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Table 6 Nitrogen balance of growing-finishing pigs fed low protein diet supplemented with different amino acids (n = 6)

From: Effect of different dietary protein levels and amino acids supplementation patterns on growth performance, carcass characteristics and nitrogen excretion in growing-finishing pigs

Item HCP MCP (− 2 %) LCP(− 4 %) P 1 P 2
10 EAAs 10 EAAs 10 EAAs Lys, Met,Thr,
Trp
Lys, Met,Thr,
Trp, Ile
Lys, Met,Thr,
Trp, Val
Lys, Met,Thr,
Trp, Ile, Val
PhaseI (25–50 kg)
 N intake, g/d 53.00 ± 3.00x 48.23 ± 2.25x 40.72 ± 0.62yab 40.42 ± 3.06ab 34.40 ± 2.43b 42.97 ± 2.64a 41.04 ± 1.16ab <  0.01 0.08
 FN, g/d 6.56 ± 0.45x 6.32 ± 0.42x 4.79 ± 0.57y 5.67 ± 0.57 4.50 ± 0.42 5.92 ± 0.64 5.32 ± 0.11 0.04 0.27
 UN, g/d 10.12 ± 1.44x 7.28 ± 0.92x 4.04 ± 0.52y 6.87 ± 0.90 5.26 ± 1.20 4.82 ± 0.84 5.40 ± 0.88 <  0.01 0.28
 TN, g/d 16.69 ± 1.35x 13.60 ± 1.20x 8.83 ± 0.62yb 12.52 ± 1.05a 9.76 ± 1.17ab 10.74 ± 0.90ab 10.72 ± 0.86ab <  0.01 0.09
 RN, g/d 36.32 ± 2.44 34.62 ± 1.54 31.88 ± 0.93a 27.90 ± 2.16ab 24.64 ± 1.81b 32.23 ± 3.02a 30.31 ± 1.59ab 0.23 0.73
 N retention, % 68.42 ± 1.99y 71.94 ± 1.65y 78.26 ± 1.60xa 69.02 ± 0.96b 71.73 ± 2.26ab 74.23 ± 3.37ab 73.70 ± 2.35ab <  0.01 0.89
 N ABV, % 78.22 ± 2.51y 82.84 ± 1.76xy 88.73 ± 1.47xa 80.28 ± 1.77b 82.83 ± 3.10ab 86.69 ± 2.43ab 84.70 ± 2.61ab <  0.01 0.13
Phase II (50–75 kg)
 N intake, g/d 55.82 ± 2.32x 45.71 ± 4.21y 43.69 ± 0.58ya 41.45 ± 1.03ab 37.32 ± 2.96b 43.10 ± 1.48a 43.87 ± 1.93a <  0.01 0.09
 FN, g/d 8.53 ± 1.18 7.07 ± 0.71 6.62 ± 0.38 7.17 ± 0.36 5.70 ± 0.60 7.04 ± 0.59 6.65 ± 0.64 0.26 0.34
 UN, g/d 11.53 ± 1.89x 7.56 ± 1.20xy 5.98 ± 0.59y 6.12 ± 0.72 6.23 ± 0.41 7.49 ± 1.23 7.28 ± 0.72 0.03 0.53
 TN, g/d 20.06 ± 2.71x 14.62 ± 1.57xy 12.59 ± 0.43y 13.29 ± 0.59 11.93 ± 0.61 14.53 ± 1.24 13.93 ± 1.23 0.03 0.20
 RN, g/d 35.75 ± 2.73 31.06 ± 3.41 31.10 ± 0.85 28.16 ± 1.00 25.39 ± 2.48 28.58 ± 2.51 29.95 ± 1.82 0.32 0.29
 N retention, % 64.21 ± 4.19 67.68 ± 2.46 71.12 ± 1.20 67.89 ± 1.34 69.53 ± 1.48 65.71 ± 3.97 68.16 ± 2.45 0.27 0.60
 N ABV, % 75.54 ± 4.02 80.13 ± 2.85 83.84 ± 1.64 82.19 ± 1.92 79.67 ± 1.93 78.57 ± 4.12 80.20 ± 2.13 0.17 0.60
Phase III (75–100 kg)
 N intake, g/d 67.57 ± 1.57x 55.85 ± 2.94y 49.04 ± 1.65z 45.51 ± 0.96 47.42 ± 3.05 47.18 ± 2.80 47.11 ± 3.77 < 0.01 0.92
 FN, g/d 6.53 ± 0.37x 5.71 ± 0.52xy 5.12 ± 0.35y 5.43 ± 0.43 4.86 ± 0.45 4.50 ± 0.31 4.94 ± 0.37 0.07 0.54
 UN, g/d 17.49 ± 3.58x 14.18 ± 1.0xy 9.62 ± 0.98y 10.82 ± 1.68 9.79 ± 1.04 10.71 ± 2.15 10.80 ± 1.83 0.08 0.96
 TN, g/d 24.02 ± 3.80x 19.89 ± 1.10xy 14.74 ± 1.13y 16.25 ± 1.73 14.65 ± 1.39 15.20 ± 2.27 15.74 ± 2.05 0.05 0.96
 RN, g/d 43.54 ± 2.69x 35.96 ± 2.13y 34.30 ± 1.47y 29.26 ± 1.54 32.76 ± 3.58 31.97 ± 2.00 31.37 ± 2.50 0.02 0.68
 N retention, % 64.86 ± 4.73 64.33 ± 1.18 69.96 ± 1.92 64.40 ± 3.58 67.68 ± 5.06 68.22 ± 3.74 66.81 ± 2.81 0.41 0.86
 N ABV, % 71.78 ± 5.60 71.67 ± 1.45 78.06 ± 1.90 73.13 ± 4.04 75.36 ± 4.73 75.43 ± 4.23 74.88 ± 3.03 0.35 0.92
Phase IV (100–125 kg)
 N intake, g/d 63.49 ± 2.62x 50.22 ± 1.71y 43.62 ± 1.40z 44.61 ± 1.66 44.24 ± 1.89 44.34 ± 1.85 40.38 ± 4.96 <  0.01 0.77
 FN, g/d 5.21 ± 2.09 5.11 ± 2.70 4.14 ± 1.21 4.66 ± 2.02 4.89 ± 1.55 4.91 ± 2.42 4.16 ± 0.75 0.18 0.69
 UN, g/d 25.59 ± 0.48x 15.71 ± 0.36y 10.08 ± 0.42y 11.14 ± 0.44 9.89 ± 0.54 10.71 ± 0.40 11.69 ± 0.71 <  0.01 0.95
 TN, g/d 30.80 ± 2.15x 20.82 ± 3.02y 14.22 ± 1.09z 15.80 ± 1.93 14.77 ± 1.12 15.62 ± 2.67 15.85 ± 0.80 <  0.01 0.95
 RN, g/d 32.69 ± 2.03 29.40 ± 4.46 29.40 ± 1.55 28.80 ± 2.42 29.46 ± 1.41 28.73 ± 3.23 24.52 ± 4.64 0.62 0.73
 N retention, % 51.55 ± 2.65y 57.63 ± 7.82xy 67.33 ± 2.37x 64.40 ± 4.24 66.67 ± 2.01 64.53 ± 6.36 57.67 ± 6.55 0.07 0.64
 N ABV, % 56.18 ± 3.06y 63.88 ± 8.19xy 74.44 ± 2.84x 71.98 ± 4.99 75.38 ± 3.55 72.35 ± 6.68 64.32 ± 7.62 0.05 0.65
  1. FN, Fecal nitrogen; UN, Urine nitrogen; TN, Total nitrogen; RN, Retained nitrogen; ABV, Apparent biological value.
  2. P1 represented the P value of ANOVA among the HCP diet, MCPdiet and LCP diet with balancing 10 EAAs.
  3. P2 represented the P value of ANOVA among different amino acid balanced patterns of the LCP diets groups.
  4. a,bSuperscripts indicated differences among different amino acid balanced patterns of LCP diets groups.
  5. x,y,zSuperscripts indicate differences among different levels of dietary protein