عنوان مقاله [English]
To evaluate the effect of some managerial parameters on the performance 150 poultry laying flocks (room) from 15 commercial laying farms in Alborz and Tehran provinces of Iran were studied in this experiment. The educational information’s of the managers, geographic location and condition of flock health, nutrition and lighting program were collected thorough questionnaire distribution among the technical managers of commercial egg laying farms. Another required information such as light color, diet properties, feed intake, egg production were collected with direct observation and referring to the preexisting data which registered in the farms notebooks. For evaluation of egg quality, 10 eggs from each flock randomly selected and maintained under standard condition until laboratory assessments, then in the laboratory the egg quality parameters such as egg weight, egg edible percentage, egg yolk color, egg shell thickness, dry egg shell weight, yolk weight, and egg shape index were evaluated. Data from this study were analyzed using the GLM procedure of SPSS20 statistical software with t-student test (for 2 data groups) and F test (for more than two data groups).The results showed that the relevance of the managers profession with their education resulted to some decreases in yolk color, yolk weight and feed consumption and an increase in mortality (P <0.05). Farm manager training reduced yolk color, egg shell thickness, yolk weight, haugh unit, egg shape index, feed intake and mortality is increased (P <0.05). Percentage of yolk and feed to egg conversion were higher yolk color and egg production were lower in Varaminian flocks rather than Karaj flocks (P <0.05).Using of pelleted rather than mash feed resulted in some increases in yolk color, egg shell thickness, egg shape index, feed intake, feed to egg conversion and resulted in decrease of mortality (P <0.05). Haugh unit, feed intake, egg production and daily egg production per hen were reduced when ration prepared outside of farms rather than inside of them (P <0.05). Previous Conflict of flocks with disease rather than no previous conflicted flocks resulted in increase of egg shell thickness, egg shape index, and feed intake, feed to egg conversion, and decrease in egg weight, daily egg production and mortality. The use of CFLs compared to incandescent lamps increased egg weight, yolk color, egg contents weight, yolk weight, feed intake, and mortality but egg production and daily egg production per hen was decreased (P <0.05).The use of white light in the room decreased egg weight, content weight and daily egg production per hen rather than other colors but increased the yolk color. Use yellow light rather than other colors in the room, resulted to decrease of Haugh unit in the flocks. In total having previous disease background in the farms resulted to that farmer tended to be more sensitive and have more attention to their farms. More attention needed in educational and training programs for farmers to produce the high quality products rather than other aspects of production.