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KMID : 1025520080500060747
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Journal of Animal Science and Technology
2008 Volume.50 No. 6 p.747 ~ p.752
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Trends on Racing Speed Traits in Thoroughbred Racehorses
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Park Keong-Do
Lee Hak-Kyo
Jeon Gwang-Joo
Kong Hong-Sik
Cho Byung-Wook
Cho Kwang-Hyun
Son S.-G.
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Abstract
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This study was carried out to calculate genetic trends on racing speed traits of Thoroughbred racehorses, using a total 208,043 racing records of 9,934 heads collected from January, 1990 to December, 2006 in Gwacheon racecourse. Repeated time, winning time and annual best time were used racing speed traits. The estimated heritabilities and repeatabilities for repeated time, winning time and annual best time were 0.288, 0.275, 0.341 and 0.502, 0.475, 0.496, respectively. Average phenotypic improvement per race year for racing speed traits were ranged from －0.115 to 0.148 second. The other side, the genetic improvement per race year for repeated time was －0.027 second but winning time and annual best time were not shown consistent trends. Therefore, we concluded that repeated time is recommended improvement trait of Thoroughbred racehorses.
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KEYWORD
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Repeated time, Winning time, Annual best time, Genetic trend
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