Improvac has been shown to be safe in male pigs from 8 weeks of age . Pfizer Inc. Cornhusker Highway, Lincoln,. Nebraska USA. Synthetic GnRF. Unlike physical castration, which is performed early in a pig’s life, Improvac is administered only a few weeks prior to slaughter and allows pigs to grow naturally. Improvac® Pfizer Animal Health. Contraceptive Product: GnRH protein conjugate . Product Category: Immunocontraception: vaccine against the GnRH. Product.

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Consequently, the information provided on the site in which you enter may not be suitable for use in your country. This product is contraindicated for use in breeding stock.

The first pfzer was administered atthe age of 12 weeks when the animals were moved into the fattening unit and the second dose in week 18, weeks before the planned slaughter date. Not to be administered by women of childbearing age. It works by injecting pigs twice with a synthetic product that causes the testes to shrink.

There are also concerns about safety for farm workers who might pifzer inject themselves, and will have to handle bigger animals, said the British Veterinary Association. The effect is said to be temporary, but the boars are slaughtered four to six weeks later, before it wears off. The safety assessment of Improvac was every bit as rigorous as a jmprovac medicine assessment.

Accidental self-injection may affect fertility in both men and women and pregnancy.


The second dose of vaccine must be given 4 to 5 weeks prior to slaughter to control taint substances already present in the carcase. Boars vaccinated against boar taint had lower ADW before the second improvad, but compensated the weight difference after complete vaccination. The above recommendations on method and timing of vaccination, and injection site should be closely followed to ensure optimum effect and minimise carcase damage.

Animal feed was blamed.

Fears over use of chemicals to castrate pigs

The dose on all occasions is 2 ml, injected subcutaneously. But it could be used by the remaining farmers, and by overseas producers who account for one third of pork eaten in the UK. The significant reduction in the testicle size after the second injection indicates a vaccination success. Food Farming Animal welfare Food safety Pfizer news. Peter Melchett, policy director of the Soil Association organic movement, said that its primary concern was the impact on the animals.

Zoetis – Product Improvac® | Zoetis ZA

Jmprovac RSPCA said farmers in its Freedom Foods scheme could use Improvac from later this month if they convinced managers that it would help animal welfare, for example by reducing aggression between boars. Threads collapsed expanded unthreaded.

Topics The meat industry The Observer. Pfizer said it improvax with the description “chemical castration”, but critics argue that — as with use of the term for human sex offenders — the effect is the same.

Fears over use of chemicals to castrate pigs | Environment | The Guardian

It would be nice to compete against that when the consumers are informed. In much of Europe, young males are physically castrated, but in the UK the practice is rarely carried out. Pfizer says the treatment was approved only after “rigorous” testing to ensure it could not affect consumers through the pig meat or the environment. The recommended site for injection is at imprvac base of the neck, immediately behind the ear.


Pharmaceutical giant Pfizer developed the drug, Improvacto allow farmers to grow pigs bigger before slaughter but without them releasing the hormones that cause boar taint, a taste many consumers dislike.

Vaccination as well as surgical castration reliably prevents the incidence of boar taint. Ordering Products Fax no. Barney Kay, general manager of the UK’s National Pig Associationsaid the association wanted more research into consumer attitudes, but noted that farmers in a low-margin business could not afford to ignore the vaccine. Show 25 25 50 All. An injection to prevent puberty in male pigs was licensed for use in Britain and most of Europe last year, and has gone on sale to farmers who produce pork.

Regulatory constraints and medical practices vary from country to country.

If this is suspected, seek veterinary advice and notify the registration holder. Uncommonly, environmental sources of skatole can also contribute to taint, equally affecting females, castrates and entire male pigs. Improvac is prepared from an analogue of GnRF linked to a carrier protein.