I purchased four two kilo 'Red Rockies' today from the farm shop. They are clearly labelled 'for cattle, horses, deer and goats'. And they also have a clearly printed label 'DO NOT FEED TO SHEEP!'
At £2.37 each they seem very reasonable. I've attached them to tree stumps rather than live trees. I wouldn't want the land owner moaning should the salt effect the trees health or the surrounding flora, (its a sensitive area). During the Autumn months I will take the wind fall apples and pears from the garden and scatter those, the Munties love 'em!