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Table 1 Descriptive statistics of the data set after edits for the four traits studied

From: Two approaches to account for genotype-by-environment interactions for production traits and age at first calving in South African Holstein cattle

Region (code)

N

Mean (± SD)

Milk yield (kg)

Fat yield (kg)

Protein yield (kg)

Age at first calving (months)

Western Cape (1)

70,864

8119 ± 2513

297 ± 99

249 ± 80

26.6 ± 3.6

Eastern Cape (2)

40,559

6072 ± 1529

218 ± 59

194 ± 50

28.8 ± 3.7

Free State, Gauteng, North West and Limpopo (3)

75,388

7464 ± 2458

273 ± 93

237 ± 77

28.1 ± 4.0

KwaZulu Natal (4)

71,025

5894 ± 1461

211 ± 53

187 ± 45

28.6 ± 3.8

  1. N number of animals; SD standard deviation