Kirkuk University Journal for Agricultural Sciences (KUJAS)

Bio-Statistical Relations Among Phenotypic Egg Traits and Effects of Age on some external traits of eggs in Lohmann- Brown Classic Hens

https://doi.org/10.58928/ku17.08514
Volume 8, Issue 5
Autumn 2017
Page 177-187
Kirkuk University Journal for Agricultural Sciences (KUJAS)

Authors

Alaa Abdul Majeed
Bnar Fouad Suleiman
Kamaran Abduljalil Abas
Tahsin Saady Husain
Abstract
It's difficult to determine some egg quality traits in commercial poultry farms.Therefore, this study was conducted to find linear regression between external egg traits and effect of hen age on some external characteristics of eggs in Lohmann Brown- Classic hen. A total of 120 hens were housed in battery cages include four lines from 24 to 41 weeks of hen's age. In this experiment we measure external physical characteristics (egg weight (g), egg shape index, egg strength (kg/cm2), specific gravity, shell thickness (mm), egg surface area and unite of surface shell weight (mg/cm2) were study. Results showed that relations between egg shape index with egg width positive, but negative with egg weight and length (p<0.05). Otherwise, the phenotypic relations values of egg weight and egg shell traits showed highly significant (P<0.01) positive with egg weight specific gravity, shell percentage, shell thickness and shell strength. All external egg quality characteristics increased with the increase of hen's age. Egg shape index, Surface area, and specific gravity, shell thickness and unit surface area were increased significantly (p<0.05) with the increase of hens age. While percentage of egg shell decreased for older hen age. The egg strength ranged between 1.00 –1.20 (kg/ cm2) during the experiment period.

Keywords

Lohmann
brown classic
external egg characteristics
Regression equation
Age

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