Table 4. Effects of Kluyveromyces marxianus on the relative weight¹ of immune organs and serum parameters of broilers (21 d of age).

Dose (g/kg)	Spleen	Bursa	Thymus	IgG mg/mL	IgA mg/mL	IgM mg/mL	Lysozyme U/mL
0	0.92	2.12	2.68	1.65	0.38	0.30	171.24
0.25	0.83	2.15	2.68	1.85	0.44	0.33	194.57
0.50	0.80	2.04	2.76	2.53	0.33	0.36	185.62
1.0	0.86	1.99	2.90	3.14	0.40	0.34	204.97
1.5	0.82	1.94	2.88	2.46	0.41	0.23	204.57
2.0	0.79	1.96	2.98	2.31	0.39	0.24	202.51
2.5	0.87	2.22	3.42	2.89	0.45	0.27	185.90
SEM	0.022	0.059	0.069	0.144	0.024	0.019	3.632
P-value
Linear	0.602	0.923	0.001	0.044	0.507	0.103	0.228
Quadratic	0.483	0.344	0.003	0.040	0.705	0.334	0.016

n = 8 replicates per group.

¹ Relative weight of immune organs was expressed as the ratio of organ weight (g) to body weight (kg).