Table 3.

Effect of guanidinoacetic acid (GAA) supplementation on growth performance of pigs from wean to finish (Exp 1)¹

	Dietary treatment				P value5
Item	CON1	0.08% GAA2	0.12% GAA3	SEM 4	Linear	Quadratic
Pre-starter
BW at 60 d, kg	17.78b	18.10ab	18.28a	0.10	0.002	0.650
ADG, g	354b	364ab	370a	3.29	0.002	0.617
ADFI, g	590	597	599	3.62	0.091	0.497
G:F	0.60	0.61	0.62	0.01	0.042	0.980
Starter
BW at 90 d, kg	31.61b	32.43b	33.66a	0.28	<0.001	0.501
ADG, g	461b	478b	513a	7.75	<0.001	0.338
ADFI, g	941	950	952	11.69	0.532	0.771
G:F	0.489b	0.503b	0.538a	0.004	<0.001	0.046
Grower
BW at 120 d, kg	52.31c	53.41b	55.40a	0.29	<0.001	0.245
ADG, g	690b	699ab	725a	7.77	0.004	0.404
ADFI, g	2012	2023	2002	21.84	0.761	0.546
G:F	0.344b	0.344b	0.361a	0.003	<0.001	0.005
Finisher
BW at 180 d, kg	95.3c	97.19b	101.0a	0.35	<0.001	0.047
ADG, g	717c	730b	759a	3.70	<0.001	0.093
ADFI, g	2376	2390	2378	7.18	0.866	0.161
G:F	0.300b	0.305b	0.319a	0.002	<0.001	0.085
Overall (30 to 180 d)
ADG, g	588c	600b	625a	2.31	<0.001	0.037
ADFI, g	1659	1670	1662	5.29	0.731	0.147
G:F	0.353c	0.361b	0.374a	0.001	<0.001	0.160

^a,b,cWithin a row, means without a common superscript differ (P < 0.05).

¹CON- control (basal) diet.

²0.08% GAA= basal diet + 0.8 kg GAA/MT.

³0.12% GAA= basal diet + 1.2 kg GAA /MT.

⁴SEM = standard error of mean.

⁵Considered significant when P < 0.05. Orthogonal polynomial contrasts were used to determine linear and quadratic effects of increasing levels of GAA (0%, 0.08%, and 0.12%) in the pig diets.