Table 9.

Mineral composition and breaking strength of laying hens tibia. Data are presented as means (SD)^c

NPP,%	LPS	Tibia breaking strength, kg/cm2	Tibia calciumb, %	Tibia phosphorusb,%	Tibia asha,%
0.12	–	171.8	33.45	10.48e	54.14
	+	195.8	31.46	13.45d	54.26
0.40	–	178.7	35.10	15.26d	52.79
	+	191.2	36.21	13.93d	55.01
SEM		7.24	0.78	0.52	0.52
Main effect means
NPP
0.12		183.8	32.45e	11.96e	54.20
0.40		184.9	35.65d	14.59d	54.02
LPS
–		175.2	34.27	12.87	53.54
+		193.5	33.84	13.69	54.64
P-value
NPP		0.938	0.041	0.003	0.784
LPS		0.238	0.766	0.282	0.288
NPP × LPS		0.704	0.287	0.010	0.338

^aResults were expressed on dry-defatted weight basis of tibia

^bResults were expressed on ash weight basis of tibia

^cMeans were calculated on n = 5 replicates (one laying hens per replicate) per treatment

^d,eWithin comparisons, means in a column with no common superscripts differ significantly (P < 0.05)