Warren, I have a little over 1/3 of my herd is red, but not the SPOTTED ones. Red with white faces, socks, tail, bellie, but no spots right now. The spotting gene is recessive and we bred against spots because of the industry discount (feedlot). So, difficult to come up with both parents carrying the spotting gene AND both pass it on. Spotted Simmies are getting more popular because they are so eye catching. If we breed a WF to a WF, all bars are down. You might get full white bellie, socks all the way up, full tail and face. Might not get the spots, but you may get more white than you wish for. Obviously, I love the REDS.
The bull in my avatar was a bull I raised and collected. Hauled him out to Ohio Beef Expo and 2 semen companies signed him up. Sold many thousands of semen thru Cattle Vision and SEK Genetics. I still use him. He was the first black Simmental bull I ever bred to -born 9-29-02. I have had black Simm since 1970 because I had some commercial black cows. Black is a VERY dominant gene.