The use of feed-grade amino acids in lactating sow diets

Table 1 Diet composition of lactation diets varying in L-lysine HCl, Exp. 1 (as-fed)

	Diet
Ingredient, %	1	2	3	4	5
Corn	57.49	59.20	61.49	63.29	65.44
Soybean meal, 46%	34.71	32.77	30.44	28.51	26.18
Choice White Grease	4.00	4.00	4.00	4.00	4.00
Monocalcium phosphate 21%	1.70	1.70	1.70	1.70	1.75
Limestone	1.25	1.25	1.25	1.25	1.25
Salt	0.50	0.50	0.50	0.50	0.50
Vitamin/trace mineral/phytase^a	0.25	0.25	0.25	0.25	0.25
Choline chloride	0.10	0.10	0.10	0.10	0.10
L-lysine HCl	0.000	0.075	0.150	0.225	0.300
L-threonine	0.000	0.035	0.0675	0.103	0.135
HMTBa^b	0.000	0.025	0.050	0.075	0.100
Calculated Nutrients Composition
ME, Mcal/kg^c	3.450	3.452	3.454	3.456	3.456
Crude protein, %	21.0	20.4	19.6	18.9	18.1
SID^d Lys, %	1.06	1.07	1.07	1.08	1.08
SID M + C^e, %	0.62	0.62	0.62	0.63	0.63
SID Thr, %	0.70	0.71	0.71	0.71	0.71
SID Trp, %	0.23	0.22	0.21	0.19	0.18
SID Val, %	0.89	0.86	0.81	0.79	0.75
g SID Lys/Mcal NRC ME	3.07	3.09	3.09	3.12	3.12
SID M + C:Lys	0.58	0.58	0.58	0.58	0.58
SID Thr:Lys	0.66	0.66	0.66	0.66	0.66
SID Trp:Lys	0.22	0.21	0.20	0.18	0.17
SID Val:Lys	0.84	0.80	0.76	0.73	0.69

^aPremix supplied per kilogram of diet: vitamin A, 11,000 IU; vitamin D₃, 1760 IU; vitamin E (DL-alpha tocopheryl acetate), 66 IU; vitamin K (menadione activity), 3.96 mg; riboflavin, 8.25 mg; D-pantothenic acid, 29.70 mg; niacin, 49.5 mg; vitamin B₁₂, 0.04 mg; D-Biotin, 0.22 mg; folic acid, 1.65 mg; pyridoxine, 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 (Na₂SeO₃), 0.30 mg. Phytase was provided as Optiphos (Huevepharma, Sofia, Bulgaria) and added 750 phytase units/kg diet
^bALIMET is a trademark of Novus International, Inc., and is registered in the United States and other countries. Methionine source. 88% 2-hydroxy, 4-methylthio butanoic acid, HMTBa
^cCalculated from NRC (1998)
^dSID = Standardized ileal digestible
^eM + C = Methionine + cysteine

ISSN: 2049-1891