Table 1 Mean values, phenotypic standard deviations and heritabilities for milk protein fractions as well as individual milk proteins and their isoforms in Danish Holstein (n = 371) and Danish Jersey (n = 321) cows¹

Protein%

3.43^a

0.26

0.47 (0.19)

4.29^b

0.32

0.70 (0.21)

Casein%

2.66^a

0.12

0.43 (0.18)

3.00^b

0.15

0.52 (0.19)

α_s1-CN%

0.26^a

0.03

0 (0.12)

0.27^b

0.03

0.05 (0.10)

α_s2-CN%

0.05^a

0.01

0.14 (0.15)

0.06^b

0.01

0.13 (0.14)

β-CN%

0.36^a

0.03

0.05 (0.13)

0.28^b

0.04

0.29 (0.16)

k-CN%

0.058^a

0.01

0.77 (0.21)

0.069^b

0.01

0.29 (0.17)

α-LA%

0.03^a

0.01

0.40 (0.19)

0.02^b

0.01

0.44 (0.19)

β-LG%

0.08^a

0.02

0.58 (0.20)

0.06^b

0.01

0.16 (0.13)

8P-α_s1-CN%

0.19^a

0.02

0.01 (0.11)

0.21^b

0.02

0.41 (0.21)

9P-α_s1-CN%

0.07^a

0.01

0.25 (0.18)

0.06^b

0.01

0.23 (0.19)

11P-α_s2-CN%

0.03^a

0.01

0.21 (0.17)

0.04^b

0.01

0.04 (0.15)

12P-α_s2-CN%

0.019^a

0.01

0.25 (0.15)

0.018^b

0.005

0.19 (0.18))

G-k-CN%

0.014^a

0.004

0.64 (0.20)

0.014^a

0.004

0.14 (0.18)

U-k-CN%

0.044^a

0.01

0.71 (0.20)

0.055^b

0.01

0.27 (0.20)

8P-α_s1-CN/total α_s1-CN²

0.73^a

0.04

0.34 (0.19)

0.78^b

0.05

0.56 (0.22)

11P-α_s2-CN/total α_s2-CN²

0.61^a

0.06

0.54 (0.20)

0.67^b

0.05

0.33 (0.19)

G-k-CN/total k-CN²

0.24^a

0.06

0.50 (0.19)

0.20^b

0.05

0.09 (0.15)