The term "adrenaline" is used to describe the hormone's effects in all species. So, when talking about horses, you would still refer to it as "adrenaline."
What it the name for adrenaline in horses?
Horses don't have a specific name for adrenaline like humans do. Adrenaline, also known as epinephrine, is a hormone and neurotransmitter found in all mammals, including horses.