الفهرس 
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Abstract
The current study was conducted at the College of Agriculture and Veterinary Medicine - Qassim University - Saudi Arabia. To evaluate the effect of probiotics on carcass quality and gut microflora in broiler chicks. In the period between July and August of 2013. 1920 of the unsexed one-day-old chicks of the Ross 308 strain were obtained from one of the largest poultry companies in the Kingdom of Saudi Arabia, and a commercial type of probiotic called GalliPro was used that was purchased from a veterinary drug agency over there. This commercial type of probiotics was added to the starter and grower feed at concentrations (0, 200, 400 g / ton diet). The chicks were distributed randomly into three treatments, each treatment contained eight replications, and the experiment lasted for 6 weeks (42 days) and focused on evaluating many characteristics, the most important of which are: growth characteristics, mortality rate, quality characteristics of the carcass, microbiological analysis, blood analysis, and ammonia concentration inside the chicks housing.
1- Growth characteristics were evaluated, the most important of which were: live body weight (BW), which was significant in the second and third weeks (P = 0.03, 0.01) for the two consecutive weeks, while no statistically significant differences were found in the rest of the weeks until the end of the experiment. 400 grams of probiotics/ton diet is the highest in the average live weight in those weeks, where it was recorded (466.84, 880.84 g), superior to the concentration (200 g / ton), where it was recorded (446.86, 859.87 g) and the comparison treatment, which was the last with an average weight of (440.64,827.98 g) in the second and third week.
2- As for body weight gain (BWG), in periods (1-7 day) and (36-42 day) the result was significant and the 400 gm /ton diet was the best one in the first period and the 200 g/ton diet was the best in the last period.
3- With regard to the growth rate (GR). We found significant results, where the concentration (400 grams/ton) was the highest in the average growth rate in first and second periods (1-7), (8-14) day, where it was (121.23, 92.22 %), followed by the concentration (200 grams/ton) which was (118.96, 90.89 %). Then came the control factor and it was the last (116.22, 89.78 %).in last period (36-42 day) 200 gm/ton diet was the best with the result (21.21%) compare to the control (14.06 %).
4- For the feed consumption (FC) results, all outcomes were not significant, either for the period from 1 to 21 days, for the period from 22 days to 42 days, or for the whole breeding period from 1 to 42 days. As for the feed conversion rate (FCR), it was significant in the periods from one day to 21 days and also in the period from 22 days to 42 days, and we find that the concentration of 200 grams/ton was the best in the first period and also in the second period in which it competed with the comparison treatment with a slight difference between the two results, the nutritional conversion rate for the control treatment was (2.02), while the probiotic concentration was 200 g / ton (2.08).
5- Looking at the results of the mortality rate in the trial in general, we find that it is low and the mortality rate was lower by 2.67% when using a concentration of 200 g probiotic/ton compared to the control treatment, where the mortality rate was 3.02%, and the results
were generally significant.