Table 1 Effects of weaning age and parity on ammonia, VFA, and pH in rumen fluid evaluated by two-way ANOVA on experimental d 140. Values are presented as Means with SD
From: Weaning age influences indicators of rumen function and development in female Holstein calves
Early-weaning | Late-weaning | p-values | |||||
|---|---|---|---|---|---|---|---|
Parameters | MC | PC | MC | PC | Weaning age W | Parity P | W*P |
Ammonia-N (mg/100 g) | 2.33 ± 1.25 | 1.91 ± 1.71 | 2.93 ± 2.07 | 2.52 ± 1.18 | 0.144 | 0.289 | 1 |
Acetate (mmol/L) | 35.89 ± 6.71 | 37.99 ± 8.23 | 36.15 ± 6.78 | 38.06 ± 5.88 | 0.971 | 0.278 | 0.917 |
Propionate (mmol/L) | 9.44 ± 1.91 | 10.42 ± 2.18 | 9.91 ± 2.38 | 10.65 ± 2.89 | 0.605 | 0.170 | 0.723 |
Butyrate (mmol/L) | 5.13 ± 1.67 | 5.76 ± 1.67 | 5.11 ± 1.50 | 5.52 ± 2.00 | 0.741 | 0.234 | 0.876 |
Iso-Butyrate (mmol/L) | 0.66 ± 0.15 | 0.74 ± 0.16 | 0.67 ± 0.15 | 0.74 ± 0.20 | 0.948 | 0.099 | 0.974 |
Valerate (mmol/L) | 0.70 ± 0.19 | 0.82 ± 0.21 | 0.74 ± 0.24 | 0.72 ± 0.22 | 0.630 | 0.337 | 0.238 |
Iso-Valerate (mmol/L) | 1.10 ± 0.52 | 1.36 ± 0.55 | 0.99 ± 0.22 | 1.15 ± 0.46 | 0.172 | 0.078 | 0.665 |
Total VFA (mmol/L) | 52.92 ± 10.25 | 57.10 ± 12.12 | 53.57 ± 10.23 | 56.84 ± 10.22 | 0.990 | 0.189 | 0.856 |
Ratio acetate:propionate | 3.84 ± 0.47 | 3.67 ± 0.44 | 3.74 ± 0.60 | 3.69 ± 0.56 | 0.781 | 0.435 | 0.643 |
pH | 7.34 ± 0.21 | 7.32 ± 0.27 | 7.35 ± 0.21 | 7.32 ± 0.17 | 0.857 | 0.684 | 0.960 |