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 4 Effects of early antibiotic intervention on total tract apparent digestibility of pigs with different protein level diets^a

Item, %	Low-CP		Normal-CP		SEM	P-value²
Item, %	Con	Ant	Con	Ant	SEM	Ant	CP	Ant × CP
d 77
DM	75.24	76.73	74.81	80.52	0.98	0.065	0.368	0.263
CP	60.00	64.84	64.54	73.45	1.75	0.032	0.040	0.498
OM	79.86	79.65	78.31	83.32	0.88	0.173	0.538	0.140
Crude fat	44.61	48.44	53.96	56.88	1.34	0.136	<0.001	0.831
d 185
DM	77.12	72.61	79.24	71.82	1.67	0.103	0.843	0.666
CP	72.46	72.45	75.08	73.35	0.67	0.550	0.240	0.550
OM	82.93	81.67	82.14	80.54	0.51	0.198	0.372	0.867
Crude fat	50.52	48.48	57.72	56.74	1.34	0.320	<0.001	0.720

DM dry matter, CP crude protein, OM organic matter
^aThe 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