TY - JOUR T1 - Effects of GroBiotic®-A supplementation on growth performance, body composition and liver and intestine histological changes in European Seabass (Dicentrarchus labrax) juveniles TT - Grobiyotik A ilavesinin levrek (Dicentrarchus labrax) juvenillerinde büyüme performansı, vücut kompozisyonu, karaciğer ve bağırsak histolojik değişimleri üzerine etkileri AU - Yazıcı, Metin AU - Mazlum, Yavuz AU - Naz, Mehmet AU - Sayın, Selin AU - Ürkü, Çiğdem AU - Akaylı, Tülay PY - 2020 DA - December DO - 10.12714/egejfas.37.4.10 JF - Ege Journal of Fisheries and Aquatic Sciences JO - EgeJFAS PB - Ege University WT - DergiPark SN - 2148-3140 SP - 389 EP - 396 VL - 37 IS - 4 LA - en AB - The effects of GroBiotic®-A supplementation on growth performance, body composition, liver and intestine histology in European seabass (Dicentrarchus labrax) juveniles were evaluated. The commercial GroBiotic®-A was added to diets at four different levels (0, 1, 2 and 3%), three replicates and fed 4 times a day (9:00, 11:30, 14:00, 16: 30 hours) for 60 days as ad libitum. Total 480 European seabass juveniles with a starting weight of 1.40±0.08 g were randomly stocked into 12 tanks with a volume of 1 m3. At the end of the study, the changes observed in weight, feed conversion ratios (FCR) and survival rates were calculated as 6.69 ± 5.35-7.40 ± 5.47, 0.80 ± 0.18-0.88 ± 0.20 and 96.6 ± 1.51-100 ± 0.0, respectively. When the body composition of the control and treatment groups were compared, no statistically significant differences were observed between the protein and lipid values (p>0.05), except ash (p <0.05). Histological sections of intestinal tissue; the number of goblet cells was higher than that of the control group. The highest values were determined in the group supplemented 2% GroBiotic®-A. The highest microvillus length was found in the group added 1% GroBiotic®-A. It was detected an inverse relationship between microvillus length and contribution rates as the the GroBiotic®-A additive levels increased. Also, degeneration and necrosis was detected in hepatocyte cells of seabass juvenile fed with diets supplemented 2% and 3% GroBiotic®-A as well as increase of the number of fatty vacuoles in liver tissue due to the increase in the amount of GroBiotic®-A. In conclusion, when the growth parameters, body composition and histological data were evaluated together, the feeding group supplemented 1% GroBiotic®-A performed the best. KW - Grobiotic A KW - European sea bass KW - growth KW - histology KW - aquaculture N2 - Ticari bir prebiyotik olan Grobiyotik-A ilavesinin levrek (Dicentrarchus labrax) juvenillerinde büyüme performansı, vücut kompozisyonu, karaciğer ve bağırsak histolojik değişimleri üzerine etkileri değerlendirilmiştir. Grobiyotik-A, dört farklı seviyede (%0, 1, 2 ve 3) yemlere eklenmiştir ve günde 4 kere (9:00, 11:30, 14:00, 16: 30 saatlerinde) doyana kadar 60 gün boyunca besleme yapılmıştır. Çalışma 3 tekrarlı olarak yürütüldü. Başlangıç ağırlıkları 1,40±0.08 g olan kırk levrek rastgele 1 m3 hacimli 12 tanka stoklandı. Çalışma sonunda ağırlıkta gözlenen değişiklikler, yem dönüşüm oranları (FCR) ve yaşama oranları sırasıyla 6.69 ± 5.35-7.40 ± 5.47, 0.80 ± 0.18-0.88 ± 0.20 ve 96.6 ± 1.51-100 ± 0.0. olarak ölçülmüştür. Kontrol ve deneme gruplarının vücut kompozisyonları karşılaştırıldığında protein ve lipit değerleri arasında istatistiksel olarak anlamlı bir fark gözlenmezken, kül değerlerinde gözlenmiştir (p <0.05). Bağırsak dokusunun histolojik kesitlerinde; goblet hücrelerinin sayısı kontrol grubuna göre daha yüksek bulunmuştur. En yüksek değerler %2 Grobiyotik-A eklenen grupta tespit edilmiştir. Mikrovillus uzunluğu, en yüksek %1 Grobiyotik-A eklenmiş grupta bulunmuştur. 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