[Le Monde]

‘In season’ is when a mare is about ready to cover. The general ‘in season’ lasts for 3 days, of a 3 week cyle. Mares start coming into season during the warm weather, so every 3 weeks from Feb/March – Autumn.
It affects all mares differently. Some you will hardly notice, some will squirt and squeel all over the place, some will get very uptight and tie up.
Some mares will ‘come into season’ more easily then others, ie long lorry journey, showing them a fence the day before they run.
Being ‘in foal’ eliminates all these factors. As does using a drug called Regumate, which is illegal in racing.

what does Regumate do and why is it illegal? They use it in eventing

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