Table 7.

Ash, calcium, phosphorus, and calcium to phosphorus ratio of white laying hens fed different sources and levels of trace minerals from 78 to 98 weeks of age.

Item	Ash, g	Bone mineral content
		Ca, mg	P, mg	Ash1, %	Ca1, %	P1, %	Ca:P
ZMCGly source	2.49B	159.2	73.2	0.51	15.9	7.32	2.18
ZMCAA source	2.62A	164.2	75.2	0.51	16.3	7.45	2.18
Low level	2.53	160.0	73.5	0.50	15.8	7.28	2.18
High level	2.58	163.7	74.9	0.51	16.4	7.49	2.19
P-value
Source	0.040	0.288	0.316	0.633	0.489	0.519	0.603
Level	0.449	0.448	0.532	0.062	0.217	0.288	0.484
Source × Level	0.579	0.688	0.966	0.004	0.985	0.712	0.121
SEM	0.031	2.15	0.91	0.023	1.21	7.387	0.006

Ca = calcium; P = phosphorus; Ca:P = calcium to phosphorus ratio; SEM = standard error of the mean.

ZMCGly = Zn, Mn, and Cu bis-glycinates.

ZMCAA = Zn, Mn, and Cu amino acid complexed minerals.

Low level = 20, 20, and 3.5 mg of Zn, Mn, and Cu, respectively.

High level = 40, 40, and 7 mg of Zn, Mn, and Cu, respectively.

^A,B Within a column, values with different letters differ significantly from the source by Tukey's test (P < 0.05).

¹Values based in tibia weight.