You might not believe this. All racehorses have their birthday on 1 January. If yours was born on 11 December, hide it some place ! It has a divinely improved chance to win races if born on or just after 1 January or registered that way. Perhaps another foal was born in August. Tough luck, unless it was reborn next year if you know what I mean. Undoubtedly, trying to negociate the mares with the arbitrary date of 1 January has contributed to the low ferility rate of 50-60 % in these horses,

A mare needs 16 hours of daylight through October on to ovulate in January.