Table 6.

Effects of MHA-Zn on apparent retention of trace element and nutrients of aged laying hens.¹

	Experimental treatment
Items	80 mg/kg ZnSO4	20 mg/kg MHA-Zn2	40 mg/kg MHA-Zn	80 mg/kg MHA-Zn	P-Value
Apparent retention of nutrients (%)
Energy	69.89 ± 0.95c	71.89 ± 0.72b	74.24 ± 1.26a	74.57 ± 0.46a	<0.001
CP	69.70 ± 0.98b	69.37 ± 0.94b	70.11 ± 1.90a	72.03 ± 1.19a	0.002
Ca	50.95 ± 1.20b	51.65 ± 2.15b	53.70 ± 3.44a,b	54.56 ± 2.84a	0.041
P	51.31 ± 2.78	51.03 ± 2.27	51.93 ± 2.70	51.66 ± 3.60	0.928
Apparent retention of trace elements (%)
Cu	32.21 ± 7.11b	41.31 ± 7.29a	44.97 ± 8.27a	42.32 ± 5.65a	0.014
Fe	20.63 ± 3.46	22.21 ± 2.00	21.80 ± 4.92	22.16 ± 4.52	0.865
Mn	15.40 ± 2.55	16.91 ± 4.76	17.21 ± 4.89	16.73 ± 4.24	0.884
Zn	11.14 ± 5.09b	14.80 ± 2.92a,b	19.21 ± 5.40a	16.43 ± 6.27a,b	0.086

¹Data represent the means from 8 replicates per treatment. Values are the means ± SD.

²MHA-Zn: methionine hydroxy analog chelate zinc.

^a–cMeans with different superscripts within the same row are significantly different (P < 0.05).