Ethnoveterinary medicine refers to the beliefs, knowledge, 
methods, practices and techniques used in the promotion of healthcare 
and well-being for animals. Since the 1940s, antibiotics were fed to 
livestock animals to boost their productivity by growing them bigger 
faster and at a cheaper price. Nonetheless, over the years many 
antibiotics which were once used successfully to attenuate or kill 
disease-causing microorganisms have now become inefficacious. 
Additionally, the number of antibiotic leads and novel antibiotics 
proposed by pharmaceutical companies has stalled considerably. Hence, 
there is an urgent need to provide newer classes of antibiotics or to 
derive modern strategies to combat disease-causing microorganisms. This 
chapter mentions 275 plant species used in different countries around 
the world to treat infectious ailments in animals. Plants listed in this
 chapter provide an indication of medicinal plants used in parts of 
Africa such as in South Africa and Uganda; in Asia such as in India, 
Nepal, Afghanistan and Pakistan; as well as in other countries such as 
Brazil and Iran. Interestingly, the results of in vitro studies provide 
valuable insights with respect to the antimicrobial properties of plants
 used in traditional medicinal systems over the world. These results can
 unlock diverse avenues for screening novel compounds, leads or even 
plant extracts that can be successfully developed as antimicrobial 
agents.
https://www.researchgate.net/publication/338329556_Alternative_Antimicrobials_Medicinal_Plants_and_Their_Influences_on_Animal_Infectious_Diseases