The main aim of this research was to estimate the genetic and phenotypic parameters for productive and reproductive traits of Esfahan native chickens. Traits included body weights at hatch (BW1), 8 weeks of age (BW8), 12 weeks of age (BW12), and at sexual maturity (WSM)], age at sex maturity (ASM), egg number (EN), average egg weight (AEW) in the first 12 weeks of production, and egg production...

The effects of a series of balanced dietary protein levels on egg production and egg quality parameters of laying hens from 18 through 74 wk of age were investigated. One hundred forty-four pullets (Bovans) were randomly assigned to individual cages with separate feeders including 3 different protein level series of isocaloric diets. Diets were separated into 4 phases of 18-22, 23-32, 33-44, an...

Currently, the egg industry is experiencing a shift in demand for eggs from cage-free environments. This study aims to evaluate quality parameters of white laid several different housing environments utilized industry. Egg battery cages, barren colony enriched cages and pens were compared. Overall, most found be across Battery produced heaviest with highest Haugh unit (p < 0.05). Cage-free h...

Mycoplasma synoviae (M. synoviae) can cause respiratory disease, synovitis, peritonitis, egg apical abnormalities or a subclinical infection. The importance of M. synoviae is well established in broilers but only a few studies have been conducted in layers. In the present study, the prevalence of M. synoviae in commercial layer flocks was determined by ELISA using egg yolk antibodies. Subsequen...

Three White Leghorn strains, their two-way crosses, and two commercial lines were used to study the effects of aging on several parameters related to performance of fitness and nonfitness traits during the first laying cycle of hens housed three per cage. Egg number of the survivors (EPF) and egg number including mortality and morbidity (EPM) were divided into 12 periods of 28 d each, starting ...

This experiment studied the effect of four calcium (3.0, 3.5, 4.0, and 4.5%) and four available phosphorus levels (0.25, 0.30, 0.35, and 0.40%) in the diet of semi-heavy commercial layers after molting. Hisex Brown layers between 90 and 108 weeks of age were distributed in a completely randomized experimental design with a 4x4 factorial arrangement with 16 treatments of five replicates of eight...

Even though the laying hen industry in Kuwait is one of the most important animal industries, it covers only 55% of local egg consumption, and the remainder is imported resulting in increase in egg prices. In addition, a major problem that the egg industry is facing is the low quality of the eggshells, resulting in a large loss to the industry. Therefore, it is important to use a strain of layi...

This study was aimed at determining the effect of irradiation of shell eggs on the physiochemical and functional properties of liquid egg white during storage. Color and textural parameters of irradiated liquid egg white after cooking were also determined. Shell eggs were irradiated at 0, 2.5, 5, or 10 kGy using a linear accelerator. Egg white was separated from yolk and stored in at 4°C up to ...