I have owned Salers! and yes, they can be really protective, but a Salers bull on a good docile cow can make for a nice momma, the great grandma of most of my herd was 1/2 Salers and a great cow, very docile, her best daughter I can put a bucket under her and milk her right after calving, but she will put a stomping on a dog and she sees *everything*... That leads me to say they should have the brain power to differentiate between a human and a wolf (it's really not that hard)
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Zeus is a good boy, Momma pictured above
For bulls, you have to differentiate between being tame (OK, you can scratch my neck) and being docile and cool headed since just because you can pet them doesn't make them cool!
This is the one that I stood on his back and shot 2 shots off with the .22.. he hasn't seen me in a year, he can't be arsed to even get up to say hi
Hector (no salers) was always cool headed, the only time he bellered at me was when I had done a prolapse fix the night before and my boots were covered in all sorts of smells he didn't like
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As young calves, I play with them like all the rest of them, I find by about 2 months old and when they're on pasture they lose interest in playing anyhow, and I ALWAYS win the pushing contest!
Here's what happens around here when a heifer has a calf... she finally figured out she had to lick, not the calf, but me.. and revealed my serious hat head