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Table 4 Effect of diet characteristics on energy and nitrogen balances of growing pigs (Exp. 1)1

From: Net energy of corn, soybean meal and rapeseed meal in growing pigs

Item Corn SBM EP-RSM SE-RSM SEM P - value
BW, kg 40.2b 44.0a 44.1a 44.1a 0.9 0.01
DM intake, kg/d 1.33 1.34 1.37 1.40 0.02 0.07
Digestibility coefficients, %
 DM 90.4a 90.0a 87.3b 85.8b 0.7 <0.01
 CP 79.9b 88.0a 86.2a 85.1a 1.3 <0.01
 OM 90.4a 90.2a 87.7b 86.3b 0.7 <0.01
 GE 88.2a 88.3a 86.2ab 84.0b 0.8 <0.01
Nitrogen balance, g/d
 Intake 19.9d 37.0c 46.9b 50.4a 0.6 <0.01
 Fecal output 4.0b 4.5b 6.6a 7.5a 0.5 <0.01
 Urinary output 6.6b 10.6ab 15.5a 15.4a 1.4 <0.01
 Retention 9.4b 21.9a 24.8a 27.5a 1.2 <0.01
Energy utilization, %
 Urinary energy % of DE 1.8c 2.7b 3.4ab 3.9a 0.25 <0.01
 Methane energy, % DE 0.4 0.7 0.4 0.6 0.08 0.06
 ME/DE 97.8a 96.6b 96.2bc 95.5c 0.27 <0.01
 NE/ME 78.2 76.5 76.3 76.7 0.82 0.16
Energy balance, kJ/(kg BW0.6·d)
 ME intake, 2,273a 2,160bc 2,195b 2,120c 28 <0.01
 THP 1,259 1,308 1,268 1,250 25 0.15
 THPc2 1,232 1,317 1,265 1,271 22 0.08
 REP 3 152c 337b 381ab 424a 20 <0.01
 REL 4 862a 516b 546b 446b 34 <0.01
 RE 1,014a 852b 928b 870b 27 <0.01
 FHP 769 809 756 766 22 0.18
RQ
 Fed state 1.11a 1.05b 1.02b 1.03b 0.01 <0.01
 Fasted state 0.77 0.77 0.78 0.78 0.01 0.07
Energy values, MJ/kg DM
 DE 15.98a 16.10a 16.14a 15.42b 0.14 <0.01
 ME 15.64a 15.56a 15.52a 14.73b 0.13 <0.01
 NE 12.23a 11.90a 11.84ab 11.30b 0.15 <0.01
  1. 1A total 24 pigs were allotted to 1 of 4 dietary treatments with six pigs per diet and four periods, 16 d per period; SBM, soybean meal; EP-RSM, expelled press rapeseed meal; SE-RSM, solvent extracted rapeseed meal
  2. 2THPc means that total heat production was adjusted for comparable ME intake by covariance
  3. 3REP = Energy retention as protein [kJ/(kg BW0.6·d)] = [N intake (g) – N in feces (g) – N in urine (g)] × 6.25 × 23.86 (kJ/g)/BW0.6
  4. 4 REL = Energy retention as fat [kJ/kg BW0.6·d)]  = [RE (kJ) – energy retention as protein (kJ)]/BW0.6
  5. abcdMeans in the same row with differing superscripts differ (P < 0.05)