The Breed Cycle Manager (BCM) Settings control many of the calculations for scheduling future breeding events. 

For example, when you record a service event, the system will display a possible return to heat date, pregnancy scanning date, dry off and next calving date. 

These settings are also reflected on Reports > Quick Reports > Brayboard report.  
The main settings can be viewed/amended via Dairy Manager > Breed Cycle Manager > Settings.  The default values are as follows:

Parameter                                                  Default Value (Days)
Voluntary Waiting Period (VWP)                              42
Days Dry                                                                   60
Days to Scan                                                             40