Feed conversion ratio

Feed conversion ratio

In animal husbandry, feed conversion ratio (FCR), feed conversion rate, or feed conversion efficiency (FCE), is a measure of an animal's efficiency in converting feed mass into increased body mass.

Specifically FCR is the mass of the food eaten divided by the body mass gain, all over a specified period of time. FCR is dimensionless, "i.e." there are no measurement units associated with FCR. Animals that have a low FCR are considered efficient users of feed. Sheep and cattle need more than 8 kg of feed to put on 1 kg of live weight. The U.S. pork industry claims to have an FCR of 3.4-3.6 [ [http://www.pork.org/newsandinformation/quickfacts/porkstory2.aspx Pork Checkoff - Quick Facts - Pork Story ] ] . Farm raised Atlantic salmon apparently have a very good FCR, about 1.2.

Tilapia, typically, 1.6 to 1.8ftp://ftp.fao.org/docrep/fao/010/a0701e/a0701e.pdf] .
Poultry has a feed conversion ratio of 2 to 4.Ruminants can convert 7 kg of grain to one kilogram of meat.

Nonetheless this value is an underestimation of the FCR, for it does not take in account that more than often the feed is in kg of “dry” weight and the live weight is in kg of “wet” weight. When both factors are transformed to either dry or wet weight the FCR increases to between 4 and 5, depending on the feeding practice. Presently, technological advances in feed research are enabling salmon farmers to lower the “true” FCR to 4 and under (i.e. by substituting fish meal and fish oil with plant products such as soy and derivatives) which in consequence lowers the Salmon’s average trophic levelfact|date=October 2008.

It is important to understand that the above discussion of dry weight vs. wet weight for FCRs in Salmon also applies to other animals, such as poultry, cattle, and beef. Those FCR's are also a conversion of dry feed to wet animal weight, so really the FCRs are still to the same proportionsfact|date=October 2008.

References

Reflist|1 [Brown, L., Hindmarsh, R., Mcgregor, R., 2001. Dynamic Agriculture Book Three (2nd ed.). McGraw-Hill Book Company, Sydney.]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Standing wave ratio — In telecommunications, standing wave ratio (SWR) is the ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line. The SWR is usually defined as a …   Wikipedia

  • Mannan Oligosaccharide based nutritional supplements — Mannan oligosaccharide based nutritional supplements, MOS are widely used in nutrition as a natural additive. MOS has been shown to improve gastrointestinal health as well as overall health, thus improving wellbeing, energy levels and… …   Wikipedia

  • Food web — A freshwater aquatic and terrestrial food web. A food web (or food cycle) depicts feeding connections (what eats what) in an ecological community. Ecologists can broadly lump all life forms into one of two categories called trophic levels: 1) the …   Wikipedia

  • Hydrothermal vent — Marine habitats White smokers emitting liquid carbon dioxide at the Champagne vent, Northwest Eifuku volcano, Marianas Trench Marine National Monument Littoral zone …   Wikipedia

  • Cold seep — Marine habitats Tube worms are among the dominant species in one of four cold seep community types in the Gulf of Mexico. Littoral zone …   Wikipedia

  • Carnivore — Carnivorism redirects here. For the diet, see No carbohydrate diet. For other uses, see Carnivore (disambiguation). Lions are voracious carnivores; they require up to seven kilograms (15 lbs) of meat per day. A major component of their diet is… …   Wikipedia

  • Predation — For alternative meanings of predator and prey, see Predator (disambiguation) and Prey (disambiguation). Predating can also mean dating earlier than : see wiktionary:predate. Indian Python swallowing a small Chital deer at Mudumalai National Park …   Wikipedia

  • Trophic level — First trophic level The plants in this image, and the algae and phytoplankton in the lake, are primary producers. They take nutrients from the soil or the water, and manufacture their own food by photosynthesis, using energy from the sun. The… …   Wikipedia

  • Detritus — For other uses, see Detritus (disambiguation). In biology, detritus is non living particulate organic material (as opposed to dissolved organic material). It typically includes the bodies or fragments of dead organisms as well as fecal material.… …   Wikipedia

  • Decomposition — For other uses, see Decomposition (disambiguation). A mummified rat. Stages of death Pallor mortis Algor mortis …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”