Nihydrazone, a feed additive for chickens, has both antibacterial and antiprotozoal activity. It was found to be effective against coccidiosis due to Eimeria tenella and E. necatrix and it prevented an outbreak of cecal coccidiosis, reduced the incidence of "air sac infection," improved weight gains, feed conversions and livability and, in addition, it was active against fowl typhoid.