Table 1.

Composition and nutrient levels of experimental diets (as-fed basis).

Items	Ca levels, %
	1.00		0.35
	NPP levels, %
	0.45	0.23	0.45	0.23
Ingredients, %
Corn	53.42	53.42	53.42	53.42
Soybean meal	38.10	38.10	38.10	38.10
Soybean oil	4.42	4.42	4.42	4.42
NaCl1	0.30	0.30	0.30	0.30
CaHPO41	1.82	0.50	-	0.50
Ca(H2PO4)21	-	-	1.36	-
Limestone1	1.32	2.00	-	0.23
DL-Methionine1	0.30	0.30	0.30	0.30
Premix2	0.32	0.32	0.32	0.32
Sand3	-	0.64	1.79	2.41
Nutrient composition, %
Metabolizable energy, MJ/kg	12.6	12.6	12.6	12.6
Crude protein4	22.42	22.11	22.17	22.07
Lysine	1.12	1.12	1.12	1.12
Methionine	0.61	0.61	0.61	0.61
Methionine + Cysteine	0.90	0.90	0.90	0.90
Ca4	0.95	0.97	0.36	0.34
Total P4	0.69	0.48	0.71	0.46
Non-phytate P (NPP)4	0.41	0.27	0.43	0.24

¹Feed grade.

²Provided per kilogram of diets: 15,000 IU vitamin A (all-retinol acetate); 4,500 IU cholecalciferol; 24 IU vitamin E (all-rac-α-tocopherol acetate); 3 mg vitamin K (menadione sodium bisulfate); 3 mg thiamin (thiamin mononitrate); 9.6 mg riboflavin; 3 mg vitamin B₆; 0.018 mg vitamin B₁₂; 15 mg pantothenic acid calcium; 39 mg niacin; 1.5 mg folic acid; 0.15 mg biotin; 700 mg choline (choline chloride); 8 mg Cu (CuSO₄·5H₂O); 110 mg Mn (MnSO₄·H₂O); 40 mg Fe (FeSO₄·H₂O); 60 mg Zn (ZnSO₄·H₂O); 0.35 mg I (KI); 0.15 mg Se (Na₂SeO₃); 50 mg chlorotetracy cline.

³Washed building sand without Ca and P, which was used to adjust amounts of CaHPO₄, Ca(H₂PO₄)₂ and limestone.

⁴Analyzed values. Each value based on triplicate determinations. The others were calculated values.