The Peak Milk and DIM items in BoviSync Animals Reports are lookups based on current lactation test information. Essentially, when an animal is tested at 100 days or greater in milk the highest test day milk between 30 DIM and 150 DIM for the current lactation is reported along with the DIM for that test.  Please be aware that there will be a small amount of bias when looking at PEAK items aggregated groups of animals before 150 DIM.

Here is a graph of Peak Milk by Peak DIM, all values occur between 30 and 150 DIM:

 Here is an animal report for animals showing when the Peak Values are reported for animals by DIM at Testday: