Table 1.

Phase 1 diet composition, experiment 1 (as-fed basis)¹

	Control, 21% CP		CP (%) with CWB
	Added ZnO	No added ZnO	21	19.5	18	16.5
Ingredient, %
Corn	44.35	44.80	41.45	45.40	48.90	52.30
Soybean meal, 46.5% CP	18.10	18.10	17.45	13.45	9.75	5.45
Dried whey	25.00	25.00	25.00	25.00	25.00	25.00
Fishmeal	4.50	4.50	4.50	4.50	4.50	4.50
CWB	—	—	4.00	4.00	4.00	4.00
Enzymatically treated soybean meal2	3.75	3.75	3.75	3.75	3.75	3.75
Soybean oil	1.50	1.50	1.50	1.50	1.50	1.50
Calcium carbonate	0.25	0.25	0.30	0.30	0.35	0.35
Monocalcium phosphate, 21% P	0.30	0.30	0.20	0.25	0.30	0.35
Salt	0.30	0.30	0.30	0.30	0.33	0.33
l-Lysine	0.43	0.43	0.44	0.47	0.49	0.56
dl-Methionine	0.23	0.23	0.22	0.21	0.20	0.21
l-Threonine	0.21	0.20	0.20	0.20	0.21	0.24
l-Tryptophan	0.07	0.07	0.07	0.08	0.08	0.10
l-Valine	0.14	0.14	0.14	0.15	0.17	0.20
l-Isoleucine	---	---	---	---	---	0.05
Trace mineral premix3	0.15	0.15	0.15	0.15	0.15	0.15
Vitamin premix4	0.25	0.25	0.25	0.25	0.25	0.25
Phytase5	0.08	0.08	0.08	0.08	0.08	0.08
Zinc oxide	0.40	---	---	---	---	---
Total	100	100	100	100	100	100
Calculated analysis
Standardized digestible (SID) amino acids, %
Lysine	1.40	1.40	1.40	1.33	1.25	1.20
Isoleucine:lysine	56	56	56	54	52	52
Leucine:lysine	109	110	108	107	106	102
Methionine:lysine	38	38	37	37	38	38
Methionine and cysteine:lysine	58	58	58	58	58	58
Threonine:lysine	65	64	64	64	64	64
Tryptophan:lysine	21.0	21.0	21.1	21.0	21.0	21.1
Valine:lysine	70	70	70	70	70	70
Total lysine, %	1.54	1.54	1.54	1.45	1.37	1.31
Metabolizable energy, kcal/kg	3,421	3,434	3,392	3,397	3,397	3,403
Net energy kcal/kg	2,578	2,589	2,552	2,574	2,594	2,620
SID lysine:net energy, g/Mcal	5.42	5.40	5.47	5.13	4.81	4.57
CP, %	21.0	21.0	21.0	19.5	18.0	16.5
Calcium, %	0.65	0.65	0.65	0.65	0.66	0.66
Phosphorus, %	0.64	0.64	0.65	0.64	0.63	0.63
Available phosphorus, %	0.55	0.55	0.54	0.55	0.55	0.56
STTD P, %6	0.56	0.56	0.56	0.56	0.56	0.56

¹Phase 1 diets were fed from days 0 to 7 (~5.6 to 6.7 kg).

²HP 300 (Hamlet Protein, Findlay, OH).

³Provided per kilogram of premix: 73 g Zn from Zn sulfate; 73 g Fe from iron sulfate; 22 g Mn from manganese oxide; 11 g Cu from copper sulfate; 0.2 g I from calcium iodate; 0.2 g Se from sodium selenite.

⁴Provided per kilogram of premix: 3,527,399 IU vitamin A; 881,850 IU vitamin D; 17,637 IU vitamin E; 1,764 mg vitamin K; 15.4 mg vitamin B12; 33,069 mg niacin; 11,023 mg pantothenic acid; 3,307 mg riboflavin.

⁵HiPhos 2700 (DSM Nutritional Products, Parsippany, NJ) provided an estimated release of 0.10% STTD P.

⁶Standardized total tract digestible phosphorus.