Table 2 Average concentrations of the hormones progesterone, estradiol, melatonin, and corticosterone in laying hens at 26, 30, and 34 weeks of age, subjected to spectra S1, S2, and C.

From: Impact of light spectrum electromagnetic radiation variations on performance and hormonal profiles in laying hens

Variables

Treatments

p-value

S1

S2

C

T

A

TxA

Progesterone (pg/mL)

9889.1 ± 999.5

8654.2 ± 791.2

8756.7 ± 717.3

0.3040

0.0000

0.2010

Estradiol (pg/mL)

11895.3 ± 1108.8

11836.6 ± 1183.4

10950.3 ± 1103.4

0.7603

0.1768

0.0197

Melatonin (pg/mL)

150.0 ± 25.6a

48.2 ± 13.8b

162.9 ± 31.4a

0.0135

0.2480

0.8994

Corticosterone (pg/mL)

4888.8 ± 778.5

4625.2 ± 1660.9

4288.7 ± 713.8

0.40931

0.17341

0.62411

  1. Means ± SE followed by different letters differ from each other according to the Tukey’s test at 5% probability.
  2. 1p-value from the non-parametric Scheirer–Ray–Hare test at 5% probability.
  3. S1: spectrum developed with color temperature of 4082 K.
  4. S2: spectrum developed with color temperature of 2193 K.
  5. C: spectrum with color temperature 3000 K.
  6. T: Treatment. A: Age. TxA: interaction between the Treatment and Age factors.
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