Don't worry about it. Shoot I've eaten raw green beans, a turkey ate half of a 3 foot round ruhbarb plant (oxalic acid), leaves and all never getting sick. Got to 50lbs and made a fine meal. Chickens eat styrofoam, nails, dried rice, onions, tomato leaves, apple seeds (cyanide), and about every "no good" food on the "do not feed" list in some amount as they free range. Avocado hasn't even made them sick. Granted, if they find they do not like something, like onions, tomato leaves or ruhbarb leaves, they tend to leave it alone. Small quantities of even things containing low toxin levels won't hurt, just don't make it their entire diet.