Table 1 Effect of the post-ovulation stage and the age on plasma levels of vitamin D metabolites and iP and the mRNA expression of genes in the parathyroid gland (PG).

From: Increased expression of fibroblast growth factor 23 is the signature of a deteriorated Ca/P balance in ageing laying hens

 

Plasma levels

mRNA expression (AU)

25(OH)D3 (ng/ml)

1.25(OH)2D3 (pg/ml)

Ca (mg/l)

iP (mg/l)

PTH

CaSR

P values

PO stage

0–1

42.9 ± 4.8

275b ± 22.6

229 ± 10

108.8b ± 4.87

1.43b ± 0.33

1.32 ± 0.18

9–10

46.1 ± 5.1

343.3a,b ± 23.9

240 ± 11

123.6b ± 5.28

1.67b ± 0.31

1.81 ± 0.17

18–19

49.4 ± 5.0

375.3a ± 23.6

234 ± 11

147.1a ± 5.10

2.71a ± 0.30

1.45 ± 0.16

Age

23

42.3 ± 3.8

388.1a ± 18.0

229 ± 8

123.8 ± 3.88

2.13 ± 0.23

1.46 ± 0.13

90

50.0 ± 4.3

274.3b ± 20.3

239 ± 9

129.3 ± 4.41

1.75 ± 0.28

1.59 ± 0.15

PO stage

0.356

0.006

0.728

 < .0001

0.008

0.584

Age

0.200

0.000

0.457

0.481

0.314

0.507

  1. Values are presented as LSMeans ± SEM with n = 11–12 per post-ovulation stage and n = 17–19 per age. For PTH and CaSR, n = 8–10 per post-ovulation stage and n = 11–16 per age. PO stage = post-ovulation stage (hour).
  2. a,bMeans with different superscripts for each effect tested in each model are significantly different (P < 0.05).
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