The effect of the ratio of standardized ileal digestible lysine to metabolizable energy on growth performance, blood metabolites and hormones of lactating sows

Table 1 Ingredient composition and chemical analysis of diets containing 3.06 to 3.40 Mcal/kg of ME fed to sows in Exp. 1 (as fed basis)

	ME level, Mcal/kg
	3.06	3.16	3.20	3.25	3.30	3.40
Ingredient, %
Corn	60.00	64.00	64.01	63.01	61.52	64.01
Soybean meal (CP, 43%)	22.81	27.00	27.40	27.50	28.00	28.40
Wheat bran	13.00	5.00	4.00	4.00	4.00	0.00
Soybean oil	--	--	0.60	1.50	2.50	3.60
Limestone	1.64	1.64	1.64	1.64	1.64	1.64
Salt	0.60	0.60	0.60	0.60	0.60	0.60
Dicalcium phosphate	0.84	0.84	0.84	0.84	0.84	0.84
L-Lysine HCl (98%)	0.22	0.12	0.11	0.11	0.10	0.11
Methionine hydroxy analogue¹	0.04	--	--	--	--	--
L-Threonine (98.5%)	0.05	--	--	--	--	--
Vitamin-mineral premix²	0.80	0.80	0.80	0.80	0.80	0.80
Analyzed composition, %
Crude protein	17.46	17.44	17.48	17.88	17.94	17.89
Lysine	0.97	0.99	0.97	1.01	1.00	0.99
Threonine	0.66	0.67	0.65	0.66	0.68	0.67
Valine	0.80	0.84	0.84	0.83	0.86	0.84
Methionine + cysteine	0.56	0.57	0.57	0.58	0.57	0.56
Tryptophan	0.20	0.21	0.22	0.20	0.22	0.21
Calcium	0.96	0.97	0.97	0.97	0.97	0.97
Phosphorus	0.47	0.47	0.47	0.47	0.47	0.46
Calculated composition
ME, Mcal/kg³	3.06	3.16	3.20	3.25	3.30	3.40
SID-lysine, %⁴	0.86	0.86	0.86	0.86	0.86	0.86
SID-Lys:ME, g/Mcal	2.81	2.72	2.69	2.65	2.61	2.53

¹DL-methionine hydroxy analogue (84%) provided by Novus International, St. Louis, MO
²Premix supplied per kilogram of diet: Vitamin A, 12,000 IU; vitamin D₃, 2,000 IU; vitamin E, 24 IU; vitamin K₃, 2.0 mg; vitamin B₁, 2.0 mg; vitamin B₂, 6.0 mg; vitamin B₆, 4.0 mg; vitamin B₁₂, 24 μg; niacin, 30 mg; pantothenic acid, 20 mg; folic acid, 3.6 mg; biotin, 0.40 mg; choline, 0.40 g; iron, 96 mg; copper, 8.0 mg; zinc, 120 mg; manganese, 40 mg; iodine, 0.56 mg; selenium, 0.40 mg; and phytase, 120 mg
³The metabolizable energy content of corn, soybean meal, and wheat bran were determined previously in our laboratory (data not published). Metabolizable energy of soybean oil was obtained from the Agriculture Industry Standard of China (2004) and was calculated as 96% of DE
⁴Standardized ileal digestible lysine was determined previously using pigs surgically equipped with a T-cannula in the distal ileum. The basal ileal endogenous losses were measured by feeding a nitrogen-free diet (data not published)

ISSN: 2049-1891