The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar)
The increased use of plant-based ingredients in aquafeeds for Atlantic salmon has led to an increase in phytate, an antinutrient binding micro minerals and reducing their bioavailability. It has been suggested that the chemical form of the minerals (organic/inorganic) can alter their bioavailability...
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The University of Bergen
2018
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ftunivbergen:oai:bora.uib.no:1956/18101 2023-05-15T15:26:17+02:00 The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) Hundal, Bjørg Kristine 2018-06-26T22:00:10Z application/pdf https://hdl.handle.net/1956/18101 eng eng The University of Bergen https://hdl.handle.net/1956/18101 Copyright the Author. All rights reserved Atlanterhavslaks Oppdrettslaks Forstoffer Mikronæringsstoffer Biotilgjengelighet https://data.ub.uio.no/realfagstermer/c012698 https://data.ub.uio.no/realfagstermer/c013315 https://data.ub.uio.no/realfagstermer/c003322 https://data.ub.uio.no/realfagstermer/c013922 https://data.ub.uio.no/realfagstermer/c012751 751999 Master thesis 2018 ftunivbergen 2023-03-14T17:42:31Z The increased use of plant-based ingredients in aquafeeds for Atlantic salmon has led to an increase in phytate, an antinutrient binding micro minerals and reducing their bioavailability. It has been suggested that the chemical form of the minerals (organic/inorganic) can alter their bioavailability, especially in feeds with high phytate content. The functional role of minerals in hepatic intermediary metabolism is poorly understood in fish, though studies have shown that dietary mineral levels can affect hepatic lipid metabolism. However, this effect has not been examined in the nutritionally relevant context of dietary mineral availability in plant ingredient based diets. The aim of this study was to investigate whether availability and chemical form of zinc, selenium and manganese affected liver lipid metabolism of Atlantic salmon. A feeding trial involving five different diets was performed. The two control diets contained inorganic Zn, Se and Mn with different phytate contents. Unfortunately, the difference in phytate turned out to be too small to have any effect on the mineral digestibility. The three other diets all had the higher phytate content and in each diet one of the inorganic minerals Zn, Se and Mn were exchanged with chelate of Zn, selenium methionine or chelate of Mn, respectively. The mineral content of the liver was investigated to see if there had been any changes to the mineral status. No significant differences were found. Genes involved in β-oxidation (PPARα, CPT1), lipogenesis (LXR, SREBP1, FAS), bioconversion into LC-PUFA (Δ5Fad, Δ6Fad) and transport out of the liver (ApoB100) were examined to see if there were any effects on hepatic lipid metabolism. There were no significant effects on LXR, FAS, PPARα, CPT1, Δ5Fad or Δ6Fad. ApoB100 and SREBP1 were significantly reduced in the higher phytate control group compared to the lower phytate control. However, these two groups had the same chemical form of all the minerals, no impact of phytate on mineral digestibility was detected and there ... Master Thesis Atlanterhavslaks Atlantic salmon Salmo salar University of Bergen: Bergen Open Research Archive (BORA-UiB) |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Atlanterhavslaks Oppdrettslaks Forstoffer Mikronæringsstoffer Biotilgjengelighet https://data.ub.uio.no/realfagstermer/c012698 https://data.ub.uio.no/realfagstermer/c013315 https://data.ub.uio.no/realfagstermer/c003322 https://data.ub.uio.no/realfagstermer/c013922 https://data.ub.uio.no/realfagstermer/c012751 751999 |
spellingShingle |
Atlanterhavslaks Oppdrettslaks Forstoffer Mikronæringsstoffer Biotilgjengelighet https://data.ub.uio.no/realfagstermer/c012698 https://data.ub.uio.no/realfagstermer/c013315 https://data.ub.uio.no/realfagstermer/c003322 https://data.ub.uio.no/realfagstermer/c013922 https://data.ub.uio.no/realfagstermer/c012751 751999 Hundal, Bjørg Kristine The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) |
topic_facet |
Atlanterhavslaks Oppdrettslaks Forstoffer Mikronæringsstoffer Biotilgjengelighet https://data.ub.uio.no/realfagstermer/c012698 https://data.ub.uio.no/realfagstermer/c013315 https://data.ub.uio.no/realfagstermer/c003322 https://data.ub.uio.no/realfagstermer/c013922 https://data.ub.uio.no/realfagstermer/c012751 751999 |
description |
The increased use of plant-based ingredients in aquafeeds for Atlantic salmon has led to an increase in phytate, an antinutrient binding micro minerals and reducing their bioavailability. It has been suggested that the chemical form of the minerals (organic/inorganic) can alter their bioavailability, especially in feeds with high phytate content. The functional role of minerals in hepatic intermediary metabolism is poorly understood in fish, though studies have shown that dietary mineral levels can affect hepatic lipid metabolism. However, this effect has not been examined in the nutritionally relevant context of dietary mineral availability in plant ingredient based diets. The aim of this study was to investigate whether availability and chemical form of zinc, selenium and manganese affected liver lipid metabolism of Atlantic salmon. A feeding trial involving five different diets was performed. The two control diets contained inorganic Zn, Se and Mn with different phytate contents. Unfortunately, the difference in phytate turned out to be too small to have any effect on the mineral digestibility. The three other diets all had the higher phytate content and in each diet one of the inorganic minerals Zn, Se and Mn were exchanged with chelate of Zn, selenium methionine or chelate of Mn, respectively. The mineral content of the liver was investigated to see if there had been any changes to the mineral status. No significant differences were found. Genes involved in β-oxidation (PPARα, CPT1), lipogenesis (LXR, SREBP1, FAS), bioconversion into LC-PUFA (Δ5Fad, Δ6Fad) and transport out of the liver (ApoB100) were examined to see if there were any effects on hepatic lipid metabolism. There were no significant effects on LXR, FAS, PPARα, CPT1, Δ5Fad or Δ6Fad. ApoB100 and SREBP1 were significantly reduced in the higher phytate control group compared to the lower phytate control. However, these two groups had the same chemical form of all the minerals, no impact of phytate on mineral digestibility was detected and there ... |
format |
Master Thesis |
author |
Hundal, Bjørg Kristine |
author_facet |
Hundal, Bjørg Kristine |
author_sort |
Hundal, Bjørg Kristine |
title |
The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) |
title_short |
The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) |
title_full |
The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) |
title_fullStr |
The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) |
title_full_unstemmed |
The impact of micro-mineral sources and their availability on hepatic lipid metabolism in Atlantic salmon (Salmo salar) |
title_sort |
impact of micro-mineral sources and their availability on hepatic lipid metabolism in atlantic salmon (salmo salar) |
publisher |
The University of Bergen |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/18101 |
genre |
Atlanterhavslaks Atlantic salmon Salmo salar |
genre_facet |
Atlanterhavslaks Atlantic salmon Salmo salar |
op_relation |
https://hdl.handle.net/1956/18101 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766356798919409664 |