Table 2. Effect of Spirulina platensis on the qualitative parameters of eggs collected in the first period

Parameter	Crude 2.5%	Crude 5%	Crude 7.5%	Enrich 2.5%	Enrich 5%	Enrich 7.5%	Control
Egg weight (g)	11.09±0.9^ab	11.13±0.48^ab	12.85±1.9^c	10.80±2.02^a	12.78±1.8^bc	11.42±1.7^abc	11.75±1.6 ^abc
Shell thickness (mm)	22.52±1.6^a	23.25±1.4^a	23.52±1.4^a	23.02±1.7^a	23.00±1.5^a	22.58±0.7^a	22.55±1.5^a
Shell strength (kg/cm²)	1.10±0.15^a	1.24±0.34^a	1.37±0.22^a	1.09±0.4^a	1.12±0.41^a	1.19±0.14^a	1.12±0.39^a
Shape index (mm)	78.32±2.18^a	77.95±1.74^a	82.15±2.74^b	80.30±2.5^ab	78.65±2.11^a	80.29±0.96^ab	79.52±2.5^a
Egg volume (cm³)	10.61±0.98^a	11.12±0.6^a	14.47±1.4^c	10.96±1.2^a	13.13±0.88^b	11.19±0.5^a	12.74±1.05^b
Eggshell surface (cm²)	23.76±1.3^ab	23.82±0.69^ab	26.15±2.7^b	23.27±2.9^a	26.06±2.5^b	24.18±2.4^ab	24.66±2.2^ab
Albumen index	0.1206±0.01^a	0.1249±0.003 ^a	0.1186±0.01^a	0.1267±0.01^a	0.1203±0.01^a	0.1413±0.02^b	0.1184±0.01^a
Hough unit	91.65±2.89^a	89.11±2.89^a	89.33±2.89^a	91.84±2.8^a	90.62±2.81^a	91.55±3.82^a	89.46±2.89^a
Internal quality unit	65.36±5.8^b	60.73±1.86^ab	58.35±7.01^a	65.95±6.6^b	61.18±5.89^ab	64.62±7.75^ab	59.80±6^ab
Yolk index	0.4644±0.02^abc	0.4798±0.009^bc	0.4590±0.01^ab	0.4877±0.03^c	0.4669±0.02^abc	0.4441±0.01^a	0.4421±0.03^a

The same name letters above the numbers of each sample indicate no significant differences between the samples and the inconsistent letters indicate the significance of the samples with each other (p<0.05).