Phytochemicals as alternatives to antibiotics against major pathogens involved in bovine respiratory disease(BRD)and bovine mastitis(BM).

Bovine respiratory disease (BRD) and bovine mastitis (BM) are the most common and costly infectious diseases in beef cattle and dairy cattle, respectively. In the current study, we evaluated the antimicrobial activity of seven phytochemicals against twelve BRD- and/or BMcausing bacterial pathogens. Our results show that allyl isothiocyanate, benzyl isothiocynate, cinnamaldehyde and eugenol are effective against most of the BRD- and/or BM-causing bacterial pathogens and could be repurposed as alternatives to antibiotics for the prevention/elimination of BRD and BM in feedlots.