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. 2019 May 15;97(7):3016–3026. doi: 10.1093/jas/skz169

Table 3.

Nitrogen retention variables and the lysine (Lys) efficiency in gestating gilts fed Lys limiting diets at early (day 48 to 52), mid- (day 75 to 79), and late (day 103 to 107) gestation

Variables Lys-1
60%		 Lys-2
70%		 Lys-3
80%		 Lys-4
90%		 SEM P-value
Linear Quadratic
Day 48 to 52
 No. of gilts 11 5 10 10
 Initial BW, kg 157.55 161.80 158.30 157.22 1.33
 Final BW, kg 164.35 167.96 166.34 163.44 1.40
 Nitrogen intake1, g/d 38.65 36.94 39.12 38.32 0.11 0.269
 SID Lys intake1, g/d 9.49 10.10 11.13 11.95 0.03 <0.001
 Nitrogen digestibility, % 82.46 82.76 84.05 82.72 0.21 0.210 0.040
 Urine nitrogen, g/d 20.53 21.59 23.33 22.81 0.61 0.043 0.455
 Nitrogen retention, g/d 11.34 9.01 9.55 8.89 0.67 0.122 0.456
 Whole-body Lys retention, g/d 4.70 3.73 3.95 3.69 0.28 0.128 0.448
 Lys efficiency, % 49.09 35.99 35.48 30.82 2.61 0.003 0.347
Day 75 to 79
 No. of gilts 11 8 9 10
 Initial BW, kg 173.73 174.25 175.44 170.40 1.58
 Final BW, kg 178.73 180.38 180.33 174.20 1.46
 Nitrogen intake1, g/d 37.16 37.99 38.32 37.48 0.06 <0.001
 SID Lys intake1, g/d 8.06 9.09 10.12 11.15 – <0.001
 Nitrogen digestibility, % 83.10 83.08 84.41 83.96 0.19 0.034 0.536
 Urine nitrogen, g/d 18.22 18.30 19.53 19.44 0.30 0.093 0.853
 Nitrogen retention, g/d 12.55 12.97 12.68 11.95 0.32 0.441 0.339
 Whole-body Lys retention, g/d 4.93 5.14 4.98 4.74 0.14 0.514 0.359
 Lys efficiency, % 61.35 56.93 49.41 42.62 1.42 <0.001 0.598
Day 103 to 107
 No. of gilts 11 7 9 10
 Initial BW, kg 190.72 191.45 190.40 187.80 1.55
 Final BW, kg 203.18 205.09 205.26 201.70 1.49
 Nitrogen intake1, g/d 44.12 44.37 44.10 45.01 0.05 <0.001
 SID Lys intake1, g/d 12.70 14.48 16.25 18.03 – <0.001
 Nitrogen digestibility, % 84.47 85.73 86.09 85.86 0.38 0.038 0.132
 Urine nitrogen, g/d 18.04 15.85 15.30 14.90 0.34 0.002 0.275
 Nitrogen retention, g/d 19.09 21.85 22.60 23.74 0.37 <0.001 0.291
 Whole-body Lys retention, g/d 7.11 8.28 8.61 9.17 0.15 <0.001 0.328
 Lys efficiency, % 55.96 57.20 52.97 50.87 1.03 0.037 0.406

1Daily feed allocation was set at 2.13 kg/d in early and mid-gestation and 2.53 kg/d in late gestation.