ANSC354 Mating

1%

Purebred pigs represent what percentage of the total US pig population?

1) genetic diversity

2) genetic progress

Pure breeding is necessary to maintain what 2 things?

crossbreeding

mating animals of different breeds

1) additive gene action

2) non-additive gene action

2 types of gene action

incremental gene action

number of alleles of gene an animal possess determines how “much” of a trait is expressed

polygenic

Almost all traits are ______ (controlled by multiple genes)

average trait of parents

In additive gene action, the offspring trait is what?

heritability

amount of variation due to genetics

heterosis (hybrid vigor)

offspring trait differs from average trait of parents

individual heterosis

used for improvements in performance traits like growth rate & feed efficiency

maternal heterosis

used for improvement in performance in sows & their progeny from using a crossbred dam

paternal heterosis

used for improvement in performance in boars & their progeny from using a crossbred sire

1) Two-Breed Terminal Cross

2) Three-Breed Terminal Cross

3) Two-Breed Rotational Cross

4) Three-Breed Rotational Cross

4 types of mating used in the swine industry