Milk weights were recorded automatically twice daily at milking through a conventional milking parlor (Boumatic Dairy Equipment Co.) and the data were automatically transferred and stored on Dairy Comp 305 software (Valley Agricultural Software, Tulare, CA). Health and production information was collected by the dairy herd personnel with the assistance of the herd veterinarian, and confirmed and recorded by the project leader using the on-farm Dairy Comp 305 software.