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Table 4 Effects of supplementation with protein in different sites on the resident mass of fiber in the rumen, the fractional rates of NDF rumen dynamics, and on the characteristics of ruminal fermentation in cattle fed tropical forage

From: Intake, digestibility and nitrogen utilization in cattle fed tropical forage and supplemented with protein in the rumen, abomasum, or both

  Treatmentsc   
Itemd C R A R + A SEM P-value
Resident mass in the rumen
 NDF, g/kg BW 10.7 10.0 11.8 9.6 1.3 0.337
 iNDF, g/kg BW 8.4 8.0 9.2 8.3 1.0 0.821
NDF rumen dynamics
 ki, /h 0.060 0.071 0.052 0.063 0.008 0.238
 kp, /h 0.029 0.034 0.023 0.030 0.003 0.149
 kd, /h 0.030 0.037 0.029 0.034 0.005 0.338
Ruminal characteristics
 RAN, mg/dL 4.15b 13.66a 5.56b 8.22ab 1.91 0.078
 pH 6.83 6.75 6.79 6.72 0.12 0.914
 VFA, mmol/dL 5.321 5.396 5.731 5.940 0.279 0.256
 Acetate, mol/mol 73.71 73.40 75.25 74.06 0.87 0.489
 Propionate, mol/mol 18.76 19.08 17.74 19.32 0.79 0.559
 Butyrate, mol/mol 7.53 7.53 7.01 6.69 0.32 0.230
 A:P 3.96 3.86 4.29 3.84 0.22 0.501
  1. a, bwithin a row, means without a common superscript differ (P < 0.10)
  2. cControl = without supplementation; R = ruminal supplementation; A = abomasal supplementation
  3. d NDF neutral detergent fiber; iNDF indigestible neutral detergent fiber; ki, kp and kd rates of intake, passage and degradation; RAN rumen ammonia nitrogen; VFA volatile fatty acids; A:P acetate to propionate ratio