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. 2019 Dec 30;99(1):454–462. doi: 10.3382/ps/pez530

Table 5.

Effects of dietary zinc (Zn) supplementation on the tibial characteristics of duck breeders in the laying period (21 to 40 wk).

	Zn supplemental levels (mg/kg) ¹							P-value
Variables	0	10	20	40	80	160	SEM	ANOVA	Linear	Quadratic
Breaking strength (N)	127	141	146	158	150	136	3.0	<0.001	0.911	<0.001
Density (g/cm²)	0.243	0.289	0.298	0.323	0.322	0.276	0.0068	<0.001	0.562	<0.001
Dry defatted weight (g)	2.47	2.73	2.86	2.94	2.98	2.65	0.069	0.003	0.707	<0.001
Length (mm)	91.9	92.3	93.2	95.0	93.5	94.0	0.395	0.249	0.174	0.166

¹

Mean of 6 replicates (2 ducks per replicate) per treatment.