For thousands of years, humans have used selective breeding to improve production of crops and livestock to use them for food.

For governance ease, the Spaniards developed a complicated breeding calculus to classify people into twenty-one castas, or genizaros.

For field breeding, a female is turned out into a field with a male llama and left there for some period of time.

For instance, in the wake of well-publicised health concerns associated with saturated fats in the 1980s, the fat content of UK beef, pork and lamb fell from 20 – 26 percent to 4 – 8 percent within a few decades, both due to selective breeding for leanness and changed methods of butchery.

For each new solution to be produced, a pair of " parent " solutions is selected for breeding from the pool selected previously.

For example, extensive shellfish aquaculture takes up valuable space used by coastal marine mammals for important activities such as breeding, foraging and resting.

For example, many seabirds and sea turtles only gather at breeding sites or colonies at night to reduce the risk of predation to themselves and / or their offspring.

For these crops there has been considerable research and selective breeding carried out in order to find cultivars that are resistant or immune to pest and disease damage.

For such a predatory bird, the indiscriminate use of pesticides ( which will accumulate in adult carnivores and inhibit breeding success ) around the 1960s probably had a detrimental influence on stocks too.

For example, the Asian Koels breeding in India have black offspring to resemble their crow hosts, whereas in the Australian Koels the chicks are brown like the honeyeater hosts.

For example, establishment of colonies at the Fowlsheugh Reserve in Scotland was one of the first areas to be developed for new permanent Fulmar breeding areas.

For two species, the recently rediscovered New Zealand Storm Petrel and the Ringed Storm Petrel, even the sites of their breeding colonies remain a mystery.

For example, the breeding population of feral pigeons in Sheffield, England, has been estimated at only 12, 130 individuals.

For example, the breeding population in the city of Sheffield ( a city of half a million people ) has been estimated at 17, 164 individuals.

For example: it is during breeding season that they give off the musky odour from which the species derives its common name.

For example, in Britain, where inland breeding was once uncommon, there are now increasing numbers of birds breeding inland, and many inland fish farms and fisheries now claim to be suffering high losses due to these birds.

For example, in the 19th century it disappeared as a breeding bird in Poland and only occurs there as a migrant nowadays ; its breeding population in Central Europe apparently was a relict of the last ice age ( Tomek & Bocheński, 2005 ).

For information on breeding behavior of soras, see.

For his commitment to captive breeding the Madagascar angulated tortoise ( Geochelone yniphora ), McKeown received the AAZPA conservation award.

For owls found in more tropical climates, the dates of the breeding season are somewhat undefined.

For large herbivores, a sufficient predator population would also be necessary to support such a process, but this largely is not present in current Europe, where many breeding back projects are conducted.

For example there is a large breeding colony near Cape Cod, Massachusetts, where pups rebounded from a handful in 1980 to more than 2, 000 in 2008.

For one thing, in particular the young devour many pest insects during the breeding season.

For Arthur Schopenhauer aesthetic contemplation of beauty is the most free that the pure intellect can be from the dictates of will ; here we contemplate perfection of form without any kind of worldly agenda, and thus any intrusion of utility or politics would ruin the point of the beauty.

For pure chemical elements, polymorphism is known as allotropy.

" For example, James Madison argued for a constitutional republic with protections for individual liberty over a pure democracy, reasoning that, in a pure democracy, a " common passion or interest will, in almost every case, be felt by a majority of the whole ... and there is nothing to check the inducements to sacrifice the weaker party ...."

For Derrida it is not possible to escape the dogmatic baggage of the language we use in order to perform a pure critique in the Kantian sense.

For Avicenna ( Ibn Sina ), for example, the a tabula rasa is a pure potentiality that is actualized through education, and knowledge is attained through " empirical familiarity with objects in this world from which one abstracts universal concepts " developed through a " syllogistic method of reasoning in which observations lead to propositional statements which when compounded lead to further abstract concepts.

For a system consisting of vapor and liquid of a pure substance, this equilibrium state is directly related to the vapor pressure of the substance, as given by the Clausius-Clapeyron relation:

For example, a product package might include a logo or other artwork, organized text and pure design elements such as shapes and color which unify the piece.

For example, beryl, which is colorless in its pure mineral form, becomes emerald with chromium impurities.

For example, Immanuel Kant used pure description to discuss recognition and its components and Sir Francis Bacon claimed that the simple observation of the rote recollection of a previously learned list was “ no use to the art ” of memory.

For example, oxygen makes up about < sup > 8 </ sup >/< sub > 9 </ sub > of the mass of any sample of pure water, while hydrogen makes up the remaining < sup > 1 </ sup >/< sub > 9 </ sub > of the mass.

For example, in a pure cash deal ( financed from the company ’ s current account ), liquidity ratios might decrease.

For example, some fungal melanins are pure polyacetylene.

For natural proteins, a series of purification steps may be necessary to obtain protein sufficiently pure for laboratory applications.

For pure chemical elements, polymorphism is known as allotropy.

For instance, it is commonly accepted now that the famous Gutenberg – Richter law decays more rapidly than a pure power-law tail because of a finite exponential cutoff in the upper tail.

For example the pure qubit state would lie on the equator of the sphere, on the positive y axis.

For example, the entropy of any pure state is zero, which is unsurprising since there is no uncertainty about a system in a pure state.

For bipartite pure states, the von Neumann entropy of reduced states is the unique measure of entanglement in the sense that it is the only function on the family of states that satisfies certain axioms required of an entanglement measure.

For pure Internet Protocol ( IP ) forwarding function, a router is designed to minimize the state information associated with individual packets.

For Marxists, the stage of economic development in which this is possible, sometimes called pure communism, is contingent upon advances in the productive capabilities of society.

For example, the pure semiconductor silicon has four valence electrons.

Also significant is the clear warning against paying heed to those who say that Jesus was not a flesh-and-blood figure: “ For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh .” This establishes that, from the time the epistle was first written, there were those who had docetic Christologies, believing that the human person of Jesus was actually pure spirit.

For pure rocket approaches Tsiolkovsky's rocket equation shows that dead weight will prevent reaching orbit unless the ratio of propellant to structural mass ( called mass ratio ) is very high — between about 10 and 25 ( i. e. 24 parts propellant weight to 1 part structural weight ; depending on propellant choice ).