The present study was carried out in a private commercial broilers farm at Berket EL-Saab city, Menoufia governorate, Egypt, during the period from May to June 2019. The aim of this study was to investigate the impacts of adding two vegetable oils, linseed or sunflower, in broiler diets, on growth performance, some blood components, some carcass traits, immunity and economic efficiency. A total number of one hundred and eighty, one day old unsexed Arbor Acres broiler chicks were used in this study. Chicks were individually weighed, wing banded and randomly assigned to three treatments (T 1 , T 2 and T 3 ), 3 replicates pens of 20 birds each nearly similar in average body weight (42g). Two vegetable oils, linseed or sunflower, were added at the level of 3% in broiler diets. The experimental groups were as follows: T 1 : Control (basal diet without oil), T 2 : basal diet with 3% linseed oil and T 3 : basal diet with 3% sunflower oil. Results revealed that body weight, body weight gain, feed conversion ratio and performance index were significantly improved (P ≤ 0.05) with the addition of vegetable oils from 1 -35 days of age compared to the control birds. Birds fed linseed oil had higher values of white blood cells (WBCs), total cholesterol, triglyceride and high density lipo-protein (HDL), while low density lipo-protein (LDL) was the lowest value compared to the other groups. Linseed or sunflower oils addition significantly and liver %, while dressing percentage, heart and gizzard % were not affected. Immune organs proportion (spleen, thymus and bursa %) were significantly (P ≤ 0.05) increased when birds received linseed oil supplement compared to birds fed sunflower oil supplement or basal diet (control). Chicks fed linseed oil treatment recorded the highest relative economic efficiency (108.20 %), followed by chicks fed sunflower oil (103.28), considering the control group as 100%.It could be concluded that supplementation of 3% linseed oil to the broiler diets can be used with no adverse effects, and with improving body weight, feed conversion ratio, performance index and increasing the proportion of immune organs and relative economical efficiency.

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An experiment was conducted to investigate the effect of some herbal plant's powder; garlic (Allium sativum), thyme (Thyme vulgaris) and their mixture in broiler diets on growth performance, carcass traits, some blood components and economical efficiency. A total of 210 unsexed Arbor-Acers 1 day old broiler chicks were randomly distributed into 7 comparable groups, 30 chicks each. Each group was fed one of seven diets during the experimental period (from 1 to 35 days of age). Diet 1, control (with no garlic or thyme powder supplementation) while diets from 2 -7 contained garlic or thyme as follows: diet 2: control diet + 1% garlic; diet 3: control diet + 2 % garlic; diet 4: control diet + 0.2 % thyme; diet 5: control diet + 0.4 % thyme; diet 6 : control diet + 1 % garlic + 0.2 % thyme; diet 7: control diet + 2 % garlic + 0.4 % thyme. Results revealed that increasing dietary garlic or thyme significantly (P ≤ 0.05) improved body weight (BW), body weight gain (BWG), performance index (PI) and feed conversion (feed/ gain). While, feed intake was significantly (p ≤ 0.05) decreased with increasing dietary garlic or thyme. Also, water consumption and some blood serum components were significantly affected by the addition of garlic or thyme. Dressing percentage was not affected, while, lymphoid organs weight were significantly increased with increasing dietary garlic or thyme. Findings of this study indicate that broilers consuming control diet can achieve maximum performance and economic efficiency when supplemented with 0.4% thyme (group 5) without any side effects.

The present experiment was carried out in order to investigate the effect of polyzyme (multi enzymes) in broiler diets with low protein levels on growth performance, carcass traits, some blood components and economic efficiency. A total of 180 Ross 308 unsexed one -day old broiler chicks, were distributed at random into 3 groups each in 3 replicates, 20 chicks each. Treatments were: T 1 : positive control, without Polyzyme, T 2 : negative control, without Polyzyme and T 3 : negative control, with o.5 g Polyzyme/ kg diet through the starter (1-21 d) and finisher (22-35 d) period. Results revealed that, chicks fed the negative control with polyzyme addition had significantly (P ≤ 0.05) higher body weight, body weight gain and performance index, while daily feed intake decreased. Feed conversion ratio, European efficiency index and economic efficiency improved also with the supplementation. Dressing, liver and heart % were increased in the same treatment (T 3 ), while gizzard % was not affected. Polyzyme supplementation to low protein diet decreased serum total cholesterol and increased aspartic transaminase (AST) enzyme compared to the positive control (T 1 ), meanwhiletotal protein, creatinine, glucose and alanine transaminase (ALT) enzyme were not affected, indicating the safety use of polyzyme at the level of 0.5 g/ kg diet. Data indicated that the beneficial economical effect of using polyzyme with low protein diet is to reach almost the same performance with normal protein diet.

The present experiment was conducted in order to investigate the effect of Moringa Oleifera Leaves powder on the performance, some blood serum components, some histomorphological measurements and economic efficiency of broiler chickens. A total of 225 Cobb unsexed one -day old broiler chicks, were distributed at random into 5 treatments each in 3 replicates, 15 chicks each. Moringa Oleifera leaves powder (MOL) was added at the levels of 0, 0.25, 0.50 and 0.75% to low crud protein diet (LCP, 20 and 17%, negative control) compared to the normal crud protein (23 and 20%, positive control), respectively at the starter (1-21 d) and at the finisher (22-35d) period. Results indicated that, chicks fed the low crude protein diet supplemented with Moringa Oliefera leaves powder (MOL) had significantly (P ≤ 0.05) higher body weight, body weight gain, daily feed intake and performance index. Feed conversion ratio, European efficiency index and relative economic efficiency were also improved with the supplementation. Chicks fed low crude protein diet supplemented with 0.25 or 0.50% MOL have the highest dressing weight (1753 and 1738g) with no significant differences between them compared and increased serum total protein and glucose levels, while significantly decreased serum total cholesterol and aspartic transaminase (AST) enzyme compared to the other treatments with increasing the levels of MOL up to 0.50%. Morphological sections of small intestine revealed that villi height, width and height: width ratios were increased by the supplementation of different levels of MOLM (0.25 and 0.50%) but not significant except in duodenum villi width and in the ration between height and width.In general, the obtained results indicated that supplementation of 0.25% Moringa Oliefera Leaves, MOL can be used in broiler diets with low protein level to get the heaviest weight, best feed conversion, performance index, due to an increase in small intestinal absorption and activity. This, in turn, resulted in an increase in European efficiency index and economic efficiency under the experimental conditions.