science

Jærhøns

Jærhøns is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jærhøns rather than just read about it. In short: The Jærhøns or Norske Jærhøns is the only indigenous breed of domestic chicken in Norway. It is named for the traditional district of Jæren in the county of Rogaland.

Key takeaways

Jærhøns belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Jærhøns to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Jærhøns from memory before moving on to harder problems.

Reference excerpt

The Jærhøns or Norske Jærhøns is the only indigenous breed of domestic chicken in Norway. It is named for the traditional district of Jæren in the county of Rogaland.

History The Jærhøns was the principal chicken breed of Norway until imports of foreign breeds began in the nineteenth century. The Jærhøns was selectively bred at the state-controlled breeding station at Bryne in Jæren from its establishment in 1916 until it closed in 1973. Breeding stock was then transferred to the state agricultural college at Hvam, Nes. Following work done in the first half of the twentieth century, the Jærhøns is auto-sexing. The Jærhøns was listed as a "conservation-worthy national breed" by the Norwegian Forest and Landscape Institute in its 2008–2010 action plan for the conservation and sustainable use of animal genetic resources in Norway.

Characteristics Two colour varieties are recognised for the Jærhøns, dark brown and yellow, and light brown and yellow. The comb is single, and the beak and legs are bright yellow. A bantam Jærhøns with the same two colour varieties was approved in 1994.

Use The Jærhøns lays approximately 215 eggs per year, about 20% less than industrial purpose-bred layers. The eggs are white, and weigh a minimum of 55 g.

References

Further reading T. Twito, S. Weigend, S. Bluma, Z. Granevitzea, M.W. Feldmand, R. Perl-Trevese, U. Lavib, J. Hillela (2007). Biodiversity of 20 chicken breeds assessed by SNPs located in gene regions. Cytogenetic and Genome Research 117: 319–326. doi:10.1159/000103194 Nina Sæther, Anna Rehnberg (2016). Norsk Genressurssenters Handlingsplan for Bevaringsverdige Husdyrraser 2016-2019 (in Norwegian). Norsk institutt for skog og landskap. Nina Sæther, Alvilde Hovden, Peer Berg, Jessica Kathle, Cathrine Brekke, Linn F. Groeneveld (2018). Strategiplan for Genbanken for verpehøns 2018-2027. NIBIO. Nina Sæther (2017). Jærhøns (in Norwegian). Norwegian Genetic Resource Centre. Cathrine Brekke, Linn F. Groeneveld, T. H. E. Meuwissen, Nina Sæther, S. Weigend, P. Berg. (2020).Assessing the Genetic Diversity Conserved in the Norwegian Live Poultry Genebank. Acta Agriculturae Scandinavica, Section A — Animal Science, February. Taylor & Francis, 1–13. doi:10.1080/09064702.2020.1727560.

Illustrations

Worked examples

Example 1 — a first encounter with Jærhøns

Start with the simplest possible case. Write down what Jærhøns claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jærhøns before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jærhøns ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jærhøns

In research: Jærhøns appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Jærhøns in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Jærhøns is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chicken breeds, Chicken breeds originating in Norway, Poultry stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Jærhøns outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jærhøns in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Jærhøns means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Jærhøns out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jærhøns in simple terms?

The Jærhøns or Norske Jærhøns is the only indigenous breed of domestic chicken in Norway. It is named for the traditional district of Jæren in the county of Rogaland.

Why does Jærhøns matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jærhøns?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jærhøns.