الفهرس 
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Abstract
This study was conducted evaluate the effect of adding different levels of yeast culture (0.5 and 1%) and fenugreek seeds (0.5 and 1%) or the mixture of both supplementations at levels of 0.5 and 0.5% of each, on performance, some carcass characteristics and digestibility of growing Japanese quail Four hundred fifty, one day old, unsexed growing Japanese quail were divided into 6 groups according to levels of fenugreek seeds and yeast culture or the mixture of both supplementations.
The sequence of the 6 dietary treatments was as follow:-Control (without additives), control supplemented with 0.5% fenugreek seeds, control supplemented with 1% fenugreek seeds, control supplemented with 0.5% yeast culture, control supplemented with 1% yeast culture, and control supplemented with mixture of both supplementations at levels of 0.5 and 0.5% of each.
Live body weight and feed intake was recorded weekly during the
experiment. Body gain and feed conversion (gm, feed/gm, gain) for each replicate within each week were calculated. No dead chicks were recorded due to the experimental treatments.
At the end of the experiment (6 weeks of age), a digestion trial was done to estimate how far dietary treatment could affect the digestibility of nutrients such as (DM, OM, CP, EE,CF and NFE).
At 6 weeks of age (end of the experiment), representative samples of birds were randomly taken, starved for about 12 hours, then individually weighed. A total number of 18 birds was slaughtered and after complete bleeding, the birds were scalded and feathers were plucked. Carcasses were eviscerated, heads and shanks were separated, then the carcass were chilled in tap water for about 10 minutes. Eviscerated carcasses were individually weighed and dressing percentage was calculated (weight of carcass + giblets + abdominal fat / preslaughter weight × 100). Percentage of giblets (liver + gizzard + heart) and offal’s were calculated in relation to live weight.
The economical efficiency was calculated by Egyptian pound (L.E) according to the prices of year 2015.
Obtained results declare that supplementing of fenugreek seeds at the levels (0.5 and 1%) yeast culture at the levels(0.5 and 1%) and or the mixture (0.5 and 0.5%) during different ages to growing Japanese quail dids:
1- The greatest (P≥0.05) body weight was recorded for birds fed the dietary mixture of both feed supplementation followed by birds fed dietary 1%fenugreek seeds.
2- The higher (P≥0.05) levels of yeast of fenugreek seeds recorded the best (P≥0.05) values of body gain in comparison with the low level of each and the control diet.
3- During the entire period of the experiment (0 to 6 weeks of age), the greatest (P≤0.05) feed intake was recorded for birds fed the dietary1% fenugreek seeds followed by mixture diet and 0.5% dietary yeast culture compared with other dietary treatments.
4- The best (P≤0.05) feed conversion was calculated for birds fed either 0.5% fenugreek seeds supplementation or control diets compared with other dietary supplementation during the whole experimental periods (0 to 6 weeks of age).
5- Birds fed dietary 0.5% yeast culture recorded the best absolute weights of edible giblets compared with other dietary treatment.
6- Birds fed dietary 1% yeast culture recorded the best (P≤0.05) value of dry matter digestibility followed by birds fed dietary 0.5% Yeast culture compared with other dietary treatments.
7- Birds fed either yeast culture at all levels or mixture of yeast culture and fenugreek seed in their diets recorded the greatest (P≤0.01) crude fiber and crude protein digestibility compared with compared with other dietary treatments.
8- The greatest (P≤0.01) values of ether extract digestibility were recorded for birds fed diets contain 0.1% yeast culture and 0.5% fenugreek seed.
9- Adding yeast culture or fenugreek seed to growing Japanese quail diets at all levels except 0.5% fenugreek seeds, did not improved (P≤0.05) the values of nitrogen free extract digestibility compared to the control diet.
10- Adding fenugreek seed to growing Japanese quail diets at level of 0.5% recorded the highest values of economical efficiency, relative economical efficiency percent and net revenue followed by chicks fed control diet compared with other dietary treatments.