In a horses diet how are the cereals given?

do you mean how??? this would be crushed and in a feed bowl.

crushed , flattened and maybe whole i think

Alaways feed cereal grains that have been processed using a combination of heat, moisture and pressure, with the exception of oats for some horses Always read the instuctions on the bag or box . . ....

Crushed, powdered, or how it is! U can also soak them in hot water for 2 minutes or so, so the horse won't choke, but they tend to be a bit mushy. This way is better with oats.

they are meant to be served crushed