The influence of strain and age on some egg quality parameters of commercial laying hens

Abstract

The experiment was conducted to evaluate the influence of strain and age on some egg quality parameters (egg weight and egg shell strength) of commercial laying hens. Layers of lines ISA Brown and DeKalb White were examined in period of nine months. Both lines were at same age (28 weeks) and were confined in common facility in battery cages. Laying hens were reared and fed according to standard breeding technology. Once a month 25 eggs of each line were taken to be examined for eggshell strength and egg weight, or in other words, total 450 table eggs were tested. Analises were done in Laboratory for testing egg quality by gaudges Egg Multi Tester EMT 5200 and Egg shell Gauge (Robotmation Co. Ltd., Tokyo, Japan) which have computerised equipment to examine quality and physical characteristics of eggs. Statistic analyses on results were done by computer sub-programme ANOVA and Fisher's LSD test to determine the level of statistical significant difference between examined factors. Egg weight was under significant impact of age (P ? 0,05), but not under the influence of strain, although eggs of ISA Brown line were insignificantly heavier than eggs of DeKalb White line. Eggs were heaviest at layers with older age, while they were lightest at younger birds. The results have shown significant differences (P ? 0,05) in eggshell strength compared to line influence (genotype) and months of age. Eggs from ISA Brown laying hens had much better and eggshell strength than those eggs from DeKalb White. Correlations between eggshell strength and egg weight were with significant (R < 0,05) negative value, which indicating that with increasing egg weight decreases of eggshell strength.

Effect of breed on some parameters of egg quality in laying hens

“…Egg quality characteristics of chickens have been investigated in several studies (Scott and Silversides, 2000;Scott and Silversides, 2001;Roberts 2001;Monira et al, 2003;Anderson et al, 2004;Roberts, 2010;Kocevski et al, 2011;Cath et al, 2012). The results of exterior egg quality characteristics of two different breeds of Oravka and Rhode Island Red laying hens are given in Table 2. Egg weight is among the most important parameters not only for consumers, but for egg producers as well (Genchev, 2012).…”

Comparative analysis of the external and internal egg quality in different pure chicken breeds

“…Egg quality is factor which contributes for better economy price of fertile and table eggs (Kocevski et al, 2011). The egg quality parameters are under the influence of a number of factors and major one of which is the breed or variety of the observed chicken.…”

The Differences in Egg Quality of White Leghorn and Naked Neck Chicken

“…The quality characteristics of chicken eggs have been investigated in several studies (Roberts 2010;Kocevski et al 2011;Catli et al 2012;Hanusová et al 2015). The results of the quality characteristics of eggs from White Leghorn and Naked Neck chicken were presented in Table 1.…”