الفهرس 
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Abstract
The present study was carried out at Poultry Research Farm of Poultry Production Department, Faculty of Agriculture, Assiut University, Assiut, Egypt during the period from April to June, 2018.
The objective of this experiment was to study the effect of using some organic acids on broiler chickens performance.
Two hundred eighty-six, unsexed, one-day old Cobb broiler chicks were used. All chicks were wing banded, individually weighed and randomly distributed into 5 groups, (control and 4 treatments). Each group included three levels of organic acids (0.5, 0.75 and 1.0%). Each level included 2 replicates of 11 chicks each. Each replicate was kept in a partition of 2 square meter provided with wheat straw litter of 5 cm depth. The chicks were maintained under a regimen of 24 hours continuous lighting (Incandescence lambs,
60 watts at 180 cm from the floor) with ad-libitum feed and water. The five experimental groups were as follows:
group 1 (Control):
The birds fed a commercial diet (starter and grower) as NRC requirements recommended level (diet 1).
group 2:
The birds fed a diet 1 + Acetic acid at level of 0.5, 0.75 and 1% in water.
group 3:
The birds fed a diet1 + Tartaric acid at level of 0.5, 0.75 and 1% in feed.
group 4:
The birds fed a diet1 + Formic acid at level of 0.5, 0.75 and 1% in water.
group 5:
The birds fed a diet1 + Citric acid at level of 0.5, 0.75 and 1% in feed.
Studied Criteria:
The experiment parameters were as follows:
Body weight, body weight gain, feed consumption, feed conversion ratio, carcass criteria and chemical composition of breast, femur and drumstick meat, blood parameters and bacterial counts.
The achieved results:
1- At 35 days of age, the highest BW value (2237.8g) was recorded for birds were received citric acid at level of 1.0%, while, the lowest value (1733.9 g) was recorded for birds were fed formic acid at level of 0.75%.
2- Regarding BWG, the highest BWG value was recorded for birds received acetic acid at level 1.0% (796.91g) followed by formic and Citric acid (772.14g and 772.05g, respectively) followed by tartaric acid (764.3 g) at the same level. The lowest value was obtained (427.1 g) for birds received formic acid at level of 0.5%.
3- Regarding FC, the lowest FC value (826.16 g) was recorded for bird received citric acid at level of 0.5%, while, the highest value (1125.9 g) was recorded for birds received citric acid at level of 1.0%.
4- No significant differences between dressed carcasses were detected between acetic, tartaric acids and control group.
5- The obtained results showed that significant differences (P<0.0001) in liver and gizzard ratio and weights by using the organic acids.
6- The achieved results showed the average of bursa weight of Formic acid treatment was significantly higher (P<0.0001) as compared with the other treatments.
7- The average of breast weight of citric acid treatment was numerically better than that of formic, citric, tartaric acids and control group by 34.4, 28.9, 16.9 and 26.1% respectively.
8- Numerically, the obtained results showed that the blood total protein was increased in treated groups than control, while globulin (g/L), A/G and albumin values were increased significantly by using the organic acids than the control group.
9- The effect of organic acids on antibacterial counts which significantly (P<0.001) reduction in total bacterial and gram negative bacterial counts in broiler chicken in some treatments.
10- The use of organic asides in broiler diets decreased the PH number but insignificant.