- Feb 7, 2007
- Blue Rapids, Kansas
We've been using this Pfizer product since it was introduced (maybe 10 years). Have had more than one Veterinary\cattle guru tell me that we'er wasting time and money boosting old cows. Once calves are backgrounded properly, there is no need to keep reintroducing the anti-genes (hope that's the right terminology). Sure made working the old beasts a lot easier not giving shots. Lana?????