Table 4.
Fecal and urinary P concentrations at different stages of lactation in cows fed diets differing in P content
| Item |
Dietary treatment
1
|
SEM |
P
2
|
||||
|---|---|---|---|---|---|---|---|
| LP | MP | HP | T | L | Q | ||
| Fecal P,% of DM |
|
|
|
|
|
|
|
| Peak lactation |
0.69 |
0.98 |
1.13 |
0.031 |
0.01 |
0.02 |
0.45 |
| Middle lactation |
0.52 |
0.70 |
1.00 |
0.102 |
0.03 |
0.04 |
0.39 |
| Late lactation |
0.74 |
1.03 |
1.15 |
0.085 |
0.02 |
0.02 |
0.26 |
| Urine P, mmol/L |
|
|
|
|
|
|
|
| Peak |
0.23 |
0.32 |
0.39 |
0.011 |
0.01 |
0.01 |
0.44 |
| Middle |
0.34 |
0.42 |
0.44 |
0.018 |
0.01 |
0.03 |
0.29 |
| Late | 0.36 | 0.44 | 0.50 | 0.008 | 0.01 | 0.04 | 0.30 |
1LP = low P; MP = medium P; and HP = high P.
2T, effect of treatment; L, linear effect; Q, quadratic effect.