The use of bovine somatotropin (BST) in dairy herds has been shown to increase productivity levels. Bovine somatotropin is a biotechnology that, when injected in dairy cows, results in increased milk production levels anywhere from 10 to 40 percent (Kalter, et al.). Presently the injections are daily and have been shown to have a rather quick and dramatic increase in production levels.
Kliebenstein, James B. and Shin, Seung Y., "Impact of BovineSomatotropin (BST) on Dairy Produce" (1987). Economic Staff Paper Series. 7.