. 2023 Sep 21;102(12):103134. doi: 10.1016/j.psj.2023.103134

Table 3.

Weekly performance objectives in Ross 708 broilers fed diets containing egg yolks ± peptide-specific antiinterleukin-4 antibodies before and after Eimeria challenge¹.

	Treatment											P values
Measure	Control		Peptide 1		Peptide 2		Peptide 3		Peptide 4		SEM	Diet	Eimeria	Diet × Eimeria
D 0 BW², g	44.00		43.67		44.00		44.17		44.33		0.0006	0.85	N/A	N/A
Wk 1
D 7 BW, g	155.40		150.00		150.40		152.20		151.30		4.20	0.72	N/A	N/A
BWG, g	111.20		105.90		106.20		108.10		107.10		4.20	0.72	N/A	N/A
FI, g	133.50		126.90		129.90		129.40		129.30		3.60	0.48	N/A	N/A
FCR	1.20		1.20		1.22		1.20		1.21		0.04	0.97	N/A	N/A
Wk 2
D 14 BW, g	376.6		343.00		342.60		353.10		358.90		13.26	0.10	N/A	N/A
BWG, g	221.40		193.20		192.50		200.90		207.80		10.75	0.07	N/A	N/A
FI, g	285.10		263.30		266.40		276.50		269.80		11.53	0.36	N/A	N/A
FCR	1.29		1.36		1.40		1.39		1.30		0.05	0.09	N/A	N/A

	Treatment											P values
	Control	Control + Eimeria	P1	P1 + Eimeria	P2	P2 + Eimeria	P3	P3 + Eimeria	P4	P4 + Eimeria	SEM	Diet	Eimeria	Diet × Eimeria

Wk 3
D 21 BW, kg	0.77	0.69	0.74	0.59	0.64	0.60	0.73	0.65	0.80	0.59	0.05	0.06	<0.0001	0.18
BWG, kg	0.40	0.31	0.39	0.26	0.32	0.25	0.38	0.29	0.44	0.23	0.03	0.09	<0.0001	0.12
FI, kg	0.56	0.52	0.56	0.44	0.50	0.45	0.54	0.46	0.59	0.44	0.04	0.19	<0.0001	0.29
FCR	1.41	1.68	1.44	1.68	1.58	1.82	1.43	1.62	1.37	1.92	0.09	0.07	<0.0001	0.09
Wk 4
D 28 BW, kg	1.27	1.18	1.17	1.13	1.12	1.09	1.20	1.18	1.32	1.06	0.09	0.30	0.03	0.27
BWG, kg	0.49	0.49	0.43	0.54	0.46	0.49	0.47	0.53	0.52	0.48	0.05	0.92	0.15	0.23
FI, kg	0.76	0.75	0.70	0.74	0.67	0.73	0.72	0.79	0.79	0.70	0.06	0.60	0.57	0.34
FCR³	1.54^ab	1.54^ab	1.62^a	1.38^b	1.47^ab	1.49^ab	1.54^ab	1.49^ab	1.52^ab	1.47^ab	0.05	0.50	0.01	0.01
D 0–28
BWG, kg	1.22	1.14	1.13	1.09	1.07	1.05	1.15	1.13	1.28	1.02	0.09	0.30	0.03	0.27
FI, kg	1.74	1.69	1.66	1.55	1.57	1.58	1.66	1.67	1.80	1.53	0.11	0.37	0.08	0.36
FCR	1.42^ab	1.49^ab	1.48^ab	1.43^ab	1.47^ab	1.51^a	1.44^ab	1.47^ab	1.41^b	1.50^a	0.03	0.32	0.02	0.05

Birds were challenged with 10X Coccivac-B52 (Merck Animal Health, Kenilworth, NJ) or PBS on d 14. Data represent the average of 6 pens/diet (wk 1 and 2) or 3 pens/diet × Eimeria challenge group (wk 3, 4, and overall) on a per bird basis. Eimeria effects not included in the statistical model for wk 1 and 2 as birds were not challenged until d 14.

Abbreviations: BW, body weight; BWG, body weight gain; FI, feed intake; FCR, feed conversion ratio (intake/BWG).

Values with different letter superscripts are significantly different, P ≤ 0.05.