Table 6.

Impact of diet energy and nutrient levels and super-dosed phytase on whole body grow-finish growth performance, experiment 2¹

	Treatment2						P value
Item	PC	NC	1,000 FTU phytase/kg	1,750 FTU phytase/kg	2,500 FTU phytase/kg	SEM	PC vs. NC3	NC vs. SD4
Initial BW, kg	36.77	36.56	36.57	36.51	36.50	0.412	0.160	0.722
Final BW, kg	125.26	120.12	121.86	121.39	122.04	0.746	<0.001	0.217
ADG, kg/d	1.011	0.960	0.974	0.961	0.972	0.007	<0.001	0.189
ADFI, kg/d	2.867	2.853	2.878	2.827	2.857	0.021	0.577	0.952
G:F5	0.353	0.336	0.339	0.340	0.340	0.002	<0.001	0.084
Energy efficiency, kg gain/Mcal ME or NE6
ME5	0.104	0.100	0.101	0.101	0.101	0.0005	<0.001	0.083
NE5	0.136	0.131	0.132	0.133	0.133	0.0006	<0.001	0.083

¹Data are least square means; n = 20 pens per treatment total with 19 to 24 pigs per pen, split by sex with 50 pens of gilts and 50 pens of barrows; 98-d trial.

²The NC was formulated to contain 12% less SID lysine with relative lowering of all other AA, plus 0.75 percentage points less added fat. Both PC and NC contained 250 FTU phytase/kg.

³Linear contrast of PC vs. NC.

⁴Comparison of NC vs. mean of three super-dosing treatments.

⁵Data not shown: sex × treatment, P < 0.001.

⁶Energy efficiency calculated as: ADG / (ME or NE of diet × ADFI).