Historic Genetic Characterization of King Ranch Quarter Horses

Historic Genetic Characterization of King Ranch Quarter Horses

by Lauren K. Dobson

59 pages· 2008· ISBN 9780549849223
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The main objective of this investigation was to conduct a retrospective trend analysis from 1915 to present on ancestral breeding, genetic relationships, and inbreeding of King Ranch linebred Quarter Horses. Results were from analysis of eight-generation pedigrees of 16 stallions and 74 mares used for breeding on King Ranch in 2007. A composite pedigree file (n=463 animals) was based on numeric codes for each animal and its sire and dam, tracing ancestry back to Old Sorrel (born in 1915). Results revealed the average influence of F was 89.2+/-0.8 and 80.8+/-1.8% (P0.05), and for the U influence was 31.7+/-3.3 and 27.2+/-1.1% (P0.10) for stallions and mares, respectively. Computed mean genetic relationship coefficients of stallions and mares to Old Sorrel were 6.4+/-1.0 and 10.8+/-0.6% (P

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