Estes Formula for Breeding Stakes Winners

[alina]

Hi, I am alessandro. iam Italian boy. i trying to translate the book of the myth of Estes in italian
i have a problem with a paragraph.

estes write:
I have used this average-earnings index as a measure for the progeny of the mares in this group.
All these mares in the group foaled in the years 1930 through 1941 inclusive have had at least one foal to race. (I took the liberty of eliminating at the beginning the mares which I knew had died without producing foals.) This makes a total of 120 mares whose records may be summarized. We might begin at the end, by adding all their records together.
These 120 mares have had a total of 605 living foals, not including two-year-olds of 1952. Through 1951 racing, 529 of these foals had started, or 87.4 per cent. They had earned $13,620,741. This is an average of $22,514 per foal, including the non- runners.
Turning to the use of the average-earnings index, the 529 runners had raced by the end of 1951, a lotal of 1,605 years, that is, there were 1,605 year- barters. They earned as much as was expected of 5,874 year-starters; 5,874 divided by 1,605 is 3.66 - i lir average- earnings index for the group. This is to say, ihey have earned at the rate of 32h times the in H inal expectation of the years in which they raced

my question is:

what is 1.605 and 5.874????



thanks for help

good day

[vineyridge]

The average earnings index is a staple tool for breeders here.

Here is a very good explanation of it and how it works.
http://cs.bloodhorse.com/blogs/scot/arc ... eding.aspx

The particular numbers you have asked about are most likely (and someone here will correct any of my mistakes) are for comparing the "working life" of TBs and their earnings. The 1,605 number means the total years in racing spent by the 529 horses. Then he looked at the amount of money earned by the 529, and found out how many total years in racing it would take a random group of horses (the average annual earnings of tb racehorses) to earn the same money. That figure came out to 5, 874. So the foals of the 120 mares earned more than 3.66 times the money over their racing careers as a random group of runners over their careers.

[alina]

thanks vineyridge very gentleman