Skip to main content

Advertisement

Table 5 Effects of supplementation with protein in different sites on the characteristics of nitrogen utilization in the animals 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

  Supplementation sitee
Itemd Control R A R + A SEM P-value
SUN, mg/dL 7.29c 17.16a 13.46ab 13.39b 1.30 0.029
BAA, μmol/mg creatinine 113 123 129 119 12 0.485
Nitrogen intake, g/d 64.5b 103.8a 97.8a 98.0a 6.4 <0.001
Fecal nitrogen, g/d 34.0 36.0 35.5 33.4 4.0 0.611
Urinary nitrogen, g/d 26.3b 48.5a 40.4a 46.3a 4.2 0.010
Nitrogen balance, g/d 4.1b 19.3a 22.0a 18.3a 6.6 0.062
NBR, g/d −14.4c 12.2a −23.2c −2.0b 7.5 0.005
ENU       
g retained nitrogen/g of ingested nitrogen 0.04 0.18 0.22 0.18 0.05 0.165
g retained nitrogen /g of nitrogen absorbed in the intestines 0.07 0.27 0.35 0.27 0.04 0.402
PDI, g/d 280c 347bc 535a 416b 45 0.003
3-MH, mg/g of creatinine 50.8a 20.6b 29.6b 31.0b 13.1 0.077
UEUN, g/d 13.4b 28.9a 25.9ª 30.1a 2.9 0.002
UFK, g/d 42.9 ± 6.5b 60.9 ± 5.6a 43.9 ± 5.6b 55.0 ± 5.6a --- 0.062
FUEUN, g/g 0.35 ± 0.09 0.48 ± 0.08 0.63 ± 0.08 0.55 ± 0.08 --- 0.121
NMIC, g/d 53.1 ± 13.0 61.2 ± 11.1 61.9 ± 13.0 58.8 ± 11.1 --- 0.932
  1. a, b, cwithin a row, means without a commom superscript differ (P < 0.10)
  2. d SUN serum urea nitrogen; BAA amino acids in blood; NBR nitrogen balance in the rumen; ENU efficiency of nitrogen utilization; PDI protein digested in the intestine; 3-MH urinary excretion of 3-methyl histidine; UEUN urinary excretion of urea nitrogen; UFK urea nitrogen filtered in the kidneys; FUEUN fractional excretion of urea nitrogen; NMIC ruminal production of microbial nitrogen compounds
  3. eControl = without supplementation; R = ruminal supplementation; A = abomasal supplementation