Erratum to “Reproductive performance of early- and late-calving dairy cows artificially inseminated after ovulation synchronization and estrous resynchronization or artificially inseminated after observed estrus” (JDS Commun. 2:80–85)

The animal ethics statement was missing from this paper. The following statement should be included: “The project work was reviewed for ethical treatment of animals and approved by the Animal Care and Use Committee (ACUC) of the University of Missouri.”