Table 3.
Average values for total amino acid composition of sweet whey, ideal whey, and acid whey, determined by high-performance cation exchange.
| TAA g/kg Total Protein | Sweet Whey Powder | Ideal Whey Powder | Acid Whey Powder |
|---|---|---|---|
| Cysteic acid | 29.1 (±0.26) a | 32.8 (±1.34) b | 33.8 (±0.89) b |
| Taurine | 34.8 (±2.06) | 41.5 (±8.16) | 39.6 (±3.39) |
| Methionine Sulfone | 20.8 (±0.65) | 22.0 (±1.55) | 20.2 (±0.24) |
| Asparagine | 95.8 (±1.57) | 96.8 (±3.04) | 99.3 (±1.69) |
| Threonine | 60.0 (±2.32) b | 39.8 (±1.94) a | 40.3 (±1.08) a |
| Serine | 39.6 (±1.67) b | 33.4 (±2.22) a | 33.3 (±1.24) a |
| Glutamine | 152 (±8.50) | 145 (±8.61) | 150 (±10.2) |
| Glycine | 18.3 (±2.30) a | 19.6 (±1.23) b | 18.2 (±1.65) a |
| Alanine | 39.2 (±2.13) b | 34.0 (±3.97) a | 36.1 (±1.63) a,b |
| Cysteine | 22.2 (±1.98) a | 27.3 (±6.61) b | 22.7 (±7.52) a |
| Valine | 53.2 (±1.36) b | 47.2 (±4.30) a | 45.7 (±7.83) a |
| Isoleucine | 51.2 (±2.72) b | 41.0 (±3.02) a | 44.5 (±1.98) a |
| Leucine | 86.2 (±3.57) a | 94.2 (±3.77) b | 99.4 (±5.23) b |
| Tyrosine | 10.2 (±1.63) a | 13.2 (±0.64) b | 9.38 (±0.97) a |
| Phenylalanine | 23.4 (±0.77) a | 28.0 (±3.35) b | 29.0 (±1.80) b |
| Histidine | 26.4 (±1.57) a | 33.7 (±1.98) b | 39.0 (±2.96) c |
| Lysine | 73.7 (±2.51) | 72.6 (±4.81) | 78.2 (±3.63) |
| Arginine | 19.8 (±0.26) a | 24.1 (±0.82) b | 24.2 (±1.13) b |
| Proline | 42.3 (±6.69) b | 28.1 (±4.42) a | 25.8 (±4.25) a |
GRS—cows fed perennial ryegrass only. CLV—cows fed perennial ryegrass/20% white clover sward. TMR—cows fed indoor total mixed ration ad-libitum. a,b,c indicates values within a row not sharing a common superscript letter differed significantly (p < 0.05).