Residual feed intake

Last updated

Residual feed intake (sometimes shortened in literature to RFI) is a resource allocation theory index[ clarification needed (what is a "resource allocation theory index"?)] used to calculate the feed efficiency of growing cattle. 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] This approach is based on regression models developed for determining efficiency of feed use for weight gain during a standardized growth trial in growing beef cattle. [3]

It was inspired by Koch's observations of the differences in how a maintained body weight and an increasing body weight affect the feeding of cattle. His research suggested that feed intake could be broken into two parts:

  1. The expected feed intake for the animal's level of production.
  2. The residual portion between the amount of feed the animal is expected to eat, and what the animal actually eats. [2]

Through the use of these two items, animals that deviate from the expected feed intake, either by eating more than or less than what's expected of them, can be identified and managed as the farmer sees fit. Because feed intake is heritable, knowing the RFI index of an animal is also useful when breeding. [2] By selecting animals with the aim to reduce RFI, farmers can breed animals that eat less but continue at the same rate of production. [1]

There is no phenotype link between RFI and the characteristics used to calculate expected feed intake, which allows for the comparison of animals who function at differing production numbers. This has led some authors to believe that RFI is representative of individual differences in the metabolic processes of the animals. For example, one study shows that the amount of feed a Hereford bull requires to maintain a kilogram of body weight is closely related to genetic variation in its RFI. Similarly, in laying hens, variation in RFI is directly linked to variations in maintenance energy expenditure. [2]

Related Research Articles

<span class="mw-page-title-main">Meat</span> Animal flesh eaten as food

Meat is animal flesh that is eaten as food. Humans have hunted, farmed, and scavenged animals for meat since prehistoric times. The establishment of settlements in the Neolithic Revolution allowed the domestication of animals such as chickens, sheep, rabbits, pigs, and cattle. This eventually led to their use in meat production on an industrial scale in slaughterhouses.

<span class="mw-page-title-main">Veal</span> Meat of young cattle

Veal is the meat of calves, in contrast to the beef from older cattle. Veal can be produced from a calf of either sex and any breed; however, most veal comes from young male calves of dairy breeds which are not used for breeding. Generally, veal is more expensive by weight than beef from older cattle. Veal production is a way to add value to dairy bull calves and to utilize whey solids, a byproduct from the manufacturing of cheese.

<span class="mw-page-title-main">Hay</span> Dried grass, legumes or other herbaceous plants used as animal fodder

Hay is grass, legumes, or other herbaceous plants that have been cut and dried to be stored for use as animal fodder, either for large grazing animals raised as livestock, such as cattle, horses, goats, and sheep, or for smaller domesticated animals such as rabbits and guinea pigs. Pigs can eat hay, but do not digest it as efficiently as herbivores do.

<span class="mw-page-title-main">Animal husbandry</span> Management, selective breeding, and care of farm animals by humans

Animal husbandry is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, or other products. It includes day-to-day care, selective breeding, and the raising of livestock. Husbandry has a long history, starting with the Neolithic Revolution when animals were first domesticated, from around 13,000 BC onwards, predating farming of the first crops. By the time of early civilisations such as ancient Egypt, cattle, sheep, goats, and pigs were being raised on farms.

<span class="mw-page-title-main">Dairy farming</span> Long-term production of milk

Dairy farming is a class of agriculture for long-term production of milk, which is processed for eventual sale of a dairy product. Dairy farming has a history that goes back to the early Neolithic era, around the seventh millennium BC, in many regions of Europe and Africa. Before the 20th century, milking was done by hand on small farms. Beginning in the early 20th century, milking was done in large scale dairy farms with innovations including rotary parlors, the milking pipeline, and automatic milking systems that were commercially developed in the early 1990s.

<span class="mw-page-title-main">Feedlot</span> An array of pens for feeding livestock for human consumption

A feedlot or feed yard is a type of animal feeding operation (AFO) which is used in intensive animal farming, notably beef cattle, but also swine, horses, sheep, turkeys, chickens or ducks, prior to slaughter. Large beef feedlots are called concentrated animal feeding operations (CAFO) in the United States and intensive livestock operations (ILOs) or confined feeding operations (CFO) in Canada. They may contain thousands of animals in an array of pens.

<span class="mw-page-title-main">Dairy cattle</span> Cattle bred to produce milk

Dairy cattle are cattle bred for the ability to produce large quantities of milk, from which dairy products are made. Dairy cattle generally are of the species Bos taurus.

<span class="mw-page-title-main">Cattle feeding</span> Consumption of feces

There are different systems of feeding cattle in animal husbandry. For pastured animals, grass is usually the forage that composes the majority of their diet. Cattle reared in feedlots are fed hay supplemented with grain, soy and other ingredients to increase the energy density of the feed. The debate is whether cattle should be raised on fodder primarily composed of grass or a concentrate. The issue is complicated by the political interests and confusion between labels such as "free range", "organic", or "natural". Cattle raised on a primarily foraged diet are termed grass-fed or pasture-raised; for example meat or milk may be called grass-fed beef or pasture-raised dairy. The term "pasture-raised" can lead to confusion with the term "free range", which does not describe exactly what the animals eat.

<span class="mw-page-title-main">Limousin cattle</span> French breed of cattle

The Limousin, French: Limousine, is a French breed of beef cattle from the Limousin and Marche regions of France. It was formerly used mainly as a draught animal, but in modern times is reared for beef. A herd-book was established in France in 1886. With the mechanisation of agriculture in the twentieth century, numbers declined. In the 1960s there were still more than 250 000 head, but the future of the breed was not clear; it was proposed that it be merged with the other blonde draught breeds of south-western France – the Blonde des Pyrénées, the Blonde de Quercy and the Garonnaise – to form the new Blonde d'Aquitaine. Instead, a breeders' association was formed; new importance was given to extensive management, to performance recording and to exports. In the twenty-first century the Limousin is the second-most numerous beef breed in France after the Charolais. It is a world breed, raised in about eighty countries round the world, many of which have breed associations.

<span class="mw-page-title-main">Pastoral farming</span> Method for producing livestock

Pastoral farming is aimed at producing livestock, rather than growing crops. Examples include dairy farming, raising beef cattle, and raising sheep for wool. In contrast, arable farming concentrates on crops rather than livestock. Finally, mixed farming incorporates livestock and crops on a single farm. Some mixed farmers grow crops purely as fodder for their livestock; some crop farmers grow fodder and sell it. In some cases pastoral farmers are known as graziers, and in some cases pastoralists. Pastoral farming is a non-nomadic form of pastoralism in which the livestock farmer has some form of ownership of the land used, giving the farmer more economic incentive to improve the land. Unlike other pastoral systems, pastoral farmers are sedentary and do not change locations in search of fresh resources. Rather, pastoral farmers adjust their pastures to fit the needs of their animals. Improvements include drainage, stock tanks, irrigation and sowing clover.

In animal husbandry, feed conversion ratio (FCR) or feed conversion rate is a ratio or rate measuring of the efficiency with which the bodies of livestock convert animal feed into the desired output. For dairy cows, for example, the output is milk, whereas in animals raised for meat the output is the flesh, that is, the body mass gained by the animal, represented either in the final mass of the animal or the mass of the dressed output. FCR is the mass of the input divided by the output. In some sectors, feed efficiency, which is the output divided by the input, is used. These concepts are also closely related to efficiency of conversion of ingested foods (ECI).

<span class="mw-page-title-main">Beef cattle</span> Breed of cattle

Beef cattle are cattle raised for meat production. The meat of mature or almost mature cattle is mostly known as beef. In beef production there are three main stages: cow-calf operations, backgrounding, and feedlot operations. The production cycle of the animals starts at cow-calf operations; this operation is designed specifically to breed cows for their offspring. From here the calves are backgrounded for a feedlot. Animals grown specifically for the feedlot are known as feeder cattle, the goal of these animals is fattening. Animals not grown for a feedlot are typically female and are commonly known as replacement heifers. While the principal use of beef cattle is meat production, other uses include leather, and beef by-products used in candy, shampoo, cosmetics, and insulin.

<span class="mw-page-title-main">Farm water</span>

Farm water, also known as agricultural water, is water committed for use in the production of food and fibre and collecting for further resources. In the US, some 80% of the fresh water withdrawn from rivers and groundwater is used to produce food and other agricultural products. Farm water may include water used in the irrigation of crops or the watering of livestock. Its study is called agricultural hydrology.

Ecological efficiency describes the efficiency with which energy is transferred from one trophic level to the next. It is determined by a combination of efficiencies relating to organismic resource acquisition and assimilation in an ecosystem.

The concept of an animal unit (AU) has traditionally been used in North America to facilitate planning, analysis and administration of forage use by grazing livestock, but the term has also had other applications. The term has been variously defined by regulation in different jurisdictions, and by livestock management specialists, rangeland resource managers and others. Consequently, when using or interpreting the term, care is needed to ensure that a definition appropriate for the purpose is being used. Most definitions are based on the concept that a 1000-pound (454 kg) cow, with or without an unweaned calf, is one animal unit, with such a cow being assumed to consume 26 pounds of forage dry matter per day.

<span class="mw-page-title-main">Feeder cattle</span> Young cattle soon to be sent to fattening, especially those intended for sale before finishing

Feeder cattle, in some countries or regions called store cattle, are young cattle mature enough either to undergo backgrounding or to be fattened in preparation for slaughter. They may be steers or heifers. The term often implicitly reflects an intent to sell to other owners for fattening (finishing). Backgrounding occurs at backgrounding operations, and fattening occurs at a feedlot. Feeder calves are less than 1 year old; feeder yearlings are between 1 and 2 years old. Both types are often produced in a cow-calf operation. After attaining a desirable weight, feeder cattle become finished cattle that are sold to a packer. Packers slaughter the cattle and sell the meat in carcass boxed form.

<span class="mw-page-title-main">Insect farming</span> Raising and breeding insects as livestock

Insect farming is the practice of raising and breeding insects as livestock, also referred to as minilivestock or micro stock. Insects may be farmed for the commodities they produce, or for them themselves; to be used as food, as feed, as a dye, and otherwise.

Precision livestock farming (PLF) is a set of electronic tools and methods for managing livestock. It involves automated monitoring of animals to improve their production/reproduction, health, welfare, and impact on the environment. PLF tracks large animals, such as cows, "per animal"; however, it tracks smaller animals, such as poultry, "per flock", wherein the whole flock in a house is treated as one animal. Tracking "per flock" is widely used in broilers.

<span class="mw-page-title-main">Feed manufacturing</span>

Feed manufacturing refers to the process of producing animal feed from raw agricultural products. Fodder produced by manufacturing is formulated to meet specific animal nutrition requirements for different species of animals at different life stages. According to the American Feed Industry Association (AFIA), there are four basic steps:

  1. Receive raw ingredients: Feed mills receive raw ingredients from suppliers. Upon arrival, the ingredients are weighed, tested and analyzed for various nutrients and to ensure their quality and safety.
  2. Create a formula: Nutritionists work side by side with scientists to formulate nutritionally sound and balanced diets for livestock, poultry, aquaculture and pets. This is a complex process, as every species has different nutritional requirements.
  3. Mix ingredients: Once the formula is determined, the mill mixes the ingredients to create a finished product.
  4. Package and label: Manufacturers determine the best way to ship the product. If it is prepared for retail, it will be "bagged and tagged," or placed into a bag with a label that includes the product's purpose, ingredients and instructions. If the product is prepared for commercial use, it will be shipped in bulk.

A pasture wedge graph or feed wedge is a farm management tool used by dairy farmers for the purposes of managing pasture. It takes the form of a bar graph, that shows the amount of feed available in a pasture over time, and is therefore shaped as a declining wedge.

References

  1. 1 2 Sainz, Roberto D.; & Paulino, Pedro V.(2004). Residual Feed Intake. UC Davis: Sierra Foothill Research and Extension Center
  2. 1 2 3 4 R.M. Herd (2009). "Residual Feed Intake". In Wendy M. Rauw (ed.). Resource Allocation Theory Applied to Farm Animal Production. CABI. pp. 89–109. ISBN   978-1-84593-436-1 . Retrieved 10 July 2013.
  3. Connor, E. E. (2015-03-01). "Invited review: Improving feed efficiency in dairy production: challenges and possibilities*". Animal. 9 (3): 395–408. doi: 10.1017/S1751731114002997 . ISSN   1751-7311. PMID   25482927.