This was the study Dennis did in 2008: Since this topic seems to come up quite a bit, on the outside chance that anyone might actually be interested in some facts concerning the matter, I've been doing some research. I wanted to get a sense of about how old the dams of All Americans were at the time they whelped their AA offspring, and see what we could see. I used the All American Teams from 1963 through 1985. This was in the heyday of track racing, when the criteria was more objective in choosing the teams, and it provided me with a 162 dog sample---plenty large enough. There were 3 dogs, of whom the age of their dam at the time they were whelped I was unable to determine. They were not figured into the mix. If a dog appeared on the AA team more than once, he was not counted for those additional appearances. The average age of a brood when she whelped her All American offspring was 5.58 years of age. The median age of broods when they whelped their AA offspring was roughly 5.25 years of age. Females ranging from 2-plus to 10-plus years of age produced an All American. The raw percentage of AAs whelped from a brood of 8 years of age or older is 10.49%. The raw percentage of AAs whelped from a brood of 7 years of age or younger is 85.19%. Then Martin Roper followed up with this: Nothing much changes. I was able to borrow a copy of The Greyhound by "Stonehenge," published way back in 1853. I found the following interesting table: BEST AGE OF DAM NUMBER OF MAJOR STAKE WINNERS 1843-1853 01 0 02 xxxxxx7 03 xxxxxxxxxxxxxxxxxxxxxxx25 04 xxxxxxxxxxxxxxxxxx20 05 xxxxxxxxxxxxxxxxxxx21 06 xxxxxxxxxx12 07 xxxxxxxx9 08 xx3 09 0 10 1 Some of the current day breeders were trying to refute what Dennis researched and one said that Dennis only went to 1986. So Dennis then went and did the stats from 1986 to 2003 and the results were pretty much the same. From the All American Teams of 1986 through 2003, using the same methodology, we had 132 subjects. The average age of females from this group, when they whelped their All American offspring, was 5.65 years, (compared to 5.58 for the previous group). Not a significant difference. Again, the median age was roughly 5.25 years, the same as the other group. Again, females ranging from 2 through 10 yoa produced All Americans. The raw percentage of All American whelped from dams 8 yoa or older, was 11.36%...(compared to 10.49% for the earlier group.) The raw percentage of All Americans whelped from dams who were 7 yoa or younger, was 93.18%.....(compared to 85.19% for the earlier group)......which would lead one to infer that perhaps more younger females are being saved for breeding, or retired early for breeding today. Whatever it means, the percentage of All American producing dams who were 7yoa or younger when they whelped their All American is significantly greater than in the earlier group. The trend line for All American producers points to younger, not older. Make whatever you like of it, but there it is.
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