View Full Table | Close Full ViewTable 1.

Diet composition, Phase 1, as fed basis (fed from approximately 40 to 63 kg BW)

 
Dietary treatment
Item Control Narasin1 Zinc bacitracin2
Ingredient, %
    Corn 58.23 58.22 58.21
    Soybean meal 18.75 18.75 18.75
    DDGS3 20.00 20.00 20.00
    Fat, choice white grease 1.00 1.00 1.00
    Limestone 1.28 1.28 1.28
    Salt 0.40 0.40 0.40
    L-Lysine 0.25 0.25 0.25
    Vitamin premix4 0.04 0.04 0.04
    Trace mineral premix5 0.05 0.05 0.05
    Phytase6 0.01 0.01 0.01
    Narasin1 - 0.015 -
    Zinc bacitracin2 - - 0.025
    Total 100 100 100
Calculated composition
    ME, Mcal/lb 1.514 1.514 1.514
    CP, % 19.92 19.92 19.92
    Total Lys, % 1.09 1.09 1.09
    SID7 Lys, % 0.93 0.93 0.93
    Available P, % 0.35 0.35 0.35
    Ca, % 0.55 0.55 0.55
    SID Met + Cys:Lys 64.59 64.59 64.59
    SID Thr:Lys 64.21 64.21 64.21
    SID Try:Lys 18.08 18.08 18.08
    SID Ile:Lys 71.71 71.71 71.71
    SID Val:Lys 84.53 84.53 84.53
1Trade name: Skycis (Elanco Animal Health, Greenfield, IN); fed at 13.6 g/ton (15 mg/kg).
2Trade name: Albac (Zoetis, Parsippany, NJ); fed at 25 g/ton (28 mg/kg).
3DDGS = Distiller’s dried grains with solubles.
4Provided per kg of final diet: 6,600 IU vitamin A, 704 IU vitamin D3, 26 IU vitamin E, 4.9 mg riboflavin, 2.6 mg menadione, 0.02 mg vitamin B12, 16.5 mg D-pantothenic acid, and 29.7 mg niacin.
5Provided per kg of final diet: 66 mg iron, 66 mg zinc, 19.8 mg manganese, 66 mg copper, 14 mg iodine, and 0.12 mg selenium.
6Trade name: OptiPhos 2000 (Huvepharma, Sofia, Bulgaria).
7SID = Standardized ileal digestible.



View Full Table | Close Full ViewTable 2.

Diet composition, Phase 2, as fed basis (fed from approximately 63 to 86 kg BW)

 
Dietary treatment
Item Control Narasin1 Zinc bacitracin2
Ingredient, %
    Corn 61.40 61.38 61.37
    Soybean meal 15.75 15.75 15.75
    DDGS3 20.00 20.00 20.00
    Fat, choice white grease 1.00 1.00 1.00
    Limestone 1.15 1.15 1.15
    Salt 0.40 0.40 0.40
    L-Lysine 0.21 0.21 0.21
    Vitamin premix4 0.04 0.04 0.04
    Trace mineral premix5 0.05 0.05 0.05
    Phytase6 0.01 0.01 0.01
    Narasin1 - 0.015 -
    Zinc bacitracin2 - - 0.025
    Total 100 100 100
Calculated composition
    ME, Mcal/lb 1.517 1.517 1.517
    CP, % 18.73 18.73 18.73
    Total Lys, % 0.98 0.98 0.98
    SID7 Lys, % 0.83 0.83 0.83
    Available P, % 0.33 0.33 0.33
    Ca, % 0.50 0.50 0.50
    SID Met + Cys:Lys 69.24 69.24 69.24
    SID Thr:Lys 67.24 67.24 67.24
    SID Try:Lys 18.40 18.40 18.40
    SID Ile:Lys 74.55 74.55 74.55
    SID Val:Lys 89.05 89.05 89.05
1Trade name: Skycis (Elanco Animal Health, Greenfield, IN); fed at 13.6 g/ton (15 mg/kg).
2Trade name: Albac (Zoetis, Parsippany, NJ); fed at 25 g/ton (28 mg/kg).
3DDGS = Distiller’s dried grains with solubles.
4Provided per kg of final diet: 6,600 IU vitamin A, 704 IU vitamin D3, 26 IU vitamin E, 4.9 mg riboflavin, 2.6 mg menadione, 0.02 mg vitamin B12, 16.5 mg D-pantothenic acid, and 29.7 mg niacin.
5Provided per kg of final diet: 66 mg iron, 66 mg zinc, 19.8 mg manganese, 66 mg copper, 14 mg iodine, and 0.12 mg selenium.
6Trade name: OptiPhos 2000 (Huvepharma, Sofia, Bulgaria).
7SID = Standardized ileal digestible.



View Full Table | Close Full ViewTable 3.

Diet composition, Phase 3, as fed basis (fed from approximately 86 to 104 kg BW)

 
Dietary treatment
Item Control Narasin1 Zinc bacitracin2
Ingredient, %
    Corn 65.14 65.12 65.11
    Soybean meal 12.00 12.00 12.00
    DDGS3 20.00 20.00 20.00
    Fat, choice white grease 1.00 1.00 1.00
    Limestone 1.18 1.18 1.18
    Salt 0.40 0.40 0.40
    L-Lysine 0.20 0.20 0.20
    Vitamin premix4 0.04 0.04 0.04
    Trace mineral premix5 0.05 0.05 0.05
    Narasin1 - 0.015 -
    Zinc bacitracin2 - - 0.025
    Total 100 100 100
Calculated composition
    ME, Mcal/lb 1.517 1.517 1.517
    CP, % 17.25 17.25 17.25
    Total Lys, % 0.87 0.87 0.87
    SID6 Lys, % 0.73 0.73 0.73
    Available P, % 0.28 0.28 0.28
    Ca, % 0.50 0.50 0.50
    SID Met + Cys:Lys 74.12 74.12 74.12
    SID Thr:Lys 69.61 69.61 69.61
    SID Try:Lys 18.23 18.23 18.23
    SID Ile:Lys 76.37 76.37 76.37
    SID Val:Lys 92.99 92.99 92.99
1Trade name: Skycis (Elanco Animal Health, Greenfield, IN); fed at 13.6 g/ton (15 mg/kg).
2Trade name: Albac (Zoetis, Parsippany, NJ); fed at 25 g/ton (28 mg/kg).
3DDGS = Distiller’s dried grains with solubles.
4Provided per kg of final diet: 6,600 IU vitamin A, 704 IU vitamin D3, 26 IU vitamin E, 4.9 mg riboflavin, 2.6 mg menadione, 0.02 mg vitamin B12, 16.5 mg D-pantothenic acid, and 29.7 mg niacin.
5Provided per kg of final diet: 66 mg iron, 66 mg zinc, 19.8 mg manganese, 66 mg copper, 14 mg iodine, and 0.12 mg selenium.
6SID = Standardized ileal digestible.



View Full Table | Close Full ViewTable 4.

Diet composition, Phase 4, as fed basis (fed from approximately 104 kg BW to end of study)

 
Dietary treatment
Item Control Narasin1 Zinc bacitracin2
Ingredient, %
    Corn 84.48 84.46 84.45
    Soybean meal 12.50 12.50 12.50
    DDGS3 1.00 1.00 1.00
    Fat, choice white grease 0.25 0.25 0.25
    Monocalcium 1.00 1.00 1.00
    Limestone 0.50 0.50 0.50
    Salt 0.50 0.50 0.50
    L-Lysine 0.16 0.16 0.16
    L-Threonine 0.03 0.03 0.03
    Vitamin premix4 0.04 0.04 0.04
    Trace mineral premix5 0.05 0.05 0.05
    Phytase6 0.01 0.01 0.01
    Narasin1 - 0.015 -
    Zinc bacitracin2 - - 0.025
    Total 100 100 100
Calculated composition
    ME, Mcal/lb 1.539 1.539 1.539
    CP, % 13.11 13.11 13.11
    Total Lys, % 0.72 0.72 0.73
    SID7 Lys, % 0.63 0.63 0.63
    Available P, % 0.24 0.24 0.24
    Ca, % 0.47 0.47 0.47
    SID Met + Cys:Lys 67.01 67.01 67.01
    SID Thr:Lys 67.37 67.37 67.37
    SID Try:Lys 18.27 18.27 18.27
    SID Ile:Lys 70.43 70.43 70.43
    SID Val:Lys 84.67 84.67 84.67
1Trade name: Skycis (Elanco Animal Health, Greenfield, IN); fed at 13.6 g/ton (15 mg/kg).
2Trade name: Albac (Zoetis, Parsippany, NJ); fed at 25 g/ton (28 mg/kg).
3DDGS = Distiller’s dried grains with solubles.
4Provided per kg of final diet: 6,600 IU vitamin A, 704 IU vitamin D3, 26 IU vitamin E, 4.9 mg riboflavin, 2.6 mg menadione, 0.02 mg vitamin B12, 16.5 mg D-pantothenic acid, and 29.7 mg niacin.
5Provided per kg of final diet: 66 mg iron, 66 mg zinc, 19.8 mg manganese, 66 mg copper, 14 mg iodine, and 0.12 mg selenium.
6Trade name: OptiPhos 2000 (Huvepharma, Sofia, Bulgaria).
7SID = Standardized ileal digestible.



View Full Table | Close Full ViewTable 5.

Summary of housing conditions and marketing strategy of pigs sent for slaughter in a 3-phase marketing strategy

 
Item Housing conditions
Phase 1 (d 0 to 77)
    No. pigs/pen on d 0 25
    Feeder space, cm/pig 4.88
    Floor space, m2/pig 0.65
    Approximate % of pigs sent for slaughter/pen 20
    No. pigs remaining/pen on d 77 20
Phase 2 (d 77 to 91)
    No. pigs/pen on d 77 20
    Feeder space, cm/pig 6.10
    Floor space, m2/pig 0.81
    Approximate % of pigs sent for slaughter/pen 48
    No. pigs remaining/pen on d 91 8
Phase 3 (d 91 to 105)
    No. pigs/pen on d 91 8
    Feeder space, cm/pig 15.25
    Floor space, m2/pig 2.03
    Approximate % of pigs sent for slaughter/pen 32



View Full Table | Close Full ViewTable 6.

Effects of narasin1 or zinc bacitracin2 on the growth performance of finishing pigs sent for slaughter using a 3-phase marketing strategy

 
Dietary treatment
Item Control Narasin1 Zinc bacitracin2 SEM P-value
No. of pens 30 30 30 - -
Phase 1 (d 0 to 77)3
    No. pigs/pen 25 25 25 - -
    BW, kg
        d 0 (start) 44.0 44.2 43.9 1.09 0.60
        d 77 118.3b 119.5a 117.7b 0.48 0.01
    ADG, kg 0.96ab 0.97a 0.95b 0.020 0.01
    ADFI, kg 2.72a 2.74a 2.68b 0.018 0.01
    G:F 0.354 0.355 0.355 0.0051 0.54
Phase 2 (d 77 to 91)4
    No. pigs/pen 20 20 20 - -
    BW, kg
        d 77 116.4ab 117.5a 115.9b 0.55 0.04
        d 91 128.9 130.3 129.0 0.63 0.07
    ADG, kg 0.86 0.90 0.91 0.016 0.47
    ADFI, kg 3.05 3.10 3.05 0.077 0.30
    G:F 0.293 0.292 0.301 0.0048 0.14
Phase 3 (d 91 to 105)5
    No. pigs/pen 8 8 8 - -
    BW, kg
        d 91 122.2 124.6 123.0 0.96 0.13
        d 105 134.0 136.0 135.1 2.73 0.24
    ADG, kg 0.78 0.80 0.81 0.127 0.57
    ADFI, kg 3.16 3.27 3.22 0.091 0.14
    G:F 0.245 0.244 0.250 0.0332 0.63
    Overall (d 0 to end of test)
    BW, kg
        d 0 (start) 44.0 44.2 43.9 1.09 0.60
        End of test 133.0b 134.3a 133.0b 1.06 0.03
    ADG, kg 0.94b 0.95a 0.94b 0.024 0.04
    ADFI, kg 2.78ab 2.81a 2.76b 0.028 0.01
    G:F 0.339 0.340 0.342 0.0053 0.18
a,bMeans within a row with different superscripts are different (P < 0.05).
1Trade name: Skycis, Elanco Animal Health, Greenfield, IN.
2Trade name: Albac, Zoetis, Parsippany, NJ.
3Heaviest ∼20% of pigs sent for slaughter on d 77.
4Next heaviest 48% of pigs sent for slaughter on d 91.
5Final 32% of pigs sent for slaughter on d 105.



View Full Table | Close Full ViewTable 7.

Effects of narasin1 or zinc bacitracin2 on the carcass characteristics of finishing pigs sent for slaughter using a 3-phase marketing strategy

 
Dietary treatment
Item Control Narasin1 Zinc bacitracin2 SEM P-value
No. of pens 30 30 30 - -
Phase 1 (d 77)3
    End of test live weight, kg 129.3b 131.3a 128.6b 0.83 0.02
    HCW, kg 98.0b 99.8a 97.1b 0.89 0.004
    Carcass yield, % 75.8 76.0 75.7 0.21 0.25
    Predicted lean content, % 56.6 56.9 56.7 0.18 0.58
    LM depth, mm 77.4 78.9 77.1 0.59 0.11
    Backfat depth, mm - - - - -
Phase 2 (d 91)4
    End of test live weight, kg 133.4 134.1 133.1 0.65 0.32
    HCW, kg 101.1 102.2 101.1 0.62 0.07
    Carcass yield, % 75.8b 76.2a 75.9b 0.13 0.01
    Predicted lean content, % 56.9 56.9 57.0 0.13 0.55
    LM depth, mm 78.9 79.4 79.4 0.37 0.38
    Backfat depth, mm 18.4 18.7 18.3 0.31 0.39
Phase 3 (d 105)5
    End of test live weight, kg 134.0 136.0 135.1 2.73 0.24
    HCW, kg 101.4 103.3 102.4 1.71 0.16
    Carcass yield, % 75.6 76.0 75.8 0.27 0.22
    Predicted lean content, % 56.9 56.7 56.7 0.19 0.60
LM depth, mm 78.5 78.2 77.7 0.36 0.42
    Backfat depth, mm 18.3 18.7 18.4 0.64 0.69
Overall
    End of test live weight, kg 133.0b 134.3a 133.0b 1.06 0.03
    HCW, kg 100.7b 102.2a 100.9b 0.71 0.003
    Carcass yield, % 75.7b 76.1a 75.8b 0.10 0.01
    Predicted lean content, % 57.0 56.9 57.0 0.05 0.86
    LM depth, mm 78.6 78.9 78.5 0.22 0.41
    Backfat depth, mm 18.1 18.5 18.1 0.19 0.22
a,bMeans within a row with different superscripts are different (P < 0.05).
1Trade name: Skycis, Elanco Animal Health, Greenfield, IN.
2Trade name: Albac, Zoetis, Parsippany, NJ.
3Heaviest ∼20% of pigs sent for slaughter on d 77.
4Next heaviest 48% of pigs sent for slaughter on d 91.
5Final 32% of pigs sent for slaughter on d 105.