ISU ANS 216 - Genetics06 (38 pages)

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Genetics06



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Genetics06

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Pages:
38
School:
Iowa State University
Course:
Ans 216 - Equine Science
Equine Science Documents

Unformatted text preview:

Genetic Selection of Horses Introduction Genetics are not as utilized in the horse industry as in livestock species who select for size length weight efficiency of or maximal production of livestock Horse breeders look more at pedigree eye catching traits and subjective criteria What traits do horse breeders select for Soundness Conformation Reproduction Athletic ability Speed Style Hunter etc Color pattern Disposition manners Performance Difficult to Measure Traits Conformation Disposition Athletic ability Intelligence GENETIC RELATIONSHIP TO OFFSPRING RELATIONSHIP DIRECT Sire or Dam Grand sire or dam Great grand sire or dam COLLATERAL Full sib 3 4 Brother or sister Half sib First cousin RELATIONSHIP 50 0 25 0 12 5 50 0 37 5 25 0 12 5 Breeding Systems Crossbreeding breeding different breeds together major heterosis variable results breed registry book closed AHR and Half Arabian open ApHC and APHA to QH AQHA ApHC APHA to TB Breeding Systems Outbreeding mating crosses of horses less related than the average within a breed variability large heterozygosity increases increases genetic pool Outbreeding Native Dancer Raise A Native Lines of Power Raise You Bold Ruler Exotic Garden POLITICAL WHIT The Garden Club Matsadoon Doonesbury Political Parody Vaguely Nice Roberto Breeding Systems Inbreeding breeding horses more related than the breed average increases homozygosity increases the predominance of recessive diseases uniformity of offspring increases Linebreeding increases the relationship to some admired ancestor relationships within a pedigree are additive Three Bars Zippo Pat Bars Leo Pat I Inspire Big Step Teeny Step Teeny Brown CK Zippos Bar Bee Zippo Pat Bars Zippo Bar Pine Dollie Pine Zip Bar Bee Double Bar Leo Money Bee Honey Chetterette Bar Effect of inbreeding Uncover undesirable recessive genes Reduced vigor Reduction in growth rate Increased mortality in offspring Reduced immune response of foals Performance Trait Selection How do we measure performance



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