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

From: Effects of age on immune function in broiler chickens

Immunity indicators Vertex coordinatesa R2 Regression equation
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
  1. aThe X and Y of the vertex coordinates are the age and extreme value respectively