Preventing livestock diseases-rather than merely curing those that occur-is the businesslike approach to meat production. And your responsibility for disease control doesn't stop at your fenceline.
Herrick, John B.
"Livestock Disease Situation- 1960,"
Iowa Farm Science: Vol. 14
, Article 8.
Available at: http://lib.dr.iastate.edu/farmscience/vol14/iss7/8