Hi!

I would like to calculate the FCR for a diet-induced obesity experiment in rats. Since I have many nutrients/groups, I am calculating the food intake (FI) in kcal, not in grams of food. Has anybody ever calculated the FCR in kcal or knows a valid formula for it? I am not sure whether estimating the FCR as kcal/g of weight gain would be correct, since both the FI and the weight gain need to be in similar units. Some of the works I have been reading are not discerning between foods, and estimate the FCR as FI (g) / weight gain (g).

Many thanks in advance!

Fiona

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