In the USA/Northern Hemisphere, many breeds of horses use January 1st as the official foaling date of all foals born in a certain year.
August 1st is the official date for the Southern Hemisphere.
I could not find a specific date when this rule was instituted.
The first of August is known as the horses birthday! August/september is also when most foals are born. I hope this answers your Q
August 1 in Australia and January 1 in the US and most other parts of the world.
Actually, January 1 is used as the common birth date for horses in the northern hemisphere and August 1 for horses in the southern hemisphere. This is to coincide with horse racing seasons.Another user said:Thoroughbred breeders breed the foals to be born on the first of August so that when the time comes for the foal to be broken it is the right time of year for them to race. And other horse owners celebrate their horses birthdays on the 1st of August because they may not know when the horses actual birthday is and so they celebrate it on the 1st of August.
august 1 1997
The official birthday for all race horses is January first
August 1 1987
29 August 1993
Pertinax was born on August 1, 126.
Mancini was born on August 1, 1980.
Coolio was born on August 1, 1963.
Don't know the birthday but her death was August 1, 2009
August 1, 1989 (age:23)