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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

From: Estimation of genetic parameters and detection of chromosomal regions affecting the major milk proteins and their post translational modifications in Danish Holstein and Danish Jersey cattle

  Danish Holstein Danish Jersey
Trait2 Mean SD h2 (SE) Mean SD h2 (SE)
Protein% 3.43a 0.26 0.47 (0.19) 4.29b 0.32 0.70 (0.21)
Casein% 2.66a 0.12 0.43 (0.18) 3.00b 0.15 0.52 (0.19)
αs1-CN% 0.26a 0.03 0 (0.12) 0.27b 0.03 0.05 (0.10)
αs2-CN% 0.05a 0.01 0.14 (0.15) 0.06b 0.01 0.13 (0.14)
β-CN% 0.36a 0.03 0.05 (0.13) 0.28b 0.04 0.29 (0.16)
k-CN% 0.058a 0.01 0.77 (0.21) 0.069b 0.01 0.29 (0.17)
α-LA% 0.03a 0.01 0.40 (0.19) 0.02b 0.01 0.44 (0.19)
β-LG% 0.08a 0.02 0.58 (0.20) 0.06b 0.01 0.16 (0.13)
PTM3
8P-αs1-CN% 0.19a 0.02 0.01 (0.11) 0.21b 0.02 0.41 (0.21)
9P-αs1-CN% 0.07a 0.01 0.25 (0.18) 0.06b 0.01 0.23 (0.19)
11P-αs2-CN% 0.03a 0.01 0.21 (0.17) 0.04b 0.01 0.04 (0.15)
12P-αs2-CN% 0.019a 0.01 0.25 (0.15) 0.018b 0.005 0.19 (0.18))
G-k-CN% 0.014a 0.004 0.64 (0.20) 0.014a 0.004 0.14 (0.18)
U-k-CN% 0.044a 0.01 0.71 (0.20) 0.055b 0.01 0.27 (0.20)
Indices4
8P-αs1-CN/total αs1-CN2 0.73a 0.04 0.34 (0.19) 0.78b 0.05 0.56 (0.22)
11P-αs2-CN/total αs2-CN2 0.61a 0.06 0.54 (0.20) 0.67b 0.05 0.33 (0.19)
G-k-CN/total k-CN2 0.24a 0.06 0.50 (0.19) 0.20b 0.05 0.09 (0.15)
  1. 1 Details of the full data-set are presented in Poulsen et al. [32]
  2. 2 Protein and casein (CN) are expressed as percentage traits (g/100 g milk); αS1-CN, 8P-αS1-CN, 9P-αS1-CN, αS2-CN, 11P-αS1-CN, 12P-αS2-CN, β-CN, k-CN, G-k-CN, U-k-CN, α-lactalbumin and β-lactoglobulin are expressed as % of the total protein
  3. 3 PTM: post translational modification
  4. 4 Total αS1-CN comprises 8P-αS1-CN and 9P-αS1-CN; Total αS2-CN comprises 11P-αS2-CN and 12P-αS1-CN; Total k-CN comprises G-k-CN 1P and U-k-CN 1P
  5. a-b Mean with different superscript represent a significant difference in the mean (P < 0.05) between the Danish Holstein and Danish Jersey