P values (polynomial contrasts) | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Low protein quality | High protein quality | SEM | Interaction | Low protein quality | High protein quality | Protein concentration | Protein quality | ||||||||
36.7% | 45.0% | 56.1% | 36.2% | 43.3% | 54.9% | Lin. | Quadr. | Lin. | Quadr. | Lin. | Quadr. | ||||
Feed intake | 55.3 | 58.1 | 54.2 | 48.1 | 50.4 | 56.7 | 1.53 | 0.152 | – | – | – | – | 0.110 | 0.953 | 0.026 |
Renal excretion | |||||||||||||||
Ca | 0.25 | 0.36 | 0.39 | 0.34 | 0.25 | 0.24 | 0.04 | 0.463 | – | – | – | – | 0.265 | 0.404 | 0.141 |
P | 29.2 | 39.3 | 29.6 | 21.8 | 23.7 | 28.5 | 1.76 | 0.308 | – | – | – | – | 0.020 | 0.437 | 0.088 |
Mg | 0.32 | 0.19 | 0.15 | 0.18 | 0.13 | 0.17 | 0.02 | 0.265 | – | – | – | – | 0.098 | 0.251 | 0.239 |
K | 96.5 | 118 | 122 | 75.4 | 75.1 | 99.2 | 6.53 | 0.052 | – | – | – | – | 0.026 | 0.540 | 0.041 |
Na | 55.1 | 66.8 | 99.6 | 50.2 | 53.9 | 67.1 | 5.04 | 0.641 | – | – | – | – | 0.003 | 0.881 | 0.150 |
Ox | 1.68 | 1.86 | 1.59 | 1.27 | 1.22 | 1.26 | 0.07 | 0.499 | – | – | – | – | 0.702 | 0.484 | 0.013 |
Citrate | 5.40 | 7.48 | 6.20 | 7.53 | 4.48 | 4.83 | 0.64 | 0.629 | – | – | – | – | 0.333 | 0.186 | 0.922 |
Ammonium | 10.8 | 23.0 | 23.7 | 18.0 | 21.7 | 30.3 | 2.26 | 0.224 | – | – | – | – | 0.003 | 0.683 | 0.077 |
Creatinine | 33.6 | 38.6 | 40.8 | 32.9 | 36.3 | 41.6 | 0.90 | 0.164 | – | – | – | – | <0.001 | 0.802 | 0.543 |
Urea | 1.54 | 2.02 | 2.12 | 1.31 | 1.69 | 2.04 | 0.09 | 0.485 | – | – | – | – | <0.001 | 0.582 | 0.045 |
Sulphate | 23.0 | 32.5 | 35.7 | 24.1 | 30.9 | 44.7 | 1.61 | 0.014 | <0.001 | 0.251 | <0.001 | 0.047 | – | – | – |