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The regular feed conversion ratio, i.e. output fish mass divided by total feed mass. The conversion ratio only taking into account the fish-based component of fish feed, called the FIFO ratio (or Fish In – Fish Out ratio). FIFO is fish in (the mass of harvested fish used to feed farmed fish) divided by fish out (mass of the resulting farmed ...
It was developed by Robert M. Koch in 1963 as an answer to the difficulties of using a feed conversion ratio to compare individual animals. [1] Effective use of RFI data can greatly improve beef cattle farm profits. [2]
The efficiency of conversion of ingested food to unit of body substance (ECI, also termed "growth efficiency") is an index measure of food fuel efficiency in animals. [1] The ECI is a rough scale of how much of the food ingested is converted into growth in the animal's mass. It can be used to compare the growth efficiency as measured by the ...
Thus, the weight of bones and skin etc. would not go into the equation, neither would fodder not consumable by humans (grass) enter the equation. The desire for a "primary" conversion ratio relates to the case, where the fodder itself has a feed conversion ratio (raising fish from plant matter to be fed to other fish).
A key measure of performance is the feed conversion ratio (FCR), the ability to convert feed into edible product. In 2018 the FCR of broilers is about 1.5, or 1.5 kg of feed to produce 1 kg of meat. [2] This compares very favorably with other sources of meat.
The rest of the energy input into cultivating feed is respired or egested by the livestock and unable to be used by humans. Out of a total of 28,400 terawatt-hours (96.8 × 10 ^ 15 BTU) of energy used in the US in 1999, 10.5% was used in food production, [3] with the percentage accounting for food from both producer and primary consumer trophic ...
Based on the work of Atwater, it became common practice to calculate energy content of foods using 4 kcal/g for carbohydrates and proteins and 9 kcal/g for lipids. [2] The system was later improved by Annabel Merrill and Bernice Watt of the USDA, who derived a system whereby specific calorie conversion factors for different foods were proposed. [3]
Thus, the weight of bones and skin etc. would not go into the equation, neither would fodder not consumable by humans (grass) enter the equation. The desire for a "primary" conversion ratio relates to the case, where the fodder itself has a feed conversion ratio (raising fish from plant matter to be fed to other fish).