Table 7. The heterophil to lymphocyte (H:L) ratio and superoxide dismutase (SOD) enzyme activity in serum of male broilers on d 35 fed riboflavin and Bacillus subtilis and challenged with coccidiosis

Riboflavin	Bacillus	Coccidiosis	H:L	SOD U/mL
0.75			0.979	18.1
6.6			0.884	18.7
20			0.843	18.7
SEM¹⁾			0.0544	1.37
	No		0.936	17.8
	Yes		0.868	19.2
	SEM		0.0446	1.12
	Non-challenge		0.876	17.8
	Challenge		0.928	19.2
	SEM		0.0447	1.12
Riboflavin × Coccidiosis
0.75		Non-challenge	0.981	17.9^ab
0.75		Challenge	0.976	18.3^ab
6.6		Non-challenge	0.811	22.7^a
6.6		Challenge	0.958	14.7^b
20		Non-challenge	0.836	18.1^ab
20		Challenge	0.851	19.2^ab
SEM¹⁾			0.0769	1.94
p-value
Riboflavin			0.199	0.946
Bacillus			0.278	0.382
Coccidiosis			0.407	0.168
Riboflavin × Bacillus			0.057	0.971
Riboflavin × Coccidiosis²⁾			0.557	0.038
Bacillus × Coccidiosis²⁾			0.311	0.389
Riboflavin × Bacillus × Coccidiosis²⁾			0.448	0.441

n = 8.
Means of non-significant interactions are not listed.
Means in a column not sharing a common superscript are different (p < 0.05).