The effect of feeding different mixture powder levels of red and black pepper as natural feed additives on productive performance, carcass characteristics and economical efficiency were studied. A total of one hundred and sixty one-day old, unsexed (Ross-308) broiler chicks were randomly divided into four experimental groups. Each group was further subdivided into five replicates at the rate of eight chicks per pen in complete randomized design. The birds were fed on two basal diets (starter and finisher diet). The red pepper (Capsicum annum.L) and black pepper (Piper nigrum.L) were added in different mixture levels to the basal diets resulting in four experimental groups. The first group (A) fed on basal diets without feed additives (control diet). The other groups (B), (C) and (D) were fed on basal diets supplemented with different mixture powder levels of 0.4% (0.2% red pepper + 0.2% black pepper), 0.6% (0.3% red pepper + 0.3% black pepper) and 1% (0.5% red pepper + 0.5% black pepper) respectively. The experimental diets were fed for 6-weeks duration. Health of the stock and performance parameters were recorded. At the end of the experiment, the birds were slaughtered, dressed then used for different parameters and economical evaluation were calculated. The results showed that, the diet with 1% mixture powder of red and black peppers had significantly (P<0.05) heaviest body weight gain, higher feed intake, best feed conversion ratio, highest dressing percentage, highest percentage of commercial cuts (breast, drumstick and thigh) with the highest percentages of liver and gizzard. The birds fed with the control diet produced significantly (P<0.05) highest abdnominal fat percentage. The mortality rate was not significantly affected by the inclusion of mixture of red and black peppers powder in broiler diet. The highest profitability ratio (1.81) was obtained by the diet supplemented with 1% mixture powder level. It was concluded that using a mixture as feed additives at level 1% enhance the overall performance and carcass quality of broiler chicken.

The effect of feeding broiler chicks on diets containing antibiotic and different levels of anise oil as feed additive on productive performance, carcass characteristics and economical efficiency were studied. A total of two hundred and fifty one-day old, unsexed (Ross-308) broiler chicks were randomly divided into five experimental groups. Each group was further subdivided into five replicates ten chicks per pen in complete randomized design. The birds were fed with two basal diets (starter and finisher) to form five experimental groups. The first group (A) fed on basal diet without feed additives (negative control diet), the second group (B) fed on basal diet with 0.1% added antibiotic Neomycine sulphate (positive control diet). The other groups (C), (D) and (E) were fed on basal diet supplemented with anise oil (Pimpinella anisum) at levels (150, 250 and 400 ppm) respectively. The experimental diets were fed for 6-weeks duration. Health of the stock and performance parameters were recorded. At the end of the experiment, the birds were slaughtered, dressed then the different parameters and economical evaluation. The results showed that, the diet with 400ppm anise oil had significantly (P<0.05) heaviest body weight gain, highest feed intake, best feed conversion ratio, highest dressing percentage with highest percentages of commercial cuts (breast drumstick and thigh). In addition, the inclusion of anise oil in broiler diets showed significantly (P<0.05) the most tender breast and thigh meat and higher liver and gizzard percentages compared to both antibiotic and control diets. The birds fed the antibiotic and control diets produced significantly (P<0.05) highest abdominal fat percentage. The mortality rate did not significantly (P>0.05) affected by the experimental treatments. The highest profitability ratio (1.85) was recorded by the diet with 400ppm anise oil in broiler diet.

The effect of feeding broiler chicks diets containing different levels of ginger powder as natural feed additive on productive performance, carcass characteristics and economical efficiency was studied. A total of two hundred one-day old, unsexed (Ross-308) broiler chicks were randomly divided into four experimental groups. Each group was further subdivided into five replicates at the rate of ten chicks per pen in complete randomized design. The birds were fed with two basal diets (starter and finisher diets). The ginger powder (Zingiber officinale) was added to the basal diets at level (0.0, 1, 1.5 and 2.0%) resulting in four formulae respectively to groups A, B, C and D with group A serving as control group. The experimental diets were fed for 6-weeks duration. Health of the stock and performance parameters were recorded. At the end of the experiment, the birds were slaughtered, dressed then used for different parameters and economical evaluation were calculated. The results showed that, the diet with 1% ginger powder had significantly (P<0.05) heaviest body weight gain, higher feed intake, best feed conversion ratio, and highest dressing percentage with the highest percentage of commercial cuts (breast drumstick and thigh). The birds fed the control diet produced significantly (P<0.05) highest abdominal fat percentage. The mortality rate was not affected significantly by the inclusion of ginger powder in broiler diet. The highest profitability ratio (1.30) was obtained by the diet with 1% ginger powder. Inclusion of ginger powder at level 2% in broiler diet had adverse effect on growth performance.

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