Ruminants are animals like cattle, sheep and goats with a specialized stomach for fermenting food. Although microorganisms in this stomach can synthesize folate, there is a risk of insufficient supply when these animals are farmed as livestock. Addingfolic acid to feed can help regulate ruminants’ metabolism and production performance, especially during pregnancy and lactation. More attention needs to be paid to folic acid requirements and metabolic characteristics of ruminants to help healthy and efficient production management.