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Table 6 Ruminal fermentation variables in dairy cows fed 3 experimental diets

From: Effects of the dietary nonfiber carbohydrate content on lactation performance, rumen fermentation, and nitrogen utilization in mid-lactation dairy cows receiving corn stover

Itemsc Treatmentd SEM P-value
AH L-NFC H-NFC
pH 6.28 6.42 6.37 0.05 0.09
Ammonia nitrogen, mg/dL 21.4 23.7 21.1 0.85 0.06
Total VFA, mmol/L 120a 111ab 106b 3.08 0.02
Molar proportion, mmol/100 mmol
 Acetate 64.8 65.3 65.8 0.28 0.06
 Propionate 20.7a 19.7b 19.2b 0.32 0.02
 Butyrate 10.4 10.8 10.6 0.23 0.43
 Isobutyrate 0.96b 1.03a 1.07a 0.03 0.01
 Valerate 1.40 1.42 1.31 0.04 0.15
 Isovalerate 1.72 1.75 1.95 0.07 0.08
 Acetate: Propionate 3.15b 3.32ab 3.44a 0.06 0.02
  1. a-bLeast squares means within a row with different superscripts differ significantly (P < 0.05)
  2. cThe results are from rumen fluid samples collected 3 h post-feeding. VFA = Volatile fatty acids
  3. dAH = Total mixed rations containing alfalfa hay; L-NFC = Total mixed rations containing corn stover with a low content of non-fiber carbohydrates; H-NFC = Total mixed rations containing corn stover formulated to have similar non-fiber carbohydrate concentrations as the AH diet