The Effect of Kefir as a Dietary Supplement on Nonspecific Immune Response and Disease Resistance in Juvenile Rainbow Trout,Oncorhynchus mykiss (Walbaum 1792) |
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| Authors: | Gülşen Uluköy Seçil Metin Ayşegül Kubilay Şefik Güney Pınar Yıldırım Zeynep Güzel‐Seydim Tugba Kok‐Tas Erkan Gümüş |
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| Affiliation: | 1. Department of Aquaculture, Fisheries Faculty, Mugla S?tk? Kocman University, Mugla, Turkey;2. Department of Aquaculture, Egirdir Fisheries Faculty, Suleyman Demirel University, Isparta, Turkey;3. Department of Food Engineering, Engineering Faculty, Suleyman Demirel University, Isparta, Turkey;4. Department of Aquaculture, Fisheries Faculty, Akdeniz University, Antalya, Turkey |
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| Abstract: | In this study, juvenile rainbow trout fed with commercial pellets containing kefir provided increased nonspecific immune response and improved disease resistance against lactococcosis and yersiniosis. Kefir was used as a feed supplement at 2, 5, and 10% inclusion rates and several nonspecific immune parameters were observed at day(s) 1, 7, 14, 21, 28, and 35 following the treatment. A total of four experimental groups, including control, was established. The various parameters including hematocrits, nitroblue tetrazolium positive neutrophils, total leukocytes, serum lysozyme activity, total serum protein, and immunoglobulin M (IgM) levels were examined. As a result of this study, kefir‐fed fish had an increase in measured nonspecific immune parameters, especially in the group received the 10% kefir treatment. The challenged fish fed with kefir‐supplemented diet showed a better survival rate against Lactococcus garvieae than Yersinia ruckeri. Kefir supplementation reduced fish mortality significantly against L. garvieae. |
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