I know there are tame Leghorns .Many are not,but the real bad crazy wild ones can be their own worst enemy (lack the minimum brain function) and should not be bred from .Those that scream and will not calm down when handled or coop trained,need to go as well. You need to move slow while you work and not scare Leghorns,most will calm down in time,but if young and not handed they can be like pheasants.I think it helps to have pens they cannot get away from you too easily .They can be very smart and will respond to treats and hand feeding.Any bird that does not calm down in an individual coop after a month or two of regular handling should not be bred from.Believe it or not the absolute worst birds I ever saw or handled were Cochin bantams,could not get over it,and I am sure that is not very common,but it goes to show exceptions exist.If I could change Leghorns,it would be the temperments,I am sure they would be more popular and enjoyable to work with if they were calm,for many people admire their form,feather,style and gracefulness,not to mention the egg laying ability.I cull for Leghorn temperament,but find sometimes I have to keep borderline ones that have other outstanding traits.Other times a really nice bird has to go because it is just insane and when I do not cull those,I get more as bad and wish I had culled the one I handle my Leghorns every few weeks to check for defects,check wing bands,treat for lice,etc. Some people keep Leghorn like wild pheasants and never touch them,they can do well with all that exercise,free range, and be healthy,just as long as they have some predator protection.With frost bite,it is usually the males points.Some winters I get none of it,much depends on the coop and the dampness.All the Leghorns come in both Rose Comb and Single Comb.I have never liked the Rose Combs due to fertility and hatchability issues that the single combs do not have.I have seen it too many times and cannot stand to waste all the eggs I have to throw out with rose combs not hatching.I have had others disagree on this stating some forms of rose comb genes are not bad,it is possible but I will stick with the frost bite and single combs.It also helps to breed a bit smaller sized single comb.closer to the body with better blood flow.