doktorska disertacija
Jakob Leskovec (Author), Alenka Levart (Mentor), Dejan Škorjanc (Thesis defence commission member), Janez Salobir (Co-mentor)

Abstract

V delu smo preučevali vpliv vitamina E in s polifenoli bogatih ekstraktov oljk in ognjiča v prehrani pitovnih piščancev ter rastočih prašičev na oksidativni stres, povzročen z visokim vnosom n-3 VNMK. Nalogo smo razdelili na tri sklope ter preučevali: sinergistično delovanje vitamina E z vitaminom C ter selenom pri pitovnih piščancih, učinek ekstrakta oljčnih listov, bogatega s polifenoli oljk, v primerjavi z vitaminom E pri rastočih prašičih, ter vpliv dodatkov ekstrakta oljčnih listov in ognjiča na navidezno prebavljivost hranil in mineralizacijo kosti pri pitovnih piščancih. V omenjenih raziskavah smo ugotovili, da je vitamin E najučinkovitejši antioksidant za preprečevanje oksidativnega stresa, povzročenega s prehranskim vnosom n-3 VNMK, in da vitamin C in selen nimata sinergističnega delovanja z vitaminom E. Enako smo pokazali pri rastočih prašičih, kjer je vitamin E izkazal učinkovitejšo obrambo v primerjavi z ekstraktom oljčnih listov, učinek dodatka ekstrakta pa ni bil koncentracijsko odvisen. V tretjem delu naloge smo ugotovili, da ekstrakt oljčnih listov in ognjiča ne vpliva na izkoriščanje hranil pri pitovnih piščancih, prav tako pa ni imel vpliva na mineralizacijo kosti. Iz izsledkov opravljenih raziskav lahko zaključimo, da je najučinkovitejši antioksidant za zaščito proučevanih živali pred oksidativnim stresom vitamin E ter da njegova zamenjava npr. z ekstraktom oljčnih listov ni mogoča, čeprav na živali nima neugodnih učinkov.

Keywords

prehrana živali;oksidativni stres;antioksidanti;vitamin E;polifenoli;oljke;ognjič;perutnina;pitovni piščanci;rastoči prašiči;disertacije;

Data

Language: Slovenian
Year of publishing:
Typology: 2.08 - Doctoral Dissertation
Organization: UL BF - Biotechnical Faculty
Publisher: [J. Leskovec]
UDC: 636.084/.087:636.4:636.5(043.3)
COBISS: 4320136 Link will open in a new window
Views: 1056
Downloads: 359
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Other data

Secondary language: English
Secondary title: ǂThe ǂeffects of dietary vitamin E and olive polyphenols in broilers and growing pigs
Secondary abstract: The objective of the study was to evaluate the influence of dietary vitamin E and olive polyphenols on the oxidative stress caused by a high intake of n-3 PUFA in broiler chickens and growing pigs. Research was divided into three sections: the synergistic effect of vitamin E with vitamin C and Se on broilers, the effect of olive leaf extract rich in olive polyphenols versus vitamin E in growing pigs, and the influence of olive leaf and marigold extract on the apparent digestibility of nutrients in broilers. In these studies, vitamin E was the most effective antioxidant for the prevention of oxidative stress caused by the dietary intake of n-3 PUFA, and vitamin C and Se did not have a synergistic effect with vitamin E in chickens. Similar results were obtained in growing pigs, in which vitamin E was a more effective defence than the olive leaf extract, and the effect of the extract was not concentration-dependent. In the third part of the thesis, we observed that the olive leaf extract did not affect the utilization of nutrients in broiler chickens, nor did it affect the mineralization of bones. From the results of the research we concluded that the most effective antioxidant to protect animals against oxidative stress is vitamin E, and that it is still premature to replace it with the olive leaf extract, although extract does not negatively affect the animals.
Secondary keywords: animal nutrition;oxidative stress;antioxidants;vitamin E;polyphenols;olives;marigold;poultry;broilers;growing pigs;
Type (COBISS): Doctoral dissertation
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Biotehniška fak.
Pages: X, 104 f.
ID: 11270661