0                           10                           15                          20                         30

Seconds after application

Disinfectants need time to kill bacteria, although they do not completely eliminate them. These products may be applied externally on the animal body (antiseptics), or on milking equipment (disinfectants).


Medications administered

to the cow to kill disease

causing bacteria.

They do not kill either virus

or fungi, and need several

days of action to achieve

good results.

Antibiotics do not differentiate among “good” and “bad” bacteria, thus, they also kill benign bacteria. In such a case, the body of the cow may not be strong enough to fight new infections.


• Extended use, or poor antibiotic selection lead to development of antibiotic resistance. Poor selection also favor the development of bacteria resistant to antibiotic.

• Antibiotics can destroy benign digestive flora. These good bacteria are important for digestion processes.

• In mild cases, the cow can fight the infection on her own without antibiotics.

• Antibiotics contaminate milk, and that is hazardous to consumers.

Extra-label use of antibiotics is restricted to veterinarians to determine what, how, when and the appropriated dosage of antibiotic to be used.




Developed by Humberto Rivera, MS., supported by the program “A Mexican-U.S. Dairyland Partnership Between Queretaro and Wisconsin: Dairy Training Research, and Extension for Economic Development and Trade”.