ANALIZE: A very Old Stallion with a very young mare

[Jorge]

Question for breeders who has bred 25-plus-years-old stallions:

Have you noticed any objective or subjective differences worth commenting about foals being sired by a 25-plus-years-old stallions out of very young mares vis-a-vis when that stallion covered regular older mares?

I am posting this question with Cozzetti (2009) in mind, whose forgotten sire (Cozzene) was 29 year old but his dam was a very young mare.

[Crystal]

I don't think the genetics would change at all, but the possibility of being fertile (i.e. number of quality sperm to reach the egg) would be less and less each year. So there fore getting in foal maybe an issue.

However I have had hormonal teenagers of 20 year old stallions with low fertility and puppy dogs for 20+ year old stallions who look at a mare and she is in foal..

[vineyridge]

The younger the female, the better the eggs.

[dublino]

The younger the female, the better the eggs.

The younger the female the easier to get pregnent eggs don't change quality over time.

[parlo]

I made a study with some 7,200 horses out of some 2,200 mares on age of sire (at covering) and dam (at birth of foal) considering the highest lifetime-rating of the progeny from that mating.

I found a reliable tendency: the older the parents the lower the (average-) highest lifetime-rating.

That means: there is a good chance to reduce this general negative aging-effect with a mating of an old mare to a young sire and vice-versa.

[erins isle]

When a stallion proves to be fertile at an old age, I see no point in sending a mare to him. I've got this from an Irish breeder who sent my maiden (5yo) mare to a rather old stallion then (On Your Mark). On the other hand, the rusult a filly wasn't a great one.

[Jorge]

When a stallion proves to be fertile at an old age, I see no point in sending a mare to him.

Would you like to expand your comments with
examples you know, especially regarding the last sentence.
Thanks in advance for your comments.