If you search the net, there have been quite a few studies on twinning in dairy and beef cattle. Twins are more common in Holsteins than most beef breeds.
If I was to select a herd for twinning, I would start on the maternal side and buy replacements that are dizygous fertile twins and/or carrying twins, preferably heifer twins. There is the freemartin issue. I would also select for bulls that are twins and keep their daughters.
In reality, in my situation I would not do this. This process should increase the beef cattle twinning rate from 1% to something greater.
If I was to select a herd for twinning, I would start on the maternal side and buy replacements that are dizygous fertile twins and/or carrying twins, preferably heifer twins. There is the freemartin issue. I would also select for bulls that are twins and keep their daughters.
In reality, in my situation I would not do this. This process should increase the beef cattle twinning rate from 1% to something greater.