laclen specifies the length of the lactation for which calculations are being made. A value of 500 would indicate that 500-d yields should be calculated in addition to LTD, 305-d, and 365-d yields. The default is 305. A negative value will be set to 305.
laclen = 305
A Manual for Use of BESTPRED: A Program for Estimation of Lactation Yield and Persistency Using Best Prediction