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Table 3 Distribution of atypical lactation curves according to age at first calving

From: Effects of season and age at first calving on genetic and phenotypic characteristics of lactation curve parameters in Holstein cows

Calving month 19 20 21 22 23 24 25 26 27 28 29 30 31
Negative B 25 54 136 431 1481 2865 2751 1891 685 237 99 51 5
Negative B and C 21 39 90 293 983 1814 1737 1153 432 155 74 39 3
Total 46 (16 %) 93 (14 %) 226 (30 %) 724 (28 %) 2464 (25 %) 4679 (22 %) 4488 (22 %) 3044 (23 %) 1117 (24 %) 392 (28 %) 173 (34 %) 90 (40 %) 8 (19 %)