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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