Table 4.

Effect of guanidinoacetic acid (GAA) level and sampling day days on growth performance and blood parameters (Exp. 1)

Item	P- value
	GAA level	Sampling day	GAA level* Sampling day
Growth performance
BW	0.7790	<0.0001	0.9997
ADG	0.1392	<0.0001	0.7630
ADFI	0.8446	<0.0001	0.7315
G:F	0.0492	<0.0001	0.9856
Blood parameters
GAA	0.0078	<0.0001	0.4876
creatine	0.0254	<0.0001	0.7248
creatinine	0.7610	0.6676	0.9447
ATP	0.0106	0.9684	0.4463
CK1	0.0823	0.2604	0.9148

¹CK = creatine kinase.