we use lot's of varieties on our place in woods , from fancy to not , our animals for whatever reason have a definitive like for these here " pink" blocks from tractor supply.
the images below show one that is 2 weeks old , the first image was 1 week on the ground with 2 bites out of 2 corners and the second week it looked like it does now ....
even pigs hit it ....go figure ....and they ain't even supposed to like salt blocks