done commercially
crossbreeding - normal in the commercial industry
yorkshire X landrace is common
