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Type of publication: Diploma Thesis
Type of document:

Year: 2011

Authors: Müller, Maximiliane

Title: Bestimmung der umsetzbaren Energie im Katzenfutter.

Other title: Comparison of analytically determined values with estimated energy values of cat's food

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 32.


Iben Christine

Zentek Jürgen

Vetmed Research Units:
Institute of Animal Nutrition and Functional Plant Compounds

Graduation date: 22.03.11

Energy in food for cats is valuated on the basis of metabolizable energy. To predict the energy content, some estimation formulas exist. Aim of this stud y was to compare these formulas with trial based results. Nine metabolic trials with 8 cats each were conducted. After 7 days prefeeding period a 7 days collection period followed, where total faeces as well as total urine were collected. Gross energy was anal yzed from the food and faeces samples. The urine of cats was slowl y dried b y adding a special amount every day until enough dry substance was available to determine the energy using a bomb calorimeter. Digestibilit y and metabolizabilit y of energy of wet food was significantl y higher compared with dry food. Deviations between calculated (NRC, 2006) and the trial based results of ME were between -10.3 and 18.7 %, the correlation between both was 0.707 (Pearson). Digestibilit y and metabolizabilit y were significantl y correlated with the fat content and negativel y with the fibre content. Mean loss of energy by urine was significantl y higher when dry food was given compared with wet food. The content of crude protein in the diet was onl y weakl y correlated with the loss of urine energy per g protein. The mean urine loss determined in these trials was lower than that calculated with the equation, nevertheless, the value of 3.1 kJ/g protein prevents overestimation of energy in food. Digestibilit y of fibre seems to be an unknown factor, whereas fat seems to have an essential influence on digestibility.

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