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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Fisheries Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: fish,ractopamine,terbutaline,metaproterenol
- چکیده:
- چکیده انگلیسی: Different beta 1 and 2 adrenergic receptor agonists may be various biological and physiological effects on fish species. An experiment was designed to study the effects of feeding ractopamine, terbutaline and metaproterenol; as beta1, beta2 and less selective beta 2 adrenergic receptor agonists, respectively; on body weight gain, feed conversion ratio, concentration of biochemical parameters in the serum, gene expression of carnitine palmitoyltransferase I in liver and meat and also, fatty acids profile of filet meat of the rainbow trout. One hundred ninety two of juvenile rainbow trout were randomly assigned to 16 fiber glass tanks and fed one of four dietary treatments containing control (0), ractopamine, terbutaline and metaproterenol at levels of 10 ppm in diet for 8-week feeding trials. It was found that metaproterenol and ractopamine improved final body weight, body weight gain and feed conversion ratio of fish. The serum concentrations of phosphorus and albumin were also significantly increased by all beta adrenergic agonists and ractopamine reduced triglyceride level (p<0.05). The fatty acids level of fish filet was significantly increased by the dietary supplement of various beta adrenergic agonists (p<0.05) but ractopamine had a greater effect. The gene expression of carnitine palmitoyltransferase I in liver was significantly (P<0.05) increased by all beta adrenergic agonists. The present study showed that various beta1 and beta 2 adrenergic receptor agonists had same physiological effects on rainbow trout but it seems ractopamine, as a beta 1 adrenergic receptor, had more potential on fatty acid metabolism and growth response of rainbow trout.
- انتشار مقاله: 06-08-1395
- نویسندگان: S.M.A. Jalali,S.A.H Jalali,F. Yadollahi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Fisheries Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Antibacterial activity,Zataria multiflora,Rosmarinus officinalis,Minimum inhibitory concentration (MIC),Essential oils (EO),Anethum graveolens,Eucalyptus globulus
- چکیده:
- چکیده انگلیسی: There is a growing interest of industry to replace synthetic chemicals by natural products with bioactive properties from plant origin. The purpose of this study was to elucidate the factors affecting antimicrobial effectiveness of essential oils Rosmarinus officinalis, Zataria multiflora, Anethum graveolens and Eucalyptus globulus against food spoilage and pathogenic bacteria, Streptococcus iniae the cause of zoonotic streptococcosis in fish. Food conservation is based on an intermittent search for foods with a high nutritional quality and microbial stability and it has been reached by the control of the growth / survival of spoiling and pathogen foodborne microorganisms. Based on several reports, fish streptococcosis is currently considered as one of the main limiting factors in the aquaculture industry, due to the significant economic losses (annually more than $150 million) that these infections cause in different cultured fresh and seawater fish species worldwide. The sensitivity of S. iniae to antibacterial activity of the essential oils was determined using well diffusion assays and paper disc diffusion method. The ranges of minimum inhibitory concentration (MIC) of the oils and extracts were 3.9–250 and 7.8- 500 µg/ml and the ranges of minimum bactericidal concentration (MBC) values for the oils and extracts were found to be in the range of 7.8-250 and 15.6-500 µg/ml, respectively. The essential oils exhibited antibacterial activity against S. iniae. The essential oil of rosemary showed the strongest antimicrobial activity.
- انتشار مقاله: 12-10-1396
- نویسندگان: L. Roomiani,M. Soltani,A. Akhondzadeh Basti,A. Mahmoodi,A. Taheri; Mirghaed,F. Yadollahi
- مشاهده