Analysis of the Sexual Differences of Racing Performance of the Thoroughbred by the Analysis of Covariance
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概要
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Studies were made on the sexual difference in ability to race of the Thtroughbred by using data collected from 19, 316 mares and 26, 995 stallions of this breed. With the time of running as an indicator of this ability, analysis was made on the relationship between the time of running and the weight to be carried when the track condition was firm on the turf course. The differences in sex and racing distance were taken into consideration in it. After that, covariance analysis was performed to examine the sex difference in ability to race when the weight to be carried was taken into account. The results obtained are summarized as follows.<BR>1) There was a significant difference (P≤0.01) in mean weight carried between the mares and stallions, regardless of the racing distance exmined. 2) The coefficient of correlation between the weight carried and the time of running and the regression coefficient of the time of running to the weight carried bore a mirus sign, regardless of the racing distance. 3) Covariance analysis revealed that there was a significant difference (P≤0.01) in the time of running when the racing distance was 1, 000, 1, 200, 1, 400, 1, 700, and 2, 400 meters.<BR>The results mentioned above were studied collectively in combination with those of the test of differences in intercepts of the regression line and the test of differences in regression slopes. In consequence, it was concluded that there might be a difference in ability to race between the mares and stallions examined.
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