Growth performance, nutrient digestibility, intestinal morphology, cecal mucosal cytokines and serum antioxidant responses of broiler chickens to dietary enzymatically treated yeast and coccidia challenge

Table 4 Main effects of ETY and coccidia challenge on the growth performance and nutrient digestibility of broiler chickens, d 14 to 21 post hatching

Item	Concentrations of ETY, g/kg			CS		SD^b	P-value
	Concentrations of ETY, g/kg			CS			Challenge	ETY		Challenge × ETY interaction
	0	1	2	No-challenge	Challenge		Challenge	L	Q	Challenge × ETY interaction
Growth performance^a
BW, g
d 14	392.8	385.6	398.6	392.0	392.6	62.99	–	–	–	–
d 21	732.0	727.2	736.5	799.2	664.6	29.34	< 0.001	0.665	0.436	0.674
BW gain, g/bird	339.7	334.9	344.2	406.9	272.3	29.34	< 0.001	0.665	0.436	0.674
Feed intake, g/bird	524.7	467.4	482.5	523.3	459.8	69.27	0.012	0.095	0.099	0.549
G:F, g/kg	659.3	708.2	707.7	781.9	601.5	66.61	< 0.001	0.025	0.178	0.946
No. of replicates	16	16	16	24	24
Nutrient digestibility
AID of DM, %	55.6	58.0	61.3	65.6	50.9	4.99	< 0.001	0.003	0.694	0.572
AID of GE, %	55.2	57.8	62.2	68.1	48.6	5.52	< 0.001	0.001	0.428	0.346
AID of N, %	65.6	67.1	70.0	77.3	57.8	4.71	< 0.001	0.003	0.444	0.224
IDE, kcal/kg DM	2220.0	2323.0	2506.3	2742.2	1957.3	222.03	< 0.001	0.001	0.399	0.348
TTR of DM, %	63.0	62.3	63.1	73.8	51.8	2.44	< 0.001	0.943	0.271	0.693
TTR of GE, %	63.1	62.5	63.4	76.8	49.2	2.33	< 0.001	0.648	0.272	0.885
TTR of N, %	55.7	54.4	55.1	67.0	43.2	3.31	< 0.001	0.550	0.354	0.501
AME, kcal/kg DM	2535.4	2512.8	2557.5	3089.6	1980.9	93.88	< 0.001	0.486	0.223	0.874
AMEn, kcal/kg DM	2387.3	2371.4	2419.8	2913.2	1872.5	86.44	< 0.001	0.279	0.214	0.878
No. of replicates	15	14	13	24	18

ETY Enzymatically treated yeast, CS Challenge state, L Linear effect of ETY, Q Quadratic effect of ETY, BW Body weight, G:F Gain to feed ratio, AID Apparent ileal digestibility, IDE Ileal digestible energy, TTR Total tract retention, DM Dry matter, GE Gross energy, N Nitrogen, AME Apparent metabolizable energy, AMEn Nitrogen corrected apparent metabolizable energy
^aAnalysis of covariance was used to adjust for the difference in BW on d 14
^bSD Standard deviation

ISSN: 2049-1891