I'm a huge advocate for crossbreeding! That is the only way to use herefords. Yes they will add pounds, any F1's will. If your calves are bring more at your local auction, then yes , you should be using them. In the midwest you can't hardly give hereford babies away. I run a feedlot, of some size, and I would never buy a truck load!! Unless your in a branded program, packers arent going to pay top dollar for them. Every breed has its advantage, even herefords, but those advantages fit in only a select few situations. I used hereford bulls on my so called sorry black cows, for several years, thinking I would get this so called super baldy cow. I will tell you those cows that are left are 5 to 7 yr old, and I am trying to clean them out. Prolapse, yup- Pinkeye, check- Lazy mothers, you got it. Docile yes- good teats and above average udders yes. Breed back timely- not so much. Calf growth, vigor, and thickness- so.so... I wanted great cows, I dont' care about color- I went with red angus.