الفهرس 
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Abstract
The poultry industry is one of the largest food industries in the world at the present time and in the near future, by the year 2050, it is expected that the proportion of poultry meat production will reach 121% of the production in 2005. Many countries in the world will witness great prosperity and growth in this industry (FAO, 2022) due to the increase in the high consumption of white meat and because of its relative benefits, which include high nutritional value and quality, great taste, low fat percentage, fast production period, low production costs, rapid economic progress and cheap prices even for the poorest members of society. Poultry meat production increased from 9 to 132 million tons, from 1961 to 2019. The United States, China and Brazil are the largest producers of poultry meat in the world, with a rate of up to 17% of global production (FAO, 2022). In Egypt, the annual growth increases at an average rate of 6.37%, as its poultry meat production increased from 84,075 tons in 1970 to 1.45 million tons in 2019.
In order to keep up with and increase production, many had to breed with high density per square meter, and then most of the studies and researches continued, which indicated unsatisfactory results and indicators in the behaviour of birds and the appearance of unacceptable behaviours among birds, then others on productive performance and physiological changes such as a defect in the immune system.
Here, some studies resorted to studying the use of environmental enhancements that are stimuli such as the elevated platform to avoid the negative effects that appear from high-density breeding and improve behavioural and productive performance, achieve more well-being, develop immunity, health status, and reduce tension between birds.
Hypothesis:
Adding the elevated platform with groups of high-density birds to reduce the negative effects of high-density rearing that broiler chickens are exposed to.
Aim of the study:
:1Determining the effect of elevated platform on behavioural performance, productivity and physiological changes in broiler chickens reared under high density.
2: Determine the extent of the economic benefit of using the elevated platform to reduce the effects of high density.
Experimental Design:
The study was conducted in 2021 with 207 five-day-old chicks (Ross 308 strain) from Al-Wadi Trading Company for hatching. The chicks were weighed and distributed into 3 treatments (low density treatment 10 birds / 1.5 m2, the second high density treatment 18 birds / 1.5 m2, and the last high density treatment with the raised platform at a rate of 18 birds / 1.5 m2) Each treatment included 3 groups, and the study continued for five weeks. where behavioural, performance, and physiological changes were recorded, and an assessment of the level of well-being and health and sthe legs health was conducted, as 2 birds were slaughtered from each group in order to weigh the internal organs and collect the leg bones, and blood samples were collected to evaluate the physiological changes.
Results:
:1 Behavioural changes:
The results showed that the high density showed a negative effect on some behaviours such as eating, drinking, locomotion and aggressive behaviours had recored, while the addition of the elevated platform showed a positive effect on improving eating and movement behaviour and reducing the chances of aggressive clicking for birds.
:2performance:
The results showed that the high density and the elevated platform showed a negative effect on some productive performance, while there was no increase in the internal organs (liver, spleen, gizzard and heart).
3: Physiological blood measurements:
The results showed that the high density showed a negative effect on some physiological blood parameters, such as increasing the percentage of corticosterone, glucose, and the percentage of lymphocytes, and reducing the immunity of the bird through the lack of antibodies to Newcastle disease, while the addition of the elevated platform showed a positive effect in relieving stress by decreasing the levels of corticosterone, glucose, the percentage of lymphocytes, and improving bird immunity by increasing antibodies to Newcastle disease.
4: Measuring the level of welfare and health of the legs
The results showed that the high density showed a negative effect on some levels of well-being by increasing the fear of birds and increasing walking problems and inflammation in the footpad and hock, while the addition of the high platform showed a positive effect in reducing fear and avoiding walking problems and inflammation of the footpad and hock.
:5 The quality of the tibia and femur bones:
The results showed that the high density and theelevated platform did not lead to any change in any measurements of the femur and tibia.