rooster booster poultry cell

I bought a rooster booster poultry cell. I was bring to home and open a cap, found a half seal is broken. Is it still safe to use??

Four days ago, my husband had found that one of our free-ranging chickens, who we have had for over 6 months, had been attacked by a fox. The fox was small and took our smallest chicken. The fox must have been scared off by our neighbors dogs, because the fox left our little lady in a pile of...