I don't think any rams are to be trusted, there may be some exceptions but generally they can become reactive over ewes and/or feed. My Ryeland ram was a docile pussycat until his second year of tupping, when he suddenly started charging me whenever I crossed the field if he was in there with his ewes. He reverts to being fairly docile if not kept with the ewes, which I now don't do because he was butting both the ewes and lambs and butted one lamb right through the electric just because it was in his way!

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I have another large tup, a Zwartbles, he's also a friendly one but I've seen the power he has when butting the Ryeland and I wouldn't like to be in the way! I had a Gotland who was very 'butty' but after being whacked across the knees with a piece of blue hose he got the message and all I had to do was smack my leg with it and he'd back off. Not tried that with the Ryeland or Zwartbles, they are big powerful rams and I'd have to be a bit quick!
Rams will live quite happily with other wethers or rams if not near females. I have a group of three rams and one wether at the mo, they are fine to feed (but I never turn my back on them!

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