December is the best month to put out salt on your rabbit running areas. Supposed to make them more fertile when breeding starts in a couple of months. I know they do love to lick and bite the salt, and their teeth make grooves. I use the 4 lb bricks. White. Usually cost about $2.00-2.25 each at a local ag supply store. I buy 35-40 each year to spread around my farm. I always put them in thickets where rabbits will be safe when they come to the salt, and where it’s harder for deer to reach. It is gone by spring. Try it and see if you have more rabbits next fall.