Long-term effects of early antibiotic intervention on blood parameters, apparent nutrient digestibility, and fecal microbial fermentation profile in pigs with different dietary protein levels

Table 3 Effects of early antibiotic intervention on growth performance of pigs with different protein level diets¹

Item	Low-CP		Normal- CP		SEM	P-value²
Item	Con	Ant	Con	Ant	SEM	Ant	CP	Ant × CP
42 d BW, kg	12.23	12.20	12.28	12.25	0.07	0.851	0.743	0.981
ADG, kg/d
d 42 to 77	0.50	0.52	0.51	0.51	0.02	0.686	0.972	0.786
d 77 to 185	0.78^b	0.81^ab	0.84^a	0.83^a	0.01	0.361	0.002	0.048
d 42 to 185	0.71^b	0.74^a	0.76^a	0.75^a	0.01	0.180	0.001	0.019
ADFI, kg/d
d 42 to 77	0.72	0.72	0.78	0.78	0.02	0.945	0.140	0.993
d 77 to 185	2.24	2.36	2.44	2.54	0.06	0.349	0.119	0.891
d 42 to 185	1.85	1.94	2.02	2.09	0.05	0.368	0.089	0.895
G:F
d 42 to 77	0.70	0.73	0.67	0.66	0.02	0.880	0.227	0.675
d 77 to 185	0.36	0.35	0.36	0.33	0.01	0.323	0.787	0.655
d 42 to 185	0.44	0.44	0.44	0.42	0.01	0.555	0.414	0.605

^{a, b}Means in the same row with different superscripts differ (P < 0.05)
¹The commercial creep feed with or without in-feed antibiotics (50 mg/kg olaquindox, 50 mg/kg oxytetracycline calcium, and 50 mg/kg kitasamycin) was fed to pig from d 7 to d 42. Thereafter, the Con and Ant group were further randomly assigned to provide a normal (20%, 18%, 14% CP from d 42 to d 77, d 77 to d 120, d 120 to d 185, respectively) or low CP diet (16%, 14%, 10% CP from d 42 to d 77, d 77 to d 120, d 120 to d 185, respectively), respectively
²The P values indicate main effects for antibiotic (Ant), protein level (CP) and their interaction (Ant x CP), respectively

ISSN: 2049-1891