Selection of Swine Breeding Stock Flashcards
Visual Appraisal
confirmation, soundness, health, behavior
VA: soundness of all pigs
feet and legs, external genitalia (size and shape, maturity level), underline (teat placement, size, functionality)
VA: health
temorary – set back but can recover
permanent – change affects it forever
VA: behavior
maternal – savage sow syndrome
human interaction – (temperament is subject to change)
Performance Data
selection based on animal performance
-SPI - sow productivity index
-growth rate
-feed efficiency
-BF - backfat
-LEA - loin eye area
-genomic data
PA: S.P.I.
Sow Productivity Index
–> number of pigs born, litter weight at weaning
Genomic Evaluation and Profitability
-production
-reproduction
-carcass
GE: production
days to market, feed intake, birth weight, pre-weaning survival, weaning weight, feed efficiency
GE: reproduction
LEAST HERITABLE
–> number born alive, age at puberty, wean to estrus, longevity, teat number
GE: carcass
HIGHLY HERITABLE
–> fat depth, carcass weight, muscle depth, ph, drip loss, tenderness, color
Breed Selection.. what breeds are maternal and which breeds are terminal?
Landrace and Yorkshire = maternal lines
Duroc and Hampshire = terminal lines
Crossbreeding
combine desirable traits from both breeds
–> capitalize on hybrid vigor (heterosis)
rotational cross
***be able to draw it out
home raised replacements
terminal cross
***be ale to draw it
-3 breeds
-commercial industry
-all progeny go to market
-do NOT make replacement gilts
heterosis
progeny perform at a greater level than the average of their parents
