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. 2019 Dec 2;98(1):skz366. doi: 10.1093/jas/skz366

Table 6.

Effects of feeding strategies based on number of dietary phases (one, two, three, and four dietary phases) and lysine specifications (96%, 98%, and 100% of estimated requirements for growth rate) on growth performance of grow-finish pigs1,2

Item Experiment 1
Overall, days 0 to 117 Two-phase 100% Four-phase 100% Four-phase 96% Four-phase 96%/100% SEM P
 Initial BW, kg 27.9 27.9 27.9 27.9 0.79 <0.998
 Final BW, kg 129.9 129.8 127.2 129.4 1.09 <0.110
 ADG, kg 0.880a 0.876ab 0.855b 0.870ab 0.006 <0.044
 ADFI, kg 2.29 2.29 2.26 2.28 0.022 0.514
 G:F 0.385 0.382 0.379 0.381 0.003 0.202
Experiment 2
Overall, days 0 to 121 One-phase 100% Two-phase 100% Three-phase 100% Four-phase 100% SEM P
 Initial BW, kg 27.4 27.4 27.4 27.4 0.66 <0.951
 Final BW, kg 123.9y 126.2xy 125.5xy 126.7x 1.16 <0.051
 ADG, kg 0.797b 0.816a 0.814ab 0.822a 0.006 <0.007
 ADFI, kg 2.24 2.29 2.26 2.30 0.031 <0.126
 G:F 0.356 0.357 0.361 0.357 0.004 <0.398
Experiment 3
Overall, days 0 to 119 One-phase 98% Two-phase 98% Three-phase 98% Four-phase 98% SEM P
 Initial BW, kg 25.9 25.9 25.8 25.9 0.31 <0.997
 Final BW, kg 129.1b 131.6ab 131.8ab 133.4a 1.10 <0.022
 ADG, kg 0.862b 0.881ab 0.887ab 0.899a 0.008 <0.009
 ADFI, kg 2.29 2.29 2.31 2.29 0.024 <0.953
 G:F 0.376c 0.385b 0.385b 0.392a 0.002 <0.001
Experiment 4
Overall, days 0 to 114 Two-phase 98% Two-phase 98%/100% Three-phase 98% Four-phase 98% SEM P
 Initial BW, kg 28.7 28.9 28.9 28.9 0.47 <0.593
 Final BW, kg 128.8 130.3 130.9 129.6 1.05 <0.317
 ADG, kg 0.895 0.907 0.911 0.899 0.006 <0.215
 ADFI, kg 2.36 2.40 2.42 2.39 0.025 <0.305
 G:F 0.379 0.378 0.376 0.376 0.003 <0.765

1A total of four experiments were conducted at a commercial research facility with 1,100 to 1,188 pigs (PIC 359 × 1,050) per experiment in pens of 25 to 27 mixed-gender pigs per pen and 11 replicates per treatment. Experiments were conducted from ~27 to 127 kg BW for 120 d.

2Lysine specifications at 96%, 98%, and 100% of estimated requirements for growth rate were derived from the genetic supplier’s lysine requirement prediction equation based on commercial experiments (Genus PIC; Gonçalves et al., 2017). For 96%/100%, lysine specifications at 96% of estimated requirements were applied in growing (27 to 72 kg BW) and lysine specifications at 100% of estimated requirements were applied in finishing (72 to 127 kg BW). For 98%/100%, lysine specifications at 98% of estimated requirements were applied in growing-finishing (27 to 100 kg BW) and lysine specifications at 100% of estimated requirements were applied in late finishing (100 to 127 kg BW).

abcMeans with different superscripts are significantly different (P ≤ 0.05) in the row.

xyMeans with different superscripts have a tendency to be different (0.05 < P ≤ 0.10) in the row.