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Table 2 Distribution of typical and atypical lactation curves according to season of calving

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

Atypical lactation curve
Calving season Negative B Negative B and C Total No. typical curve X2
Spring 2994 1893 4887(26.91 %) 13,273(73.09 %)
Summer 3191 2156 5347(28.05 %) 13,711(71.95 %)
Autumn 2160 1354 3514(19.92 %) 14,120(80.08 %)
Winter 2366 1430 3796(20.97 %) 14,298(79.03 %)
Total 10,711 6833 17,544(23.96) 55,402(76.03) 2.11