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An experiment was conducted under completely randomized design to study the effect of different levels of probiotic (500 and 1000g/feed for 1 phase (25 days) i.e. 35-60 days and at the levels of probiotic (250 and 500g/feed) as 2 phase (50 days) i.e. 60-110 days. 90 rock partridges (35 day old) were randomly distributed into three treatments and five replicates (6 birds in each replicate) with feed and water ad libitum for 75 days. During experimental period, performance, gut microflora, gut morphology and carcass characteristics of rock partridges were studied. At the end of experiment, two birds were selected from each replicate randomly and slaughtered to study the gut microflora, gut morphology and carcass traits. The experimental diets were as follows: 1= Basal diets (without feed additives), 2= Diet suppl. with probiotic 500g/t feed, 3= Diet included with probiotic 1000g/t feed, 4= Diet contains probiotic 250g/t feed and 5= Diet included with probiotic 500g/t feed. The results indicated that, during 1 phase (25d), the higher and the lower daily feed intake were significantly observed in diets containing probiotic at 1000g/t feed and control groups respectively (p<0.05). During 2 phase, the higher and the lower daily feed intake were observed the partridges consumed diets supplemented with probiotic at 250g/t feed and control groups (p<0.05). Significantly the higher and the lower daily body weight gain of rock partridges were observed in diets containing probiotic at 1000 and 500g/t feed (p<0.05). Whereas, in the 2 phase, the higher and the lower daily body weight gain of rock partridges were observed in groups with probiotic at 1000g/t feed and control groups(p<0.05). Whereas, at the end of experiment (110d), the higher and the lower live weight of partridges were observed in diet contains probiotic at 500g/t feed and control groups (p<0.05).The higher width of (villi) crypt cells were observed in birds gut while, diets containing probiotics at 250g/feed and differences were significant (p<0.05). In conclusion, in case of length of (villi) crypt cells has not been shown any differences among experimental groups. The higher lactobacillus count was observed in diets supplemented with probiotics at 500g/t feed and differences were nonsignificant. Results also showed during of 1 phase and 2 phase, application of probiotics had positive effects on gut microflora and increased feed intake, body weight gain and crypt depth too.

The Effects of Probiotic on Performance, Gut Morphology, Gut Microbial Count and Carcass Characteristics of Partridges