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    Effect of an addition of phytase to diets with variable zinc and low phosphorus content on performance, carcass characteristics and bone mineralization of broilers
    (ECOLE NATIONALE VETERINAIRE TOULOUSE, 2004) Cufadar, Y; Bahtiyarca, Y
    A 6-week experiment with 960 unsexed one day-old broiler chicks was conducted to evaluate the effect Of Microbial phytase (Natuphos 500) on the performance. carcass characteristics and toe ash as a measure of bone mineralization when varying levels of zinc (Zn) and low phosphorus content in diet were used. Twelve treatments consisting of three levels of Zn (40. 60 and 160 mg/kg diet) and four levels of phytase (0, 500, 1000 and 1500 U / k2 diet) in 3 x 4 factorial arrangement were used with four replicates of twenty birds each. Increase of the dietary zinc content resulted in a non-significant reduction in the body weight gain (BWG), feed consumption (FC). weights of the carcass, neck, thighs, back + breast and a significant decrease (P< 0.05) in weight of wings. There was also a tendency of increasing feed/gain ratio and toe ash percentage. On the other hand. supplemental phytase induced significant increases of FC during the first (0 to 3 weeks), the second (4 to 6 weeks) periods and during all the experimental duration. and significant decreases of feed/gain ratios (for the second period and for all the experimental period). Carcass weights and their components were also increased by phytase supplementation (p < 0.05-0.01). The differences among Supplemental phytase with respect to these parameters have not been significant. In the experiment, significant Zn level x phytase level interactions (P< 0.05) have been observed for BWG. BWG have been significantly improved by phytase addition at three dietary Zn levels whatever the age period considered and the effects of this interaction on the BWG were different during the different age periods. Also. the negative impacts of increasing Zn levels on FC feed/ gain ratio and carcass traits (P> 0.05) have been completely corrected by inclusion of phytase to diets. The results indicate that supplementing microbial phytase to broiler diets with various levels of Zn has improved growth performances and carcass traits.
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    Effects of phytase on the performance and availability of phosphorus in corn-soybean meal diets by young Japanese quails
    (EUGEN ULMER GMBH CO, 1997) Bahtiyarca, Y; Parlat, SS
    An one experiment were conducted to evaluate of the effect of supplementing microbial phytase to corn + soybean meal based diets containing different levels of available phosphorus (AP) on the performance and utilization of phosphorus in young Japanese quail. Nine treatments consisting of three levels of AP (0.25, 0.35, 0.45%) and three levels of phytase (0, 0.05, 0.1%) ill 3x3 factorial arrangement were used with ten quails replications per treatment. The research was terminated on 30(th) days old. Phytase supplementation at 0.1% level of diets containing 0.45 and 0.35% AP were significantly increased body weight (p < 0.05), and decreased feed:gain ratio and also improved tibia ash and breaking strength in comparation with control group fed 0.45% AP without phytase. But differences in groups weren't found to be significant. When the diet with 0.25 AF was supplemented phytase, growth rate of quails were positively effected and the results were found to be similar or slightly high than control group, and also feed : gain ratio were improved but differences in groups didn't significant. Bone ash was decreased with 0.25% AP with 0.1% phytase (p < 0.05) but breaking strength of tibia wasn't significantly effected with phytase.
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    Effects of sex and protein and energy levels in the diet on the blood parameters of the chukar partridge (Alectoris chukar)
    (CARFAX PUBLISHING, 2004) Ozek, K; Bahtiyarca, Y
    1. The effects of sex and dietary composition were investigated in 48 male and 48 female 16-week old chukar partridges. 2. Sixteen starter and 16 grower diets were arranged in a 4 x 4 factorial design with 4 concentration of crude protein (CP) and 4 concentration of metabolizable energy (ME). 3. Blood samples were collected at 16 weeks of age and analysed for total protein, triglycerides, uric acid, total cholesterol, glucose, calcium, phosphorus, sodium, potassium and chlorine. 4. There were no significant effects of sex on the measured parameters. 5. Serum total protein was highest in partridges fed on a diet containing 200/175 g CP/kg (starter grower). Serum cholesterol concentrations of partridge fed the diet with 240/200 or 280/225 g CP/kg were significantly higher than that for partridge fed diets containing a lower g CP/kg. 6. Serum total protein and glucose levels significantly decreased as dietary energy level was increased. Serum triglycerides and calcium were highest in partridge fed on the diets containing 13.39/13.81 and 11.71/12.55 ME MJ/kg, respectively. Serum phosphorus and chloride levels were highest in partridges given the diet containing 10.88/11.92 ME MJ/kg. 7. There were significant interactions between the effects of CP and ME on serum triglycerides, sodium and potassium levels. 8 The results of this study suggested that dietary CP, and especially ME concentration, significantly affect blood parameters in chukar partridge.