Pigs: Genetics and Breeding (Basics of Pig Breeding (Heritability…
Pigs: Genetics and Breeding
Current and Future Developments
Statistical methods to improve the accuracy of selection
Introduction of transgenic pigs
How Do We Cross Or Mix Breeds?
Male - complementarity (terminal sire line)
Female - complementarity (preferred breed mix)
3rd Consideration: How Do We Change The Traits Of Pigs?
Distribution of genes: replacement of population
Crossbreeding hybrid vigour (maternal, offspring, paternal)
Genetic selection: performance and progeny testing
What Breeds Should We Use?
Reproductive: large white, landrace
Male requirements: Landrace, large white, hampshire
Why is selection important?
Easy to import
Easy to measure
Genetically selecting the best traits
Other traits (milk production, meat quality)
Reproductive (litter size, farrowing frequency, puberty) FEMALE
Carcass (Back fat depth low, lean percentage, Dressing percentage - high percentage of saleable products)
Growth (feed conversion rate, weight/growth rate) (MALE)
Basics of Pig Breeding
Heritability (additive genetic variance with values range from 0-1)
Variance (breeding based on variation)
Complex inheritance (group of genes - economically important)
Simple inheritance (single gene - not many important economic traits of this type)