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Liu Y, Li X, Lin J, Song K, Li X, Wang L, Zhang C, Lu K. Effects of Dietary Supplementation of Bile Acids on Growth, Glucose Metabolism, and Intestinal Health of Spotted Seabass ( Lateolabrax maculatus). Animals (Basel) 2024; 14:1299. [PMID: 38731303 PMCID: PMC11083208 DOI: 10.3390/ani14091299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/23/2024] [Accepted: 04/24/2024] [Indexed: 05/13/2024] Open
Abstract
An 8-week feeding trial was performed to investigate the effects of dietary bile acids on growth, glucose metabolism, and intestinal health in spotted seabass (Lateolabrax maculatus) reared at high temperatures (33 °C). The fish (20.09 ± 1.12 g) were fed diets supplemented with bile acids: 0 (Con), 400 (BA400), 800 (BA800), and 1200 (BA1200) mg/kg, respectively. The results showed that the growth was promoted in fish at the BA800 treatment compared with the control (p < 0.05). Increased enzyme activities and transcripts of gluconeogenesis in the liver were observed, whereas decreased enzyme activities and transcripts of glycolysis, as well as glycogen content, were shown in the BA800 treatment (p < 0.05). The transcripts of bile acid receptors fxr in the liver were up-regulated in the BA800 treatment (p < 0.05). A bile acid supplementation of 800 mg/kg improved the morphological structure in the intestine. Meanwhile, intestinal antioxidant physiology and activities of lipase and trypsin were enhanced in the BA800 treatment. The transcripts of genes and immunofluorescence intensity related to pro-inflammation cytokines (il-1β, il-8, and tnf-α) were inhibited, while those of genes related to anti-inflammation (il-10 and tgf-β) were induced in the BA800 treatment. Furthermore, transcripts of genes related to the NF-κB pathway in the intestine (nfκb, ikkα, ikkβ, and ikbα1) were down-regulated in the BA800 treatment. This study demonstrates that a dietary bile acid supplementation of 800 mg/kg could promote growth, improve glucose metabolism in the liver, and enhance intestinal health by increasing digestive enzyme activity and antioxidant capacity and inhibiting inflammatory response in L. maculatus.
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Affiliation(s)
- Yongping Liu
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
| | - Xiao Li
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
- Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture and Rural Affairs, Jimei University, Xiamen 361021, China
| | - Jibin Lin
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
| | - Kai Song
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
| | - Xueshan Li
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
| | - Ling Wang
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
| | - Chunxiao Zhang
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
| | - Kangle Lu
- State Key Laboratory for Mariculture Breeding, Fisheries College of Jimei University, Xiamen 361021, China; (Y.L.); (X.L.)
- Xiamen Key Laboratory for Feed Quality Testing and Safety Evaluation, Fisheries College of Jimei University, Xiamen 361021, China
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Zulfiqar T, Sarwar MS, Chaudhry AS, Hafeez-ur-Rehman M, El Basuini MF, Khalil HS. Effects of Different Aquafeed Sources on Growth Performance, Oxidative Capacity, and Fatty Acid Profile of Three Carps Reared in the Semi-Intensive Composite Culture System. AQUACULTURE NUTRITION 2023; 2023:3436607. [PMID: 38152155 PMCID: PMC10752687 DOI: 10.1155/2023/3436607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/17/2023] [Accepted: 11/21/2023] [Indexed: 12/29/2023]
Abstract
The current experiment is designed to evaluate the effect of different aquafeeds (farm-made versus commercial) on growth, body composition, oxidative capacity, and fatty acid profile in the semi-intensive composite culture system. For this, 1,100 fingerlings/acre having initial body weight and length, Labeo rohita (61.34 g, 171 mm), Catla catla (71.45 g, 181 mm), and Cyprinus carpio (30.80 g, 91 mm) were randomly distributed to 16 ponds and randomly fed on eight different diets (n = 2 pond/diet) in a completely randomized research design. Aquafeed were farm-based diets (D1-D2) and commercial aquafeed (D3-D8). The farm-made diets contained various crude protein levels of maize gluten (24.9%) and rice polish (7.3%), whereas commercial diets were procured from commercial feed plants (AMG, Supreme, Aqua, Star Floating, Hi-Pro, and Punjab feed). The growth performance of carps (L. rohita and C. catla) was significantly improved (p < 0.05) by feeding D3 as compared to other diets. Similarly, white blood cell concentration was greater (p < 0.05) in all species fed by D3 than in those fed on D7, D8, D5, D6, D1, and D2 fed groups, respectively. Alanine transaminase, aspartate transaminase, and alanine phosphatase activities were significantly lower (p < 0.05) in the D3-fed L. rohita, C. catla, and C. carpio compared with those fed on the rest of the treatments. The activities of glutathione peroxidase and superoxide dismutase were also higher (p < 0.05) for the D3 fed L. rohita, C. catla, and C. carpio than those fed on the rest diets. The groups fed on D3 and D4 had greater (p < 0.05) concentrations of myristic (14), palmitic acid (16), and stearic (18) acids than those fed on the rest of the commercial diets. However, meat chemical composition was similar (p > 0.05) across the treatments. These results also prove that the increase in the dietary protein level and lipid content can improve the fish's body's crude protein and fat levels. Feeding D3 improved the production performance, oxidative status, and fatty acid profile in composite major carps culture systems. Thus, based on growth, survival, and body composition, it is concluded that D3 and D4 may be recommended for a commercial culture of major carps. Dietary treatments had no significant impact (p > 0.05) on water's physical-chemical properties. Calcium content and alkalinity varied (p < 0.05), with D5 showing the lowest calcium and the highest alkalinity.
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Affiliation(s)
- Talha Zulfiqar
- Department of Zoology, Faculty of Life Sciences, University of Okara, Okara 56300, Pakistan
- Department of Fisheries and Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Muhammad Sajjad Sarwar
- Department of Zoology, Faculty of Life Sciences, University of Okara, Okara 56300, Pakistan
| | - Abdul Shakoor Chaudhry
- School of Natural and Environmental Sciences, Agriculture Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Muhammad Hafeez-ur-Rehman
- Department of Fisheries and Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Mohammed F. El Basuini
- Animal Production Department, Faculty of Agriculture, Tanta University, 31527, Tanta, Egypt
- Faculty of Desert Agriculture, King Salman International University, South Sinai 46618, Egypt
| | - Hala Saber Khalil
- Aquaculture Department, Faculty of Fish Resources, Suez University, Suez 43221, Egypt
- College of Fisheries and Aquaculture Technology, Arab Academy for Science, Technology, and Maritime Transport, Alexandria, Egypt
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Abdel-Tawwab M, Abdel-Latif HMR, Basuini MFE, El-Nokrashy AM, Khaled AA, Kord M, Soliman AA, Zaki M, Nour AE, Labib EMH, Khalil HS. Effects of exogenous bile acids (BAs) on growth, lipid profile, digestive enzymes, and immune responses of thinlip mullet, Liza ramada. Sci Rep 2023; 13:22875. [PMID: 38129552 PMCID: PMC10739904 DOI: 10.1038/s41598-023-49788-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023] Open
Abstract
An eight-week trial was designed to explore the dietary effects of commercially purchased exogenous bile acids (BAs) on growth, whole-body composition, lipid profile, intestinal digestive enzymes, liver function enzymes, oxidative stress biomarkers, and serum immunity of thinlip mullet, Liza ramada. Four triplicate groups (10.50 ± 0.05 g) were fed four soybean meal (SBM)-based diets supplied with several BAs levels at 0 (control), 50, 130, or 350 mg/kg feed. Results indicated that the growth was significantly increased in groups fed BAs-based diets, especially at 130 mg/kg feed. The body composition analysis showed that feeding fish on diets supplied with BAs up to 130 mg/kg decreased moisture (%) alongside increased crude protein (%). However, the body composition of fish fed a diet with 350 mg BAs/kg had the lowest moisture (%) and the highest crude protein (%). Moreover, there were significant increases in the intestinal (protease, α-amylase, and lipase) enzyme activities in the groups supplied with BAs up to 130 mg BAs/kg. Liver function enzymes (aspartate aminotransferase and alanine aminotransferase enzyme activities) were significantly decreased in BAs-supplemented groups compared to those fed the BAs-free group. On the other hand, the control group had higher total cholesterol, triglycerides, and low-density lipoprotein alongside the lower high-density lipoprotein than BAs-supplemented groups, especially at 350 mg BAs/kg feed. BAs significantly decreased hepatic malondialdehyde concentrations and increased the activity of hepatic catalase, superoxide dismutase, and total antioxidant capacity compared with those reared on the control diet. Serum lysozyme, respiratory burst, and alternative complement activities were significantly increased in BAs-supplied groups, particularly in the group supplied with 130 mg BAs/kg compared to those fed on the control diet. Accordingly, our findings recommend that including 130 mg BAs/kg in an SBM-based diet enhanced the growth, digestive enzyme activities, and liver functions, alleviated oxidative stress, boosted serum immunity, and lowered lipid metabolites in thinlip mullet. These findings will be beneficial for improving the quality of feed prepared for feeding mullets and an effective alternative strategy to support mullet farming.
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Affiliation(s)
- Mohsen Abdel-Tawwab
- Department of Fish Biology and Ecology, Central Laboratory for Aquaculture Research, Agriculture Research Center, Abbassa, Abo-Hammad, Sharqia, Egypt
| | - Hany M R Abdel-Latif
- Department of Poultry and Fish Diseases, Faculty of Veterinary Medicine, Alexandria University, Alexandria, 22758, Egypt.
| | - Mohammed F El Basuini
- Animal Production Department, Faculty of Agriculture, Tanta University, Tanta, 31527, Egypt
- Faculty of Desert Agriculture, King Salman International University, South Sinai, 46618, Egypt
| | - Asmaa M El-Nokrashy
- Department of Aquaculture, Faculty of Aquatic and Fisheries Science, Kafrelsheikh University, Kafr Elsheikh, Egypt
| | - Asmaa A Khaled
- Animal and Fish Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria, Egypt
| | - Mohamed Kord
- Central Laboratory for Agricultural Climate, ARC, Giza, Egypt
| | - Ali A Soliman
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Mohamed Zaki
- Animal Production Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt
| | - Abd-Elaziz Nour
- Animal Production Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt
| | - Eman M H Labib
- Utilization of By-Products Department, Animal Production Research Institute, Agriculture Research Center, Ministry of Agriculture and Land Reclamation, Dokki, Giza, Egypt
| | - Hala Saber Khalil
- Aquaculture Department, Faculty of Fish Resources, Suez University, Suez, 43221, Egypt.
- College of Fisheries and Aquaculture Technology, Arab Academy for Science, Technology, and Maritime Transport, Alexandria, Egypt.
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Khalil HS, Ahmed HO, Elkhouly N, El Basuini MF, El-Nokrashy AM, Hessein AAA, Khaled AA, Rashad AMA, Kord M, Alkenawy D, Abdel-Tawwab M, Abdel-Latif HMR. Effects of L-ascorbic acid on growth, non-specific immunity, antioxidant capacity, and intestinal and hepatopancreatic histology of red swamp crayfish, Procambarus clarkii. Sci Rep 2023; 13:21428. [PMID: 38052930 PMCID: PMC10698174 DOI: 10.1038/s41598-023-48609-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/28/2023] [Indexed: 12/07/2023] Open
Abstract
This study investigated the dietary effects of coated L-ascorbic acid (LA) on growth, feed utilization, survival, serum biochemical indices, immunity, antioxidant capacity, and intestinal and hepatopancreatic histology of the pre-adult red swamp crayfish. Four isoproteinous and isolipidic diets were formulated to contain several LA levels as 0, 1300, 1600, and 1900 mg/kg and designated as control (LA0), LA13, LA16, and LA19, respectively. However, the analyzed LA concentrations in diets were 0.00, 199.57, 360.45, and 487.50 mg/kg in LA0, LA13, LA16, and LA19, respectively. Triplicate treatments of crayfish (21.60 ± 0.14 g) were fed the test diets and reared in fiberglass tanks with a density of 20 individuals per each for eight weeks. Results revealed that all LA treatments had significantly enhanced growth performance compared to the control. Of interest, the LA16 treatment recorded the highest final tank biomass, biomass gain, total feed intake, condition factor, and muscle yield among the other treatments. The tank feed conversion ratio was significantly decreased in LA treatments compared to the control. Moreover, dietary LA16 and LA19 had significantly higher survival rates (93.3%) compared to (85.0%) in the LA0 group. All dietary doses of LA significantly increased serum parameters (total protein, albumin, globulin, lysozyme activity) and respiratory burst activity compared to the LA0 treatment. Dietary LA16 significantly boosted the hepatopancreatic antioxidant capacity, manifested by decreased malondialdehyde concentrations, increased catalase, superoxide dismutase, and glutathione peroxidase enzyme activities, and reduced glutathione content compared to the LA-free diet. A normal histoarchitecture of the hepatopancreatic tubules was found in all LA treatments except with some minor degenerative changes in the tubular lumen, and hepatopancreatic cells associated with enlarged nuclei were found in the LA19. However, normal intestinal histoarchitecture was found in all treatments with no recorded intestinal lesions. Of interest, the polynomial regression performed on the analyzed LA concentrations suggested that 380 mg/kg would be suitable to provide maximal biomass gain for pre-adult crayfish. In conclusion, results revealed that coated LA could enhance the growth, immunity, and antioxidant capacity of pre-adult red swamp crayfish, suggesting its potential as a functional and necessary micronutrient for crayfish diets.
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Affiliation(s)
- Hala S Khalil
- Aquaculture Department, Faculty of Fish Resources, Suez University, Suez, 43221, Egypt.
- College of Fisheries and Aquaculture Technology, Arab Academy for Science, Technology, and Maritime Transport, Alexandria, Egypt.
| | - Hamdy Omar Ahmed
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Nehal Elkhouly
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Mohammed F El Basuini
- Animal Production Department, Faculty of Agriculture, Tanta University, Tanta, 31527, Egypt
- Faculty of Desert Agriculture, King Salman International University, El Tor, South Sinai, 46618, Egypt
| | - Asmaa M El-Nokrashy
- Department of Aquaculture, Faculty of Aquatic and Fisheries Science, Kafrelsheikh University, Kafr Elsheikh, Egypt
| | - Amira A A Hessein
- Department of Fish Nutrition and Feed Technology, Central Laboratory for Aquaculture Research, Agriculture Research Centre (ARC), Abbassa, Abu Hammad, Sharkia, Egypt
| | - Asmaa A Khaled
- Animal and Fish Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria, 21531, Egypt
| | - Amr M A Rashad
- Animal and Fish Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, 21545, Egypt
| | - Mohamed Kord
- Central Laboratory for Agricultural Climate, Agriculture Research Center (ARC), Giza, Egypt
| | - Diaa Alkenawy
- Limnology Department, Central Laboratory for Aquaculture Research (CLAR), Agriculture Research Center (ARC), Abbassa, Abo-Hammad, Sharqia, Egypt
| | - Mohsen Abdel-Tawwab
- Department of Fish Biology and Ecology, Central Laboratory for Aquaculture Research, Agriculture Research Center (ARC), Abbassa, Abo-Hammad, Sharqia, Egypt
| | - Hany M R Abdel-Latif
- Department of Poultry and Fish Diseases, Faculty of Veterinary Medicine, Alexandria University, Alexandria, 22758, Egypt.
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Eissa ESH, Bazina WK, Abd El-Aziz YM, Abd Elghany NA, Tawfik WA, Mossa MI, Abd El Megeed OH, Abd El-Hamed NNB, El-Saeed AF, El-Haroun E, Davies SJ, Hasimuna OJ, Eissa MEH, Khalil HS. Nano-selenium impacts on growth performance, digestive enzymes, antioxidant, immune resistance and histopathological scores of Nile tilapia, Oreochromis niloticus against Aspergillus flavus infection. AQUACULTURE INTERNATIONAL 2023. [DOI: 10.1007/s10499-023-01230-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 07/28/2023] [Indexed: 09/01/2023]
Abstract
AbstractThe present study examined the impacts of varying amounts of selenium nanoparticles (Se-NPs) as a natural antioxidant and metabolic regulator on growth performance, antioxidant capacity, digestive enzymes and immune resistance of Oreochromis niloticus challenged to Aspergillus flavus infection. For 60 days, fish were fed the experimental diet of 30% crude protein up to apparent satiation three times a day. Se-NPs were added to the control diet at different levels of 0.0 (control), 0.5 (T1), 1.0 (T2) and 1.5 (T3) mg/kg diet to fed monosex Nile tilapia fingerlings with average initial weight (4.5 ± 0.5 g). Fish were randomly distributed in 12 tanks 100 L at a density of 20 fish per tank after 2-week acclimation to represent four treatments in triplicates. The results indicated that the growth indices, feed efficiency and survival rate were significantly enhanced (P < 0.05) by incorporating Se-NPs up to 1 mg/kg diet. Furthermore, the haemato-biochemical parameters, digestive enzymes activity and antioxidant capacity of the fish were significantly improved (P < 0.05) at T2. When the fish were challenged with Aspergillus flavus, a decreasing mortality rate was observed, which clearly shows that selenium nanoparticles boosted the fish’s immune response at T2. The intestinal morphology as villus length, villus width, muscular fibres layer thickness and absorption intestinal zone after challenged with A. flavus infection were considerably enhanced (P < 0.05) by incorporating all Se-NP levels. Histopathological score significantly improved (P < 0.05) for the hepatopancreatic, intestinal, gills and muscle tissues at T2. The present study concludes that selenium nanoparticles up to 1.0 mg/kg diet can be efficiently used in tilapia feed to help boost fish production, immune system response and histopathological parameters.
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Li G, Wang X, Liu Y, Gong S, Yang Y, Wang C, Wang H, He D. Bile acids supplementation modulates lipid metabolism, intestinal function, and cecal microbiota in geese. Front Microbiol 2023; 14:1185218. [PMID: 37303790 PMCID: PMC10250614 DOI: 10.3389/fmicb.2023.1185218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 05/15/2023] [Indexed: 06/13/2023] Open
Abstract
Bile acids(BAs) are important components of bile and play a significant role in fat metabolism. However, there is currently no systematic evaluation of the use of BAs as feed additives for geese.This study aimed to investigate the effects of adding BAs to goose feed on growth performance, lipid metabolism, intestinal morphology, mucosal barrier function, and cecal microbiota. A total of 168 28-day-old geese were randomly assigned to four treatment groups and fed diets supplemented with 0, 75, 150, or 300 mg/kg of BAs for 28 days. The addition of 75 and 150 mg/kg of BAs significantly improved the feed/gain (F/G) (p < 0.05).The addition of BAs decreased abdominal fat percentage and serum total cholesterol (TC) levels, with 150 mg/kg of BAs significantly reducing serum triglyceride levels and increased expression of Farnesoid X Receptor (FXR) mRNA in the liver(p < 0.05), 300 mg/kg of BAs significantly increasing the expression level of liver peroxisome proliferator-activated receptor α (PPARα) (p < 0.05). In terms of intestinal morphology and mucosal barrier function, 150 mg/kg of BAs significantly increased villus height (VH) and VH/crypt depth (CD) in the jejunum (p < 0.05). The addition of 150 and 300 mg/kg of BAs significantly reduced the CD in the ileum, while increasing VH and VH/CD (p<0.05). Additionally, the addition of 150 and 300 mg/kg of BAs significantly increased the expression levels of zonula occludens-1 (ZO-1) and occludin in the jejunum. Simultaneously 150mg/kg and 300mg/kg BAs increased the total short-chain fatty acids (SCFA) concentrations in the jejunum and cecum(p < 0.05).Supplementation with BAs resulted in a significant increase in the ɑ-diversity of cecal microbiota and a decrease in the abundance of Proteobacteria in the cecum. The addition of 150 mg/kg of BAs significantly reduced the abundance of Bacteroidetes and increased the abundance of Firmicutes. Moreover,Linear discriminant analysis Effect Size analysis (LEfSe) showed that the abundances of bacteria producing SCFA and bile salt hydrolases (BSH) were increased in the BAs-treated group. Furthermore, Spearman's analysis showed that the genus Balutia, which is negatively correlated with visceral fat area, was positively correlated with serum high-density lipoprotein cholesterol (HDL-C), while Clostridium was positively correlated with intestinal VH and VH/CD. In conclusion, BAs can be considered an effective feed additive for geese, as they increased SCFA concentration, improve lipid metabolism and intestinal health by enhancing the intestinal mucosal barrier, improving intestinal morphology, and altering the cecal microbiota structure.
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