Table 5.

Effects of GEN on serum metabolites and bone indexes of LBB hens (n = 8).

	Serum				Tibia
Treatment	ALP	Ca	P	CT	TBS	Ca	Mg	P
A	230 ± 33b	4.31 ± 0.14b	1.86 ± 0.28	35.96 ± 2.21b	478 ± 45b	20.0 ± 1.2c	2.67 ± 0.33	84.9 ± 5.8b
B	250 ± 37b	4.75 ± 0.23a	1.88 ± 0.30	35.90 ± 2.01b	533 ± 58ab	28.8 ± 1.0b	2.43 ± 0.55	82.6 ± 8.8b
C	352 ± 79a	4.79 ± 0.35a	2.20 ± 0.28	83.79 ± 7.67a	676 ± 94a	31.9 ± 2.7a	2.56 ± 0.36	100.5 ± 19.0a
P-value	0.041	0.009	0.082	0.005	0.001	<0.001	0.678	0.053

Data are presented as mean value ± SD. Mean values without the same mark (a, b) represent statistically significant differences (P < 0.05). Alkaline phosphatase (ALP, U/L), calcitonin (CT, pg/mL), calcium in serum (Ca, mg/dL), phosphorus in the serum (P, mg/dL), tibia breaking strength (TBS, kg/cm²), calcium in tibia (Ca, %ash), magnesium (Mg, % ash), phosphorus in the bone (P, % ash).