Has anyone else ever heard that calves that get 8 way ( with the tetanus included) gain poorer on average that calves that get 7 way ( without tetanus included). I heard this a few years ago from several long time producers, and they claimed 15 - 25 lb less weight at weaning, in tetanus vaccinated calves. My vet says he has heard this as well, but cannot find anything to document it. He says that he has to stock both 7 way and 8 way vaccine, because there are still people who will not give tetanus to their calves. I have used both, and really have not seen any difference. I have always thought this was a " rural legend" as opposed to an " urban legend", but I know of several well known breeders who will not give their calves a vaccine with tetanus in it to this day. I have asked many people about this, and either they truly believe it... or they do not know. I am in the do not know category, with very strong leaning to this being totally false. What makes me wonder is that some pretty prominent breeders truly believe this as fact.