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Table 5 Up-Up: continuously rising immune indicators 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 NO, μmol/L (−12, 49.86) 0.555 Y = 0.012119X2 + 0.291X + 51.609
Serum C3, g/L (94, 0.36) 0.382 Y = −0.000016X2 + 0.003X + 0.216
Serum C4, g/L (42, 0.08) 0.462 Y = −0.000012X20.001X + 0.063
Serum IL-2, pg/mL (−10, 63.07) 0.917 Y = 0.018744X2 + 0.361X + 64.811
Serum IFN-γ/IL-4 (−1, 0.69) 0.435 Y = 0.000071X2 + 0.000135X + 0.687
Peripheral blood CD3+CD8+ Tc cell ratio (−60, −2.11) 0.252 Y = 0.000858X2 + 0.103X + 0.976
Serum IgG, g/L (−42, 5.00) 0.304 Y = 0.000403X2 + 0.034X + 5.718
Spleen index (758, 9.18) 0.801 Y = –0.000015X2 + 0.023X + 0.568
Spleen NF-κB (−53, 0.53) 0.545 Y = 0.000144X2 + 0.015X + 0.931
Ileum MHC-II (267, 70.85) 0.519 Y = −0.001X2 + 0.534X-0.439
Ileum CD3d (59, 14.11) 0.536 Y = −0.004X2 + 0.468X + 0.416
Ileum TCRβ subunit (72, 29.32) 0.641 Y = −0.006X2 + 0.861X−1.573
Ileum TCRζ subunit (68, 19.92) 0.534 Y = −0.004548X2 + 0.621X−1.277
Ileum IFN-γ (−43, −11.25) 0.64 Y = 0.005365X2 + 0.464X−1.212
Ileum pIgR (−85, −27.86) 0.773 Y = 0.003925X2 + 0.664X + 0.224
Ileal mucosa sIgA, ng/mg (56, 0.26) 0.374 Y = −0.000027X2 + 0.003X + 0.175
  1. aThe X and Y of the vertex coordinates are the age and extreme value respectively