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Synonyms of Footfall: footstep, tread, step, pace, sound
I suppose both are equally common.
Foot traffic
A footfall is the sound of a footstep. Business may use the term to refer to the number of people entering a store.
footfall jamboree
step, tread, footfall
No more than fillys or any other foal.
A baby horse is called a foal. The females are called fillys and the males are called colts.
May to September has the highest footfall
Football and footfall are two that come to mind.
Fillys can show heat as early as 6 months. That being said immature fillys will generally cycle sporadically or produce what is called a persistent follicle that limits their ability to get in foal even if bred. Two year old fillys will often cycle regularly.