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Table 1 Frequency of CVM-carriers grouped according to birth year for 228 Swedish Holstein bulls.

From: Effects of Complex Vertebral Malformation on Fertility in Swedish Holstein Cattle

Birth year of bull CVM-carriers N Frequency %
1995 0 0
1996 3 20.0
1997 18 21.7
1998 23 30.3
1999 9 18.0