Table 3.

Effect of graded levels of guanidinoacetic acid (GAA) on performance of growing-finishing pigs (Exp. 1)

Item	GAA, mg/kg					SEM	P-value
	0	300	600	900	1,200		ANOVA	Linear	Quadratic
Initial BW, kg	33.58	33.57	33.63	33.63	33.72	0.05	0.24	0.91	0.78
day 35 BW, kg	59.07	58.78	58.87	58.87	60.22	0.68	0.55	0.42	0.76
day 70 BW, kg	87.53	88.07	86.70	87.47	89.75	1.13	0.42	0.38	0.55
day 98 BW, kg	107.57	110.02	107.73	107.03	110.07	1.69	0.58	0.53	0.19
Grower, days 1 to 35
ADG, g	729	733	721	721	757	19	0.65	0.38	0.55
ADFI, kg	1.91	1.83	1.86	1.82	1.90	0.03	0.26	0.05	0.80
G:F	0.38	0.40	0.39	0.40	0.41	0.01	0.45	0.66	0.35
Finisher I, days 36 to 70
ADG, g	813	850	796	817	868	24	0.24	0.40	0.27
ADFI, kg	2.55	2.38	2.43	2.47	2.50	0.07	0.52	0.30	0.22
G:F	0.32b	0.36a	0.33ab	0.33ab	0.34ab	0.01	0.04	0.36	0.02
Finisher II, days 71 to 98
ADG, g	715	817	772	752	769	34	0.37	0.48	0.08
ADFI, kg	2.59	2.72	2.70	2.48	2.50	0.13	0.58	0.93	0.30
G:F	0.28	0.30	0.29	0.31	0.31	0.01	0.32	0.25	0.58
Overall, days 1 to 98
ADG, g	752	800	763	763	798	16	0.14	0.30	0.85
ADFI, kg	2.35	2.31	2.33	2.25	2.30	0.08	0.84	0.42	0.74
G:F	0.33b	0.35a	0.34ab	0.35a	0.35a	0.01	0.05	0.04	0.71

Data are the means of 6 replicates per treatment with 6 pigs per pen.

^a–cMeans with different superscripts within a row differ (P ≤ 0.05).