Table 2.
Effect of γ-aminobutyric acid and the probiotic on egg quality in broiler breeder

Parameters	Treatments			SEM	P-value
	Control	GABA	Probiotics
Egg weight (g)	67.66	66.98	69.54	1.154	0.918
Ablumen height (mm)	5.07	5.18	5.03	0.265	0.759
Haugh units	65.36	67.14	64.34	2.686	0.949
Yolk color	7.39	7.38	7.28	0.266	0.949
Shell thickness (μm)	3.46	3.73	3.16	0.329	0.487
Shell strength (g/cm2)	378.00	379.00	377.00	10.121	0.990