Egg production rate is a positive economical factor in commercial laying hens. In egg industry, the only source of income is the number and weight of eggs laid in a laying cycle, therefore, researchers have been trying to find approaches to increase the egg number in each laying cycle. In general, a hen lays eggs in clutches with a pause of one or a few days in between the clutches (pause days)...

A trial was conducted to study the effect of two dietary electrolyte balances (dEB, dEB=Na+K-Cl, meq/100g) on the productive performance, quality of eggs and physiological status of Hy-Line Brown laying hens. 128 hens were allocated in cages (4 hens/cage) and divided into two experimental groups (16 repetitions/group). The diets were isoproteic and isocaloric with different electrolyte balance ...

The effects of feeding diets containing 15% Distillers Dried Grains with Solubles (DDGS) with or without phytase or vitamin D3 on egg production and some quality parameters were evaluated in laying hens. At 40 wks of age, 324 Lohmann Brown hens were randomly assigned to 6 treatments (two positive and two negative controls and two treatments) with 9 replicate groups of 6 hens each. The diets wer...

This study was conducted to determine the effects of red light exposure on the productivity, fertility and hatching characteristics in Thai native hens (Gallus domesticus). A total of 120 birds aged 18 wk were housed in an open-sided shed and exposed to one of the following lighting treatments: 1) natural daylight supplemented with fl uorescent light (Control), 2) natural daylight supplemented ...

This experiment was designed to evaluate the effects of the processing method of common vetch seed (CVS) (Vicia sativa) on laying performance, egg quality, metabolic parameters and liver histopatology during the peak production period in hens. Lohman layers, 46 wk of age in 6 replicate cages each containing 4 hens, were allocated randomly to one of four dietary treatments. Diets were control (C...

An arrest in egg laying associated with a polycystic ovarian follicle syndrome (PCOF) has been recently reported early in the egg production period in turkey hens photostimulated at 30 wk of age (WOA) with continuous light. When autopsied 2 to 3 wk after laying ceased, the ovaries of PCOF hens contained an increased number of mature size (F1) yolky follicles in comparison with normally laying h...

The effects of stocking density on the performance, egg quality, leukocyte concentration, blood biochemistry, corticosterone levels, bone mineral density, and noxious gas emission of laying hens were investigated. Eight hundred 34-week-old Hy-Line Brown laying hens (Gallus gallus domesticus) were randomly assigned to one of 4 treatments, each of which was replicated 4 times. Four stocking densi...

in the current iranian poultry industry, antibiotics are the most frequently used additive in feeds to increase the productivity. regarding the negative effects on human health due to consuming chicken whose feeds contain antibiotics, finding an appropriate alternative is of a great importance. this study aims to find an appropriate and harmless feed additive to increase the quality and quantit...

OBJECTIVE The aim of the study was to evaluate genetic correlations between the behavioural profile and performance in laying hens as an indirect answer to the question whether the observed behavioural responses are associated with increased levels of stress in these birds. METHODS The assessment of birds' temperament was carried out using the novel objects test. The behavioural test was cond...

this experiment was conducted to evaluate the effects of fennel and thymyus valgaris extracts with and without flaxseed on performance and egg quality of laying hens (hy line w-36). the experiment was conducted in a completely randomized design with 200 laying hens in 5 treatments and 5 replicates (with 8 hen in each replicate) for 12 weeks. the hens were fed isocaloric and iso nitrogenous diet...