Our kids showed fleck sims and simbras back in the 90s. We bought a solid black simbra, he was a beauty. This was before everything sim started to turn black. Everyone was looking past him, going to the wildly colored red and whites. I believe it was him that put this super growth gene in some of our calves. Since, we've been selecting the ones we could see in it. Simbras grew enormous. The cow that produced this bull prospect is massive. The only drawback to this line is missing their second calf. We breed them at 14 mos, so, missing that second calf isnt a deal breaker. That year of the missed calf, they grow grow grow. This cow is so big, she almost didnt fit through the vets chutes...lol Now, we dont really want cows that big, but, a few to get replacement bulls out of yes. That simbra line is dwindling in our herd. But, i get happy when i see a calf like this one each year.
Just a note, back when our kids showed simbras, the simbra class resembled a rodeo more than it did show heifers. We had one drag our daughter through a parking lot, but then went on to win overall champion.. Sweet one min, a nut the next.