Broyler rasyonlarda antibiyotik ve probiyotik kullanılması
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1995
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Fen Bilimleri Enstitüsü
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58 7. SUMMARY : USING OF ANTIBIOTIC AND PROBIOT7C IN BROILER DIETS This experiment was conducted with supplementation of ThepaxR, FastrackR and zinc bacitracin to broiler diets. Probiotics were used at two different levels either alone or in combination with antibiotic. Effects of these supplementation on broiler performance, dressing percentages, intestinal tract and abdomial fat weight and blood cholesterol levels were determined. In this experiment, 250 day-old Ross PM:, broiler chicks were divided into ten groups. Each groups contained 25 birds. Birds were fed with izocaloric and izonitrojenic broiler chick diet between l-14th days, broiler starter diet (I) between 14- 28th days, broiler grower diet between 28-44* days and broiler finisher diet between 44-49111 days. Control group fed unsupplemented basal diet. ThepaxR (Contains Ellipsoideus strains of Saccharomyces cerevisiae, 12 xlO9 cells/g), FastrackR (contains Lactobacillus acidophilus, Streptococcus faecium, yeast and two inactive fermentation products, 15x 1010 live microorganism/g) and zinc bacitracin were added to the experimental diets. Experiment period was 49 days. Live weights and feed consumption of all groups were determined every weeks through the trial. From each group 4 male and 4 female birds were slaughtered on the 49th day. Prechill and postchill carcass weights and percentages, intestinal tract and abdominal fat weight, blood cholesterol level were determined. Addition of either probiotics or antibiotic didn't effect live weights of birds (p>0.05). But, at the 35th, 42nd ve 49th days of experiment, live weights at G3 and Gio which probiotics were treated high doses were lower than the control group. At the end of the experiment, although feed consumption and feed efficiency weren't effected significantly by treatment with probiotics and antibiotic, feed consumption of Gio was 3.0 % lower than the control group. And It was higher at G2, G9, G7, G»; 3.9, 3.6, 3.3, 3.2, % respectively than the control group. Probiotics and antibiotic treatment increased dressing percentage. They also influenced postchill percentage, but it wasn't found statistically significant.59 Probiotics and antibiotic treatment increased dressing percentage. They also influenced postchill percentage, but it wasn't found statistically significant. The effect of probiotics on abdominal fat weight was found different. ThepaxR inreased abdominal fat weight except for G4, which was treated with 0.50 % ThepaxR and zinc bacitracin. FastrackR didn't effect abdominal fat weight except for Gs which was treated with 0.20 % FastrackR and zinc bacitracin. Antibiotic increased abdominal fat weight, too. Antibiotic and 0.50 % ThepaxR supplementation decreased intestinal tract weight 2.7 % than the control group. But their effects weren't found statistically significant. Influence of probiotics and antibiotics on blood cholesterol level weren't significant. But groups which treated with probiotics and probiotics with antibiotic, blood cholesterol level were lower than the control group's. As a result of this experiment, effects of these two probiotics and antibiotic on broiler live weight, feed consumption, feed efficiency, intestinal tract weight and blood cholesterol level weren't found significantly. These additives increased dressing percentage but their effects on postchill percentage wasn't found significant. Their effects on abdominal fat weight were different. Generally, ThepaxR and zinc bacitracin increased abdominal fat weight, FastrackR didn't effect abdominal fat weight significantly. Key Words. Broiler, antibiotic, probiotic, performance, diet
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Veteriner Hekimliği