Table 3.
Free AA content (mg/100 g) of milk from the different lactation periods.
| Lactation Period | |||||
|---|---|---|---|---|---|
| 5–11 Days | 12–30 Days | 1–2 Months | 2–4 Months | 4–8 Months | |
| IAA † | |||||
| Histidine | 0.29 (0.21) | 0.42 § (0.23) | 0.33 § (0.15) | 0.33 (0.19) | 0.28 (0.10) |
| Isoleucine | 0.17 (0.11) | 0.19 (0.13) | 0.13 § (0.10) | 0.13 (0.07) | 0.15 § (0.07) |
| Leucine | 0.33 (0.20) | 0.4 (0.2) | 0.34 § (0.14) | 0.33 (0.14) | 0.34 (0.15) |
| Lysine | 0.61 (0.51) | 0.56 § (0.28) | 0.46 § (0.20) | 0.42 § (0.23) | 0.54 § (0.28) |
| Methionine | 0.11 (0.07) | 0.13 (0.13) | 0.10 § (0.07) | 0.07 § (0.06) | 0.12 § (0.05) |
| Phenylalanine | 0.31 (0.17) | 0.40 (0.17) | 0.32 § (0.17) | 0.33 (0.17) | 0.30 (0.12) |
| Threonine | 0.69 (0.38) | 0.69 (0.36) | 0.70 (0.36) | 0.78 (0.34) | 0.85 (0.38) |
| Valine | 0.58 (0.27) | 0.70 § (0.30) | 0.61 § (0.21) | 0.59 (0.21) | 0.59 (0.18) |
| DAA † | |||||
| Alanine | 1.26 (0.81) | 1.75 § (0.79) | 2.07 § (0.67) | 1.93 (0.68) | 1.85 (0.46) |
| Arginine | 0.46 (0.49) | 0.42 § (0.28) | 0.25 § (0.22) | 0.25 (0.19) | 0.25 (0.13) |
| Asx ‡ | 0.47 (0.36) | 0.52 (0.30) | 0.54 (0.35) | 0.55 (0.38) | 0.58 (0.40) |
| Cystine | 0.32 (0.13) | 0.49 § (0.21) | 0.46 (0.17) | 0.49 (0.21) | 0.50 (0.15) |
| Glx ‡ | 10.89 (9.89) | 15.09 § (8.74) | 18.03 § (7.17) | 20.22 § (7.28) | 19.36 (8.07) |
| Glycine | 0.51 (0.29) | 0.62 § (0.23) | 0.68 § (0.25) | 0.64 (0.28) | 0.76 § (0.28) |
| Proline | 0.56 (0.33) | 0.40 § (0.28) | 0.54 (0.29) | 0.40 (0.31) | 0.45 § (0.44) |
| Serine | 0.72 (0.43) | 0.85 § (0.36) | 0.91 § (0.40) | 1.11 § (0.63) | 1.11 (0.43) |
| Taurine | 2.26 (2.65) | 1.91 (1.78) | 1.94 (1.31) | 1.87 (1.42) | 2.03 (1.12) |
| Tyrosine | 0.38 (0.26) | 0.40 (0.20) | 0.28 § (0.17) | 0.25 (0.14) | 0.28 § (0.13) |
| SUM | 20.1 (12.5) | 25.5 § (10.4) | 27.4 § (8.0) | 29.0 (9.7) | 28.6 (10.7) |
† IAA = indispensable amino acids; DAA = dispensable amino acid; ‡ Asx = sum of aspartic acid + asparagine; Glx = sum of glutamic acid + glutamine. Medians (inter-quartile ranges) of n = 90 samples per lactation period are shown. A median with a “§” superscript is significantly different from the median of the previous lactation period (p < 0.05).