w8.5 million final lactation records since 1997
w2.8 million likely in progress
wCalving in 2004 or 2005
wTC not 3-7
w0.5 million sold for dairy (TC 2)
wTo herds not participating in DHIA testing
w4.0 million include disposal code (TC 3-7)
w1.2 million unknown disposition
wHerd discontinued DHIA testing (and TC 2 not used)
wDisposal not recorded or ambiguous