Use of recovered frying oils in chicken and rabbit feeds: effect on the fatty acid and tocol composition and on the oxidation levels of meat, liver and plasma
| Autor: | R. Codony, Núria Magrinyà, Ricard Bou, C. D. Nuchi, Francesc Guardiola, Alba Tres |
|---|---|
| Přispěvatelé: | Universitat de Barcelona |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Thiobarbituric acid
medicine.medical_treatment Tocopherols Àcids grassos vitamin E Oxidació chemistry.chemical_compound Olis vegetals Clinical trials Fetge Alimentació animal Vitamin E Tocopherol Food science Cooking vegetable frying oils Animal Husbandry Conills media_common chemistry.chemical_classification Fatty Acids Animal culture Carn Liver oxidability Tocotrienol Rabbits Oxidation-Reduction Polyunsaturated fatty acid Oxidation-reduction reaction Meat Vitamina E Pollastres feed ingredients SF1-1100 Reacció d'oxidació-reducció Oxidation medicine media_common.cataloged_instance Animals Plant Oils European union Fatty acids Pinsos tissue lipid composition Animal feeding Fatty acid Animal Feed chemistry Feeds Animal Science and Zoology Vegetable oils alpha-Tocopherol Chickens Assaigs clínics |
| Zdroj: | Animal, Vol 7, Iss 3, Pp 505-517 (2013) Recercat. Dipósit de la Recerca de Catalunya instname Dipòsit Digital de la UB Universidad de Barcelona |
| ISSN: | 1751-7311 |
| Popis: | The addition of some fat co- and by-products to feeds is usual nowadays; however, the regulations of their use are not always clear and vary between countries. For instance, the use of recycled cooking oils is not allowed in the European Union, but they are used in other countries. However, oils recovered from industrial frying processes could show satisfactory quality for this purpose. Here we studied the effects of including oils recovered from the frying industry in rabbit and chicken feeds (at 30 and 60 g/kg, respectively) on the fatty acid (FA) and tocol (tocopherol + tocotrienol) compositon of meat, liver and plasma, and on their oxidative stability. Three dietary treatments (replicated eight times) were compared: fresh non-used oil (LOX); oil discarded from the frying industry, having a high content of secondary oxidation compounds (HOX); and an intermediate level (MOX) obtained by mixing 50 : 50 of LOX and HOX. The FA composition of oil diets and tissues was assessed by GC, their tocol content by HPLC, the thiobarbituric acid value was used to assess tissue oxidation status, and the ferrous oxidation-xylenol orange method was used to assess the susceptibility of tissues to oxidation. Our results indicate that FA composition of rabbit and chicken meat, liver and plasma was scarcely altered by the addition of recovered frying oils to feed. Differences were encountered in the FA composition between species, which might be attributed mainly to differences in the FA digestion, absorption and metabolism between species, and to some physiological dietary factors (i.e. coprophagy in rabbits that involves fermentation with FA structure modification). The α-tocopherol (αT) content of tissues was reduced in response to the lower αT content in the recovered frying oil. Differences in the content of other tocols were encountered between chickens and rabbits, which might be attributable to the different tocol composition of their feeds, as well as to species differences in the digestion and metabolism of tocols. Tissue oxidation and susceptibility to oxidation were in general low and were not greatly affected by the degree of oxidation of the oil added to the feeds. The relative content of polyunsaturated fatty acids/αT in these types of samples would explain the differences observed between species in the susceptibility of each tissue to oxidation. According to our results, oils recovered from the frying industry could be useful for feed uses. |
| Databáze: | OpenAIRE |
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