Abstract
Selected quality and oxidative stability parameters of the lipid fraction were analyzed in four complete dry dog foods with different main animal-derived ingredients. The measurements were taken at the time of bag opening and repeated after 7 months of continuous storage in normal room conditions. Fatty acid (FA) content and acid value (AV) were determined, followed by subsequent pressure differential scanning calorimetry (PDSC) measurements. From the resulting PDSC exotherms, maximum induction time (τ max) was determined and used for assessing the oxidative stability. The study revealed changes in lipid quality and oxidative stability of dry dog foods that appeared during storage. Results of FA and AV assays showed specificity and marked quality differences of lipid ingredients declared as used in the production process. Product with the lowest content of polyunsaturated FA had the highest oxidative stability. PDSC appeared to be an effective method for the analysis of lipid oxidation in pet foods.
Highlights
As reported by the European Pet Food Industry Federation (FEDIAF), 8.5 million tons of pet food products was sold in EU in 2012 with a turnover of 13.8 billion euro [1].Continuing growth in pet-related spending is currently explained with the increased devotion to pets [2]
pressure differential scanning calorimetry (PDSC) appeared to be an effective method for the analysis of lipid oxidation in pet foods
It can be expected that changes observed in lipid properties after storage mainly resulted from alterations in coatings and palatants sprayed over dried kibbles
Summary
As reported by the European Pet Food Industry Federation (FEDIAF), 8.5 million tons of pet food products was sold in EU in 2012 with a turnover of 13.8 billion euro [1].Continuing growth in pet-related spending is currently explained with the increased devotion to pets [2]. As reported by the European Pet Food Industry Federation (FEDIAF), 8.5 million tons of pet food products was sold in EU in 2012 with a turnover of 13.8 billion euro [1]. Before making purchase decisions on the market, dog owners seek the best feeding option for their pets, often consulting the packaging information [3]. Pet food labels are widely promoted as the primary source of information for customers [4]. According to EU regulations that concern products for animal feeding all nutrient sources used in the production process have to be listed on the label either by specific names or categories [5]. Regulatory guidelines forbid the inclusion of ingredient quality indicators on pet food labels. Actual properties of finished product depend on selection of commodities providing the nutritional features [6]
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