I'm no expert, but I know it's not good for your horse to suddenly =
change
feeds. When it's cold, more hay is better than more grain. The =
digestive
process produces more heat from hay. If you're going to change or add
different feed, do it gradually over a period of about 7 days. I do =
this
even when changing types of hay. You also need to make sure your horse =
is
drinking plenty of water. They tend to not drink cold water. Colic is =
a big
danger in colder weather for this reason. Try giving warm water a =
couple of
times a day. Providing ample salt is another way to encourage drinking =
and
it helps them retain water . Your horse may be reacting more to being =
kept
stalled or from the change in temperature. Do you blanket?