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Table 3 Lactation performance 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

Items Treatmentd SEM P-value
AH L-NFC H-NFC
DM intake, kg/d 21.9a 21.5a 20.1b 0.44 < 0.01
Milk yield, kg/d 24.8a 23.2b 22.8b 0.76 < 0.01
ECMe, kg/d 27.7 27.0 26.4 1.01 0.20
Milk composition, %
 Fat 3.90b 4.25a 4.11a 0.12 < 0.01
 Protein 3.48 3.52 3.50 0.06 0.56
 Lactose 5.00 4.95 4.98 0.06 0.11
 Total solid 12.6b 12.9a 12.8ab 0.17 < 0.01
 Milk urea nitrogen, mg/dL 18.1b 20.3a 18.3b 0.72 < 0.01
Feed efficiency, kg/kg
 Milk/DM intake 1.15a 1.08b 1.15a 0.03 < 0.01
 ECM/DM intake 1.28 1.27 1.32 0.04 0.16
 Somatic cell count, ×103/mL 94.8 64.2 70.6 20.6 0.26
 Feed cost per kg milk, $/kg 0.342a 0.331b 0.319c 0.01 < 0.01
  1. a-cLeast squares means within a row with different superscripts differ significantly (P < 0.05)
  2. 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
  3. eECM = Energy-corrected milk. ECM (kg) = 0.3246 × milk yield (kg) + 13.86 × fat yield (kg) + 7.04 × protein yield (kg) [39]