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Table 1 Summary statistics of 640 nm absorbance spectrophotometry measurements for determining shell color and cuticle deposition for all breeds and ages

From: Genetic variation and potential for genetic improvement of cuticle deposition on chicken eggs

 

Age (weeks)

n

Mean

Standard deviation

Breed 1, RIR

31

   

Pre-stain Abs@640 nm

 

1262

0.178

0.044

Post-stain Abs@640 nm

 

1262

0.421

0.091

ΔAbs@640 nm

 

1262

0.243

0.071

Breed 1, RIR

50

   

Pre-stain Abs@640 nm

 

1262

0.208

0.039

Post-stain Abs@640 nm

 

1261

0.447

0.096

ΔAbs@640 nm

 

1261

0.239

0.080

Breed 2A, WL

32

   

Pre-stain Abs@640 nm

 

914

-0.053

0.011

Post-stain Abs@640 nm

 

915

0.211

0.116

ΔAbs@640 nm

 

914

0.264

0.112

Breed 2B, WL

29

   

Post-stain Abs@640 nm

 

994

0.511

0.109

Breed 3, broiler

39

   

Pre-stain Abs@640 nm

 

1448

0.039

0.028

Post-stain Abs@640 nm

 

1444

0.286

0.100

ΔAbs@640 nm

 

1444

0.247

0.094

Breed 4, WR

62

   

Pre-stain Abs@640 nm

 

1373

0.359

0.045

Post-stain Abs@640 nm

 

1368

0.647

0.072

ΔAbs@640 nm

 

1368

0.288

0.063

  1. Note that comparison of mean values between breeds or ages is not valid because the measurements were made at different times and ages, and with different instruments and stain batches
  2. The breeds are Rhode Island Red (breed 1, RIR), two groups of White Leghorn (WL, breeds 2A and 2B), White Rock (breed 4, WR) and a broiler (breed 3). Absorbance (\(A\)) is a unit-less measurement and was calculated according to the formula \(A = - \log_{10} R\) where \(R\) is the fraction of light reflected. Differences in ‘\({\text{n}}\)’ are due to broken or missing eggs for some hens