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Calculation method
Not as accurate as approximate analysis
Proximate analysis uses nitrogen, free extract ( represents carbs )
Digestibility
Feeding trials are the most accurate
Represented as digestible energy or metabolize energy
DE
Measures energy and food absorbed across the intestinal wall
ME
Measures energy and food observed across the intestinal wall minus the amount loss in feces and urine
Nutrient density
Expressed as Graeme/100 kcal of ME for each nutrient
Not calculated based off gross energy
Extrusion process
Dry food disadvantage
EFAs ( linoleic and arachidonic )
Can be affected by prolong storage
What temperature do cats prefer moist food?
100°F
Canning process
Nutrient loss
Lower nutrient density due to water
Semi moist
Preserved with humectants
Hi sugar content