Table 2.

The impact of adding different levels of Buttiauxella phytase to a negative control diet on performance of pigs during each feeding phase.

Item	PC1	NC1	NC + 500 FTU Phytase	NC + 1,000 FTU Phytase	SEM	P-value	P-value Linear2
Starter phase (12 to 25 kg)
BW at start, kg	11.9	11.9	11.9	11.9	0.24	1
ADG, kg	0.57a	0.43c	0.47b	0.54a	0.009	<0.0001	<0.0001
ADFI, kg	0.99a	0.85c	0.88bc	0.95ab	0.020	<0.0001	0.0007
G:F	0.574a	0.511b	0.533b	0.564a	0.0069	<0.0001	<0.0001
Mortality, %	0.35	0.00	0.69	1.39	0.54	0.33	0.1
Grower 1 phase (25 to 50 kg)
BW start, kg	27.3a	23.6b	24.6b	26.4a	0.44	<0.0001	<0.0001
ADG, kg	0.78b	0.62d	0.72c	0.83a	0.013	<0.0001	<0.0001
ADFI, kg	1.75a	1.44c	1.59b	1.78a	0.036	<0.0001	<0.0001
G:F	0.444bc	0.431c	0.453ab	0.467a	0.0045	<0.0001	<0.0001
Mortality, %	0.69	1.39	0.35	0.35	0.51	0.43	0.17
Grower 2 phase (50 to 75 kg)
BW start, kg	49.2a	41.1c	44.8b	49.7a	0.75	<0.0001	<0.0001
ADG, kg	0.90a	0.78b	0.88a	0.92a	0.016	<0.0001	<0.0001
ADFI, kg	2.34a	2.06b	2.23a	2.39a	0.044	<0.0001	<0.0001
G:F	0.383	0.375	0.395	0.385	0.006	0.25	0.37
Mortality, %	1.39	1.79	0.35	0.70	0.51	0.35	0.18
BW end of grower phase, kg	74.7b	66.9a	69.8a	75.8b	0.95	<0.0001	<0.0001
Finisher 1 phase (75 to 100 kg)
BW end of finisher 1, kg	98.4ab	87.2c	94.8b	100.0a	1.15	<0.0001	<0.0001
ADG, kg	0.80	0.78	0.83	0.84	0.020	0.18	0.046
ADFI, kg	2.69xy	2.57y	2.67xy	2.79x	0.057	0.085	0.01
G:F	0.298	0.305	0.310	0.301	0.006	0.50	0.7
Mortality, %	1.40	2.21	2.45	0.36	0.73	0.19	0.21
Whole finisher 75 kg to slaughter3
BW at slaughter, kg	130.5		130.9	132.7	1.236	0.44
ADG, kg	0.78b		0.83a	0.79ab	0.013	0.0297
ADFI, kg	2.97		2.95	3.03	0.053	0.58
G:F	0.264b		0.282a	0.262b	0.037	<0.0001

^{a, b, c} Values in the same row not sharing the same superscript differ at P < 0.05.

^{x, y} Values in the same row not sharing the same superscript tend to differ at P < 0.10.

¹Negative control (NC) diet was formulated without added inorganic phosphate, 0.15 MJ/kg less ME and 0.13% less Ca vs. the positive control (PC).

²Linear regression was analyzed with increasing phytase dose from 0 (NC) to 1,000 FTU/kg.

³Pigs fed the NC diet switched to the PC diet at the end of finisher 1 and not used in the calculation for PC group. Only 3 replicates in NC reached market weight and therefore NC treatment was not included for calculating overall performance for whole finisher phase.