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If a foal is
conceived too late as in summer, it likely will not race till it�s 3. The
costs up to the first race include the stud fee, the care of the mare and
her foal, and training as a yearling and 2-year old. Earlier matings give
quicker returns�of course. Most mares are bred midFebruary to midApril.
However, today 2 covers or even less not 3 as in 1960 are possible, raising
the earning power of the stallions. They too are affected by hours of
daylight, by aging and other common factors. Month 5 is April, 10 is
October. The graph of the days of the estrus cycle are given
on the Y axis and the 12 months of the year on the X axis. April to October
has shorter cycles than winter of course. R squared is the coefficient of
determination, FitStErr is the standard error of the fit and F is the F
ratio. The weak F value can be and should be raised by getting a larger
sample of records. These are natural values. Values after hormone
administration and lengthening the daylight duration should be pursued. |
