science

Progesterone devices used in farm animals

Progesterone devices used in farm animals 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 Progesterone devices used in farm animals rather than just read about it. In short: Progesterone devices are broadly used in the control of reproductive management in livestock. They work by increasing circulating plasma progesterone levels with the following consequences: Progesterone suppresses the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus.

Key takeaways

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

Reference excerpt

Progesterone devices are broadly used in the control of reproductive management in livestock. They work by increasing circulating plasma progesterone levels with the following consequences:

Progesterone suppresses the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus. This is done via a negative feedback to the hypothalamus neuroendocrine cells, by inhibition of KiSSpeptin KiSS1-derived peptide receptor, a protein needed for the release of GnRH. Low levels of GnRH prevent the emergence of a dominant follicle by reducing the release of LH and FSH hormones. Current follicular waves cease and a new wave emerges 3–5 days after implant. A dominant follicle develops but there is no ovulation as LH release is prevented by suppression of GnRH. Removal of progesterone device produces a surge of GnRH, generating a pulse of LH that induces ovulation.

Methods of progesterone administration Progesterone Releasing Intravaginal Device (PRID). For use in cattle and buffalo. They consist on a stainless spiral coil coated with an inert silicone rubber matrix impregnated in progesterone (1.55g). It has a nylon string that is placed hanging out of the vagina. Tying a loop on the string can facilitate removal of the device in the event the string is shortened to prevent rogue heifers or cows pulling them out. The coil has been commercially available since the mid-1970s. It originally included a capsule of oestradiol valerate. The use of oestrogens in the food producing industry in the EU was banned in 1981 because of their suggested carcinogenic effects. These substances are still approved for use in the US and many other countries, including Australia and Canada. The coil is licensed to use with fixed time artificial insemination Controlled Internal Drug Release (CIDR). For use in cattle and buffalo. This is a T-shaped silicone elastomer device impregnated in progesterone (1.38g). It has a plastic tail to ease removal. The curve of plasma progesterone in ovariectomised cows fitted with either PRID or CIDR show similar overall levels with a more obvious initial peak in the coil versus the t-shaped device. It has been suggested that this increased level of plasma progesterone is due to optimal contact of the coil with the vaginal walls. Some heifers resent insertion of either device as it involves penetration of the hymen. Device retention is high (around 98%) in both PRID and CIRD. Reasons for loss include overlubrication, pneumovagina, rogue cows pulling out the nylon string or plastic tail and slack cows, large breeds after several calvings.

Other devices Progestogen ear implant. Progestogen impregnated intravaginal sponge. For use mainly in sheep.

Clinical uses of Progesterone devices Synchronisation of oestrus in conjunction with prostaglandin F2α. The PGF2α injection helps to ensure there is no residual CL and the potentially ovulating follicle has been held primed for less time, enhancing its viability. Protocol: Progesterone for 9 days. PGF2α injection on days 5–8. Serve on observed oestrus or fixed time once at 56h or twice at 48h and 72h. Induction of oestrus in anoestrus cows. Treatment of follicular cysts Persistent ovarian follicles Improve oocyte quality Reduction of early embryonic death and improved fertility Treatment of repeat breeders Increased fertility in embryo transfer protocols

References

Worked examples

Example 1 — a first encounter with Progesterone devices used in farm animals

Start with the simplest possible case. Write down what Progesterone devices used in farm animals 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 Progesterone devices used in farm animals 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 Progesterone devices used in farm animals 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 Progesterone devices used in farm animals

In research: Progesterone devices used in farm animals 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 Progesterone devices used in farm animals 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: Progesterone devices used in farm animals is common in secondary-school and first-year university syllabi. It links to neighbouring topics Theriogenology, Veterinary drugs, so understanding it makes those chapters shorter.
In everyday life: Look for Progesterone devices used in farm animals 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Progesterone devices used in farm animals in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Progesterone devices used in farm animals 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 Progesterone devices used in farm animals out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Progesterone devices used in farm animals in simple terms?

Progesterone devices are broadly used in the control of reproductive management in livestock. They work by increasing circulating plasma progesterone levels with the following consequences: Progesterone suppresses the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus.

Why does Progesterone devices used in farm animals 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 Progesterone devices used in farm animals?

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 Progesterone devices used in farm animals.