View Full Table | Close Full ViewTable 1.

Diet composition of lactation diets for the evaluation of the standardized ileal digestible Trp:Lys ratio for lactating primiparous and multiparous sows. Ingredients are presented as percent inclusion in the diet and are reported on an “as-fed” basis

 
Ingredient, % SID Trp:Lys ratio
14 16 18 20
Corn 57.55 57.53 57.51 57.49
Dried distillers grain w/solubles 30.00 30.00 30.00 30.00
Soybean meal, 48% 8.63 8.63 8.63 8.63
Limestone 1.43 1.43 1.43 1.43
Monocalcium phosphate, 21% 0.63 0.63 0.63 0.63
Choice white grease 0.25 0.25 0.25 0.25
Salt 0.45 0.45 0.45 0.45
L-Lys HCl 0.60 0.60 0.60 0.60
L-threonine 0.15 0.15 0.15 0.15
L-Trp 0.01 0.03 0.04 0.06
VTM with phytase 0.23 0.23 0.23 0.23
Choline chloride 0.10 0.10 0.10 0.10
Planned composition
    ME, Mcal/kg 3.22 3.22 3.22 3.22
    CP, % 16.77 16.78 16.80 16.82
    Total Lys, % 1.11 1.11 1.11 1.11
    SID Lys, % 0.95 0.95 0.95 0.95
    Total Trp, % 0.17 0.19 0.21 0.23
    SID Trp, % 0.14 0.15 0.17 0.18
    SID M+C:Lys 0.71 0.71 0.71 0.71
    SID Thr:Lys 0.64 0.64 0.64 0.64
    SID Trp:Lys 0.14 0.16 0.18 0.20
    SID Val:Lys 0.67 0.67 0.67 0.67
1SID, Standardized ileal digestibility.
2HCl = Hydrochloride.
3Vitamin Trace Mineral (VTM) premix supplied per kilogram of diet: Vitamin A, 11,000 IU; vitamin D3, 1760 IU; vitamin E, 44.0 IU; vitamin K (menadione activity), 4.4 mg; riboflavin, 8.25 mg; D-pantothenic acid, 27.5 mg; niacin, 49.5 mg; vitamin B12,.04 mg; D-biotin,.22 mg; folic acid, 1.65 mg; pyridioxine, 5.1 mg; Zn (ZnSO4), 170 mg; Cu (CuSo4), 20 mg; Fe (FeSO4), 170 mg; Mn (MnSO4), 50 mg; I (ethylenediamine dihydriodide), 0.35 mg; and Se (Na2Se), 0.30 mg. Phytase was provided as Optiphos (Huevepharma, Sofia, Bulgaria) and added 750 phytase units/kg diet.
4Calculated from NRC (1998).
5M+C = Methionine + cysteine.



View Full Table | Close Full ViewTable 2.

Planned versus analyzed CP, total Lys and total Trp values of the low (14) and high (20) SID Trp:Lys diets. Analyzed values represented as total percentage in the diet

 
Item SID Trp:Lys ratio
14 20
Planned
    CP, % 16.77 16.82
    Total Lys, % 1.11 1.11
    Total Trp, % 0.17 0.23
    Total Trp:Lys 0.15 0.21
    SID Trp:Lys 0.14 0.20
Analyzed
    CP, % 16.51 16.64
    Total Lys 1.05 1.11
    Total Trp 0.16 0.21
    Total Trp:Lys 0.15 0.19
1SID = standardized ileal digestible.



View Full Table | Close Full ViewTable 3.

Evaluation of lactating primiparous and multiparous sow and litter performance as dietary SID Trp:Lys ratio increases in sow lactation diets

 
Parameter SID Trp:Lys Ratio
SEM Trt Parity Trt × Parity Linear Quadratic
14 16 18 20
Sow
    Number of sows 70 75 67 72
    Average parity, n 2.54 2.47 2.55 2.47 0.09 0.87
    Entry backfat, mm 14.2 13.6 14.1 13.3 0.6 0.63 0.31 0.13 0.40 0.88
    Weaning backfat, mm 10.9 10.5 10.5 10.0 0.4 0.45 0.69 0.95 0.12 0.92
    Backfat difference, mm 1.40 0.17 0.56 1.62 0.70 0.31 0.88 0.96 0.71 < 0.10
    Sow 48 h body weight, kg 194 195 194 193 4.4 0.99 < 0.01 0.95 0.82 0.86
    Lactation length, d 20.00 19.5 19.9 19.8 0.4 0.77 0.93 0.91 0.97 0.57
    ADFI, kg 5.11 5.28 5.24 5.21 0.06 0.21 < 0.01 0.77 0.35 < 0.10
    Weight change, % –3.13 –3.28 –2.27 –4.42 1.31 0.67 0.01 0.32 0.59 0.40
    Bred by 10 d, % 84.4 90.8 90.3 90.6 3.5 0.49 < 0.01 0.15 0.25 0.40
    Wean to Estrus, d 6.71 5.53 5.58 6.33 0.49 0.12 < 0.01 0.18 0.55 < 0.05
    Subsequent total born, n 12.6 12.5 13.1 13.2 0.7 0.81 0.65 0.74 0.41 0.86
Piglet
    Number of piglets started/sow, n 13.3 13.2 13.5 13.5 0.3 0.70 < 0.01 0.18 0.37 0.86
    Number of piglets weaned/sow, n 11.8 11.9 12.0 11.8 0.3 0.90 < 0.01 0.75 0.80 0.47
    Pig ADG, kg/d 0.205 0.210 0.211 0.212 0.005 0.75 < 0.01 0.22 0.30 0.68
    Daily litter ADG, kg/d 2.44 2.52 2.60 2.57 0.08 0.49 < 0.10 0.12 0.16 0.47
1SID = standardized ileal digestibility.
2Treatment.