From: Exogenous estradiol improves shell strength in laying hens at the end of the laying period
 | Lohmann Selected Leghorn (LSL) | Lohmann Brown (LB) | ||||
---|---|---|---|---|---|---|
Placebo | Estradiol | P value | Placebo | Estradiol | P value | |
(n = 2) | (n = 2) | (n = 2) | (n = 2) | |||
Egg weight (g) | 65.9 ± 0.35 | 65.6 ± 0.46 | n.s | 67.0 ± 0.50 | 66.3 ± 0.37 | n.s |
Shell Deformation (μm) | 74 ± 0.9 | 73 ± 0.9 | n.s | 74 ± 1.2 | 69 ± 0.7 | 0.0002 |
Shell breaking strength (g) | 4077 ± 71 | 4026 ± 58 | n.s | 4263 ± 79 | 4388 ± 71 | n.s |
Shell weight (g)* | 5.94 ± 0.04 | 5.96 ± 0.04 | n.s | 6.09 ± 0.04 | 6.38 ± 0.04 | <0.0001 |
Shell thickness incl membrane (mm)* | 0.386 ± 0.002 | 0.390 ± 0.002 | 0.0749 | 0.400 ± 0.002 | 0.409 ± 0.002 | 0.0014 |
Shell thickness excl membrane (mm)* | 0.357 ± 0.002 | 0.362 ± 0.002 | 0.0373 | 0.372 ± 0.002 | 0.378 ± 0.002 | 0.0415 |