Table 4 Up-Down: immunity indicators that increase first and then decrease in broiler chickens from d 1 to 34

Mononuclear macrophage ratio

(33, 2.81)

0.416

Y = −0.002441X² + 0.160X + 0.189

Peripheral blood CD3+CD4+ Th cell ratio

(24, 8.21)

0.355

Y = −0.011219X² + 0.533X + 1.875

Peripheral blood CD3+ T cell proliferation activity

(34, 0.92)

0.681

Y = −0.000221X² + 0.015X + 0.667

Peripheral blood B cell proliferation activity

(32, 0.86)

0.509

Y = −0.000224X² + 0.014X + 0.638

Ileum Mucin 2

(19, 2.65)

0.462

Y = −0.004697X² + 0.183X + 0.869

Ileum CD4

(37, 4.11)

0.506

Y = −0.002543X² + 0.188X + 0.640

Ileum TGF-β1

(31, 1.61)

0.305

Y = −0.000768X² + 0.047X + 0.895

Ileum IgA

(32, 3438.36)

0.434

Y = −4.323X² + 280.428X–1109.398