Table 5.

Effect of added Cu and diet type on DM and GE digestibility and serum glucagon-like peptide (GLP) concentration of finishing pigs¹

Added Cu,2 mg/kg:	0		150		SEM	Probability, P <
Diet type:	Corn-soy	By-product3	Corn-soy	By-product3		Cu × diet type	Cu	Diet type
Apparent total tract digestibility, %
Early finishing4
DM	94.31	92.09	95.02	91.45	0.306	0.029	0.906	0.001
GE	81.67	75.96	83.57	71.16	1.110	0.005	0.187	0.001
Late finishing5
DM	95.72	93.14	96.47	93.46	0.280	0.435	0.060	0.001
GE	85.97	77.88	88.11	80.32	0.676	0.832	0.003	0.001
Serum GLP concentration6
GLP-1, pM	12.97	14.07	14.54	12.24	2.659	0.530	0.960	0.825
GLP-2, ng/mL	1.92	1.67	1.78	1.68	0.354	0.831	0.854	0.616

¹A total of 757 pigs (PIC 337 × 1050; initially 27.6 kg BW) were used in a 117-d growth study with 26 to 28 pigs per pen and 7 replications per treatment.

²Tri-basic copper chloride (Intellibond C; Micronutrients, Inc., Indianapolis, IN).

³Refers to a diet containing 30% distillers dried grains with solubles (DDGS) and 15% bakery meal.

⁴Fecal samples collected over a 2-d period during phase 2 from day 25 to 26.

⁵Fecal samples collected over a 2-d period during phase 4 from day 74 to 75.

⁶Samples collected from 2 pigs per pen (totally 84 pigs).