I've had occasional fun with the calves of my identical twins, in the first couple of years using the same sire, so the calves were genetically full siblings.
Just as different from each other as any other fraternal siblings but interesting to watch them growing up together, in the same season. Both were scatty as all, so went off to grow out somewhere else.
Right now I'm wrestling with the decision on whether or not to send one of the twins away to slaughter. She's too hot-tempered for my herd but it's been so very interesting having the two and seeing how they relate within the herd. Easy to mix her back in with the main mob, since all the other cows will take no notice, because for them, she's already there in the body of her twin.