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Table 3 Effect of urea plus nitrate pretreated rice straw (UN) and combination of UN and corn oil supplementation (UNCO) on apparent total-tract digestibility, N balance and methane emissions in goats

From: Effects of urea plus nitrate pretreated rice straw and corn oil supplementation on fiber digestibility, nitrogen balance, rumen fermentation, microbiota and methane emissions in goats

Items Treatment SEM P - value
Control UN UNCO
DMI, g/d 484b 501a 496ab 4.2 0.03
Apparent total-tract digestibility, g/kg
 DM 656b 666ab 674a 7.0 0.05
 OM 688b 711a 720a 10.5 < 0.001
 NDF 542b 577a 587a 11.1 < 0.001
 ADF 530 539 538 10.9 0.62
 CP 631 634 638 14.0 0.76
 GE 629b 641b 668a 12.1 < 0.001
Nitrogen balance
 N intake, g/d 8.41c 9.81a 9.13b 0.051 < 0.001
 Urinary N, g/d 2.94b 4.35a 3.32b 0.198 < 0.001
 Urinary N to N intake ratio, % 35.0b 44.3a 34.4b 2.19 < 0.001
 Fecal N, g/d 3.10b 3.60a 3.30b 0.141 < 0.001
 Fecal N to N intake ratio, % 36.9 36.6 36.2 1.39 0.77
 N excretion, g/d 6.05b 7.95a 6.62b 0.238 < 0.001
 N excretion to N intake ratio, % 71.9b 81.0a 72.5b 2.19 < 0.001
 N retention, g/d 2.36a 1.86b 2.51a 0.208 < 0.001
 N retention to N intake ratio, % 28.1a 19.1b 27.5a 2.40 < 0.001
Methane emissions
 g/d 9.91a 9.24ab 8.92b 0.779 0.04
 g/kg DMI 20.6a 18.5b 18.0b 1.59 0.03
 g/kg OM digested 32.8a 28.5b 27.3b 2.32 < 0.001
 g/kg NDF digested 76.3a 61.2b 63.7b 4.44 < 0.001
 % of GE intake 6.41a 5.69b 5.32b 0.481 0.004
  1. a-cMeans with different superscripts within a row are significantly different (P ≤ 0.05)