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Articles by M. Karaoglu
Total Records ( 3 ) for M. Karaoglu
  M.A. Yoruk , M. Gul , A. Hayirli and M. Karaoglu
  This study was conducted to determine effects of dietary NaHCO3 supplementation on egg production and egg quality during the late laying period. Hisex Brown layers, 54 wks of age, were blocked according to the cage location and then assigned randomly to receive one of four diets containing 0, 0.1, 0.2, or 0.4% NaHCO3 for 75 d. Each diet was replicated in 6 groups; each consisting of 2 cages containing 10 hens. Feed intake (FI) and egg production (EP) were recorded daily and egg weight (EW) was measured bi-weekly. A sample of 12 eggs from each group were collected randomly every 25 d for specific gravity (SG), shape index (SI), shell stiffness (SS), shell thickness (ST), yolk color (YC), albumen index (AI), yolk index (YI) and Haugh unit (HU). The mortality rate (MR) and feed conversion ratio (FCR) were lower, whereas FI, EP and EW were greater for hens fed the experimental diets than those for hens fed the control diet. Moreover, increasing NaHCO3 level linearly decreased MR and FCR, linearly increased EP and EW and quadratically increased FI. Specific gravity and YI for hens fed the experimental diets were lower than for fed the control diet. The diets did not affect SI, SS, ST, YC, AI and HU. However, SG and YI decreased linearly and AI increased linearly with increasing NaHCO3 level. In conclusion, increasing sodium bicarbonate level positively affected laying performance and altered inner egg quality, but did not improve shell quality, during the late laying period in hens.
  M. Karaoglu and H. Durdag
  The present study was carried out to determine the influence of dietary probiotic (115-Biogallinox; containing Saccharomyces cerevisiae at 4 x 108 colony forming units/g) on growth, slaughter and carcass characteristics of broilers slaughtered at different ages (35, 42 and 49 days). Day-old male Ross-308 chicks (n = 336) were weighed and randomly assigned to three dietary treatment groups [P0 (control): 0 g probiotic/kg; P1: 1 g probiotic and P2: 2 g probiotic/kg] as a 3x3 factorial arrangement. Each treatment group was replicated eight times as subgroups, comprising of 14 birds each. The broiler chickens were grown on starter (0 to 21 days) and finisher (to 35, 42 and 49 days) diets calculated to meet NRC recommendations. Body weight and feed consumption were determined weekly during the study. Means to slaughter age of body weight, daily weight gain, daily feed consumption, feed efficiency and mortality were 2524.5, 50.7, 94.4 g, 1.86 and 1.8% for P0 group; 2559.1, 51.4, 94.8 g, 1.85 and 0.0% for P1 group; 2548.3, 51.2, 95.9 g, 1.88 and 1.8% for P2 group, respectively. None of the live performance variables investigated differed significantly between control and probiotic treatment. Similarly, probiotic treatment had no effect on the hot and cold carcass weight, carcass yield and the weight of carcass cuts and the abdominal fat pad. Means for these slaughter variables were 1543.8, 1521.3 g, 74.0, 73.4%, 31.0 g for P0 group; 1561.1, 1539.4 g, 74.2, 73.6%, 30.2 g for P1 group; 1558.7, 1535.2 g, 74.1, 73.5% and 31.0 g for P2 group, respectively. However, slaughter age had a highly significant effect on the final body weight slaughter variables mentioned above. In this experiment probiotic supplementation of broilers, up to the level of 4 x 108 colony forming units/kg feed, did not significantly affect the live performance and slaughter variables investigated.
  M.A. Yoruk , M. Gul , A. Hayirli and M. Karaoglu
  This experiment was conducted to evaluate the effects of multi-enzyme supplementation on laying performance, metabolic profile and egg quality of peak producing hens. Lohman layers (n = 144) were blocked according to the location of cages. After one week of the adaptation period, hens were randomly assigned to receive one of three corn-soybean meal based diets supplemented with multi-enzyme (0, 1, or 2 g/kg) from 30 to 46 weeks of age as 12 replicate cages of 4 hens. The active ingredients of the multi-enzyme supplement were fungal xylanase, fungal β-gluconase, alpha-amylase, pectinase, β-gluconase, endo- β-gluconase, pentosonase, pectinase and hemicellulase. Egg production (EP) and feed intake (FI) were measured daily and egg weight was measured fortnightly. Feed conversion ratio (FCR) was expressed as kilogram of feed consumed per kilogram of egg produced. Two eggs were collected randomly from each cage every 4 weeks to determine egg quality. Body weights (BW) were measured at the beginning and end of the experiment. Blood was also sampled at the end of the experiment to evaluate metabolic profile. The data were analyzed using ANOVA as repeated measures with time being as subplot. The multi-enzyme supplementation did not affect BW, FI and EP; decreased FI; and improved FCR. Except for serum albumin and yolk index, none of metabolic profile and egg quality parameters was affected by the dietary treatments. In conclusion, despite no changes in egg production, decreased feed intake and consequently, improved feed conversion in response to multi-enzyme supplementation could be attributed to enhanced utilization of nutrients.
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