w8,682,138 lactation records from 4,375,938 Holstein cows calving since
January 1, 1997
wBest
prediction of persistency
wMilk
(M), fat (F), protein (P), SCS
wFloor
and ceiling of ± 4.0
wPhenotypic
reliability ≥ 50%
w1st - 5th lactations (1st required)