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Table 5.
Effect of different N sources on N balance, excretion of urinary derivatives (PD), and microbial crude protein supply.
Dietary treatments
SEM
Control SBM U-Cal U-Cas
Nitrogen balance, g/d
N intake 104.3 108.5 106.2 109.1 2.99
Faecal N 21.3 18.6 17.6 17.4 3.36
Urinary N 30.5 24.3 23.1 22.4 7.51
N absorption 83.0 89.9 88.6 91.7 5.85
N retention 52.5a 65.6b 65.5b 69.3b 4.11
PD, mmol/d
Allantoin excretion 127.6a 165.8b 163.9b 216.0c 2.07
Allantoin absorption 115.7a 161.1b 158.7b 189.2c 6.65
Microbial crude proteind, g/d 436.5a 567.7b 561.0b 736.3c 10.32
EMNSe, gN/kg OMDR 12.9a 14.4b 15.2b 18.2c 0.39