Table 1.

Description of dietary treatments in terms of Zn and Cu sources and levels and phytase inclusion levels

Trt	Zn sources	Zn levels in phase 1, 2, and 3 diets, mg/kg	Cu sources	Cu levels in phase 1, 2, and 3 diets, mg/kg	Phytasec, FTU/kg
1	ZnO	2,000, 2,000, 100	CuSO4	150, 80, 80	0
2	ZnO	2,000, 2,000, 100	Cu-MHACb	150, 80, 80	0
3	Zn-MHACa	100, 100, 100	CuSO4	150, 80, 80	0
4	Zn-MHAC	100, 100, 100	Cu-MHAC	150, 80, 80	0
5	ZnO	2,000, 2,000, 100	CuSO4	150, 80, 80	500
6	ZnO	2,000, 2,000, 100	Cu-MHAC	150, 80, 80	500
7	Zn-MHAC	100, 100, 100	CuSO4	150, 80, 80	500
8	Zn-MHAC	100, 100, 100	Cu-MHAC	150, 80, 80	500

^aZn-MHAC represents Zn methionine hydroxy analogue chelate (MINTREX Zn), which is manufactured by Novus International Inc., St. Charles, MO.

^bCu-MHAC represents Cu methionine hydroxy analogue chelate (MINTREX Cu), which is manufactured by Novus International Inc., St. Charles, MO.

^cPhytase used in this study is a commercial feed-grade phytase (Quantum Blue, AB Vista, Marlborough, UK), with analyzed activity of 6,033 FTU/g.