Table 6.
Effect of dietary Lys concentrations on end of finishing (day 179) physiological free essential amino acid profile and urea N in plasma of beef steers
| Treatment | P-value | ||||
|---|---|---|---|---|---|
| CON† | POS‡ | RPL|| | SEM$ | Trt | |
| Plasma urea N, mg/dL | 10.7b | 12.5a | 11.0b | 0.53 | 0.04 |
| Essential AA, µg/mL | |||||
| Arginine | 16.5 | 15.5 | 17.1 | 0.98 | 0.44 |
| Histidine | 12.7 | 11.7 | 12.0 | 0.49 | 0.37 |
| Isoleucine | 14.5 | 15.6 | 14.0 | 0.95 | 0.41 |
| Leucine | 26.8 | 26.9 | 26.7 | 1.79 | 0.99 |
| Lysine | 17.8 | 16.5 | 16.8 | 1.11 | 0.66 |
| Methionine | 4.9 | 4.2 | 4.8 | 0.30 | 0.22 |
| Phenylalanine | 10.3 | 9.7 | 10.2 | 0.40 | 0.46 |
| Threonine | 8.5 | 9.1 | 9.0 | 0.63 | 0.72 |
| Tryptophan | 8.7 | 8.7 | 8.5 | 0.41 | 0.90 |
| Valine | 31.8 | 36.8 | 33.5 | 2.16 | 0.26 |
†CON—diet formulated to be deficient in Lys.
‡POS—diet formulated to meet Lys requirements through feedstuffs.
||RPL—diet formulated to meet Lys requirements through AjiPro-L (Ajinomoto Animal Nutrition North America, Eddyville, IA).
$Standard error of the mean.
a,bMeans with different superscripts in the same row differ (P ≤ 0.05).
y,zMeans with different superscripts in the same row tend to differ (0.05 < P ≤ 0.10).