Table 1.

Effect of dietary zinc (Zn) concentration (ppm) and challenge (C) on average daily feed intake, average daily gain, and average daily zinc intake (n = 12)¹

Zinc, ppm	Control			Challenge			SEM	P-values
	150	1,400	2,500	150	1,400	2,500		Zn	C	Zn × C
Average daily feed intake, g/d
Day 0 to 3	127	93	67	90	85	121	25.3	0.62	0.85	0.06
Day 3 to 52	218	270	243	158	226	194	31.0	0.08	0.03	0.95
Day 5 to 72	285b	327a	307ab	210b	347a	301ab	33.0	0.01	0.38	0.20
Day 0 to 7	198	211	186	144	200	193	26.4	0.29	0.28	0.31
Day 7 to 14	529	586	444	416	561	525	101.1	0.14	0.67	0.19
Day 0 to 14	363	398	314	280	380	358	57.0	0.12	0.49	0.17
Average daily gain, g/d
Day 0 to 3	64	5	−31	−12	−19	16	49.9	0.65	0.59	0.32
Day 3 to 52	204b	310a	396a	54b	243a	171a	58.5	<0.01	<0.01	0.15
Day 5 to 73	312	314	259	169b	380a	368ab	35.5	0.09	0.94	0.06
Day 0 to 7	172	177	155	56	179	137	39.5	0.09	0.08	0.15
Day 7 to 14	355	414	428	372	385	451	60.3	0.73	0.56	0.41
Day 0 to 14	266	307	271	244	279	296	35.5	0.41	0.73	0.58
Average daily zinc intake, mg/d
Day 0 to 3	20b	127a,b	169ax	14b	117b	310a,y	43.0	<0.01	0.20	0.07
Day 3 to 5	33c	377b	625a	21c	315b	497a	55.9	<0.01	0.11	0.49
Day 5 to 7	43c	459b	795a	28c	488b	779a	58.9	<0.01	0.98	0.88
Day 0 to 7	30c	294b	479a	20c	280b	498a	47.0	<0.01	0.96	0.90
Day 7 to 14	75c	831b	1,152a	59c	790b	1,187a	98.6	<0.01	0.86	0.87
Day 0 to 14	54c	565b	816a	41c	536b	818a	59.4	<0.01	0.70	0.94

¹Reported estimate derived from the interaction model Zn × Challenge and the covariate of BW on d 0 and sex.

²Comparisons derived from the additive model.

³Comparisons derived from the interaction model.

^a,b,cIndicate difference (P ≤ 0.05) between dietary Zn concentrations within challenge group.Indicate difference (P ≤ 0.05) between dietary Zn concentrations within challenge group.

Values are least-square means with the standard error of mean (SEM).