A Brakke study conducted among beef, dairy, swine and poultry producers in late 2016 found that vaccination protocols and improved sanitation were the top two strategies for 70 percent or more of all producers in response to the loss of shared use antibiotics.
Source: WattAgNet.com, January 12, 2017, (partial access).
The study found that, among the changes in feed additives, the most common was the increased use of direct-fed microbials, or probiotics. Other changes included increased use of enzymes, prebiotics, oligosaccharides, organic acids and phytogenics.