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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