Table 3 Down-Up: immunity indicators that decrease first and then increase in broiler chickens from d 1 to 34

Serum IL-1β, pg/mL

(8, 21.74)

0.862

Y = 0.040637X²–0.652X + 24.361

Serum IL-4, pg/mL

(11, 68.15)

0.539

Y = 0.024697X²–0.564X + 71.368

Serum IL-10, pg/mL

(8, 18.40)

0.809

Y = 0.029038X²–0.460X + 20.226

Serum IFN-γ, pg/mL

(9, 47.21)

0.917

Y = 0.024298X²–0.438X + 49.091

Serum IgA, g/L

(3, 0.71)

0.332

Y = 0.00022X²–0.001X + 0.716

Spleen IL-6

(15, 0.43)

0.452

Y = 0.002893X²–0.085X + 1.059

Ileum IL-2

(10, 0.97)

0.644

Y = 0.003977X²–0.077X + 1.347

Ileum IFN-γ/IL-4

(8, 0.34)

0.758

Y = 0.007573X²–0.126X + 0.861

Ileum Lysozyme C

(7, 0.52)

0.46

Y = 0.00181X²–0.024X + 0.598