• Kocevski, D.
• Kuzelov, Aco
• Nikolova, N.

Abstract

<jats:p>The experiment was conducted to evaluate the influence of strain and age onsome egg quality parameters (egg weight and egg shell strength) of commerciallaying hens. Layers of lines ISA Brown and DeKalb White were examined inperiod of nine months. Both lines were at same age (28 weeks) and wereconfined in common facility in battery cages. Laying hens were reared and fedaccording to standard breeding technology. Once a month 25 eggs of each linewere taken to be examined for eggshell strength and egg weight, or in otherwords, total 450 table eggs were tested. Analises were done in Laboratory fortesting egg quality by gaudges Egg Multi Tester EMT 5200 and Egg shell Gauge(Robotmation Co. Ltd., Tokyo, Japan) which have computerised equipment toexamine quality and physical characteristics of eggs. Statistic analyses onresults were done by computer sub-programme ANOVA and Fisher's LSD test todetermine the level of statistical significant difference between examinedfactors. Egg weight was under significant impact of age (P ? 0,05), but notunder the influence of strain, although eggs of ISA Brown line wereinsignificantly heavier than eggs of DeKalb White line. Eggs were heaviest atlayers with older age, while they were lightest at younger birds. The resultshave shown significant differences (P ? 0,05) in eggshell strength comparedto line influence (genotype) and months of age. Eggs from ISA Brown layinghens had much better and eggshell strength than those eggs from DeKalb White.Correlations between eggshell strength and egg weight were with significant(R &lt; 0,05) negative value, which indicating that with increasing egg weightdecreases of eggshell strength.</jats:p>

Topics

• experiment
• strength