In cattle, the prevention of diseases might be possible using dietary methods, with nutritional
optimization of feed rations. For years significant influence has been associated with the addition of
biotin, methionine and zinc (each given individually, or as chelate – Zn-methionine). The aim of this
study was to evaluate the influence of biotin or biotin + Zn-methionine additives on the health and
performance of cows, in the first and second trimester of lactation.