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Table 4 Up-Down: immunity indicators that increase first and then decrease 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
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
  1. aThe X and Y of the vertex coordinates are the age and extreme value respectively