The objective of this study was to evaluate the effect of particle size of a dietary Ca source on egg production and eggshell quality when added to hens’ diets that have different levels of calcium. The experiment was carried out on 216 ISA Brown hens (25 to 70 weeks of age), allocated to 9 groups of 12 replicates (cages), with two birds in each cage. A 3 × 3 factorial arrangement was used, wit...

This experiment was conducted to evaluate the effect of vitamin C (L-ascorbic acid) and chromium (chromium picolinate, Cr Pic) on egg production, some egg characteristics, and digestibility of nutrients in laying hens (Hy-Line) reared under a low ambient temperature (6.2°C). Two hundred and ten laying hens (32 week-old) were divided into seven groups, 30 hens per group. The treatment groups wer...

in this study, the effects of culban seed (vicia peregrine l.) on live body weight, feed intake, feed efficiency, egg production, egg quality characteristics, egg yolk fatty acid profiles and yolk cholesterol content in laying hens were investigated. the experiment consists of seven treatment groups with ten replications containing one laying hen in each and for 32 weeks old seventy laying hen ...

This study investigated the effects of bamboo vinegar (BV) on production performance, egg quality, antioxidant status, and serum biochemical parameters laying hens during summer. One hundred twenty 36-week-old Hy-Line Brown were randomly assigned to 4 groups, with 30 per group. The control group was fed a basal diet 1 mL/kg, 5 10 mL/kg BV added 0.1% BV, 0.5% 1.0% respectively. experiment lasted...

Summary The production system is one of the most significant factors influencing internal and external egg quality. Due to concerns for welfare laying hens, on basis Council Directive 1999/74/EC, EU countries banned conventional cages, so it necessary determine influence alternative systems quality traits table eggs. Consumers believe that organic eggs are healthier than from systems. In additi...

a 70-days experiment was conducted to investigate the effects of natural zeolite (clinoptelolite) on the performance of commercial laying hens. 288 hy-line w36 strain laying hens (50 weeks old) were allotted to 6 dietary treatments including basal diet as control and basal diet supplemented with 1, 2, 3, 4 and 5% zeolite that were fed ad -libitum throughout the experiment. experimental diets fo...

Ammonia (NH3) emissions from laying hens are affected by nutrient content of the diet, manure quantity, and manure properties such as moisture content, nitrogen content, and pH. These production traits may vary with strain of the hen. However, limited information is available concerning the effects of laying-hen genetics on manure properties and NH3 emission. This study was conducted to compara...

increase in feed intake of broiler breeder hens, results to incidence of metabolic and hormonal changes and finally leads to poor reproductive performance. an experiment was conducted to evaluate responses of feed-satiated and feed-restricted laying breeder hens to daily injection of an acute dose of progesterone (p4). a total of 64 cobb 500 hens were fed either restricted or ad libitum from 27...

this experiment was designed to evaluate the effects of different levels of tomato pomace (dtp) with different multi enzymes on the performance and egg quality of laying hens at the first phase of production. in this experiment 432 hens were used in a completely randomized design in a factorial arrangement of 4×4, with four levels of tomato pomace (0, 4, 8 and 12) and different enzymes (without...

the study was conducted to evaluate the effects of different dietary oil sources supplementation on laying hens’ performance and fatty acids profile of egg yolks. seventy-two 23-week-old laying hens (tetra-sl) divided into six experimental diets (four replicates and three birds per replication) in a completely randomized design for nine weeks. experimental diets were included: 1) control (no oi...