Effect of dietary energy levels and phase feeding by protein levels on growth performance, blood profiles and carcass characteristics in growing-finishing pigs

Table 6 Effects of dietary energy and protein levels on nutrient digestibility and nitrogen retention in growing · finishing pigs¹

Criteria	Treatments³					SEM²	P-value
Criteria	ME 3,265	ME 3,365	CON	P4(P5)	LP5	SEM²	E	P	E×P
Nutrient digestibility, %
Dry matter	90.33	90.44	90.63	90.21	90.31	0.233	0.84	0.79	0.78
Crude protein	87.60	87.53	88.70	87.20	86.80	0.409	0.99	0.19	0.46
Crude ash	60.52	59.35	59.55	58.19	62.06	1.078	0.61	0.38	0.64
Crude fat	71.00^B	76.80^A	77.45	71.94	72.33	1.358	0.02	0.12	0.28
N-retention, g/d
N-intake	116.99	117.37	127.04	114.70	109.82	1.832
N-feces	14.43	14.53	14.35	14.69	14.40	0.460	0.93	0.96	0.48
N-urine	71.25	70.69	81.55^A	71.69^A	59.68^B	2.628	0.89	0.01	0.58
N-retention⁴	31.31	32.16	31.14	28.32	35.75	2.175	0.82	0.26	0.65
N-retention⁵, %	27.02	27.49	24.51^b	24.68^ab	32.57^a	1.747	0.88	0.08	0.67

¹A total of 24 barrow and initial body weight 49.37 ± 2.97 kg
²CON: CP 18.0 %, P4(P5): CP 16.3 %, LP5: CP 15.6 %
³Standard error of mean
⁴N retention = N intake (g) - Fecal N (g) - Urinary N (g)
⁵N retention (%) = N retention/N intake × 100
^AB means with different superscripts in the same row significantly differ (P < 0.05)
^abmeans with different superscripts in the same row significantly differ (0.05 ≤ P < 0.10)

ISSN: 2055-0391