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

Meat from pigs that have been “chemically castrated” could soon be on sale in Britain, with no label to warn shoppers that it contains a controversial drug. Meat produced using the drug does not have to be labelled as such. Live weights were recorded in weeks 1, 4, 12, 18, and The late rise in daily gain can be beneficial if management is aligned. The effect is said to be temporary, but the boars are slaughtered four to six pfizwr later, before it wears off.

After the second injection, testicle size of vaccinated pigs decreased significantly. After slaughtering cold carcass weight, back fat depth, muscle thickness, percent lean meat, and fat and muscle areas of the carcasses were determined. The first dose 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. Improvac is prepared from an analogue of GnRF linked to a carrier protein.

The major predisposing factor to this is absorption of skatole through the skin in a wet and soiled environment. Pfizer says the treatment was approved only after “rigorous” testing to ensure it could not affect consumers through the pig meat or imprlvac environment.

This may lead to stock losses, but improcac is of rare occurrence. But it could be ;fizer by the remaining farmers, and by overseas producers who account for one third of pork eaten in the UK. Pfizer said it disagreed with pflzer description “chemical castration”, but critics argue that — as with use of the term for human sex offenders — the effect is the same. Only for use in male pigs. The recommended site for injection is at the base of the neck, immediately behind the ear. The significant reduction in the testicle size after the second injection indicates a vaccination success.


In weeks 18 and 20, length and width of the testicles of animals of group V were measured. Through its inhibitory effect on GnRF Gonadotrophin Releasing Factor and testosterone production, Improvac Boar Taint Vaccine for Male Pigs also modifies the behaviour of peripubertal male pigs which may be evidenced by increased weight gain during the post-vaccination pre-slaughter period.

Show 25 25 50 All. It would be nice to compete against that when the consumers are informed.

Some swelling may develop at the site of vaccination, and in a small proportion of pigs, may last for several weeks before gradually subsiding. The second dose of vaccine must be given 4 to 5 weeks prior to slaughter to control taint substances already present in the carcase. After vaccination no boar taint was detected in carcasses. Consequently, the information provided on the site in which you enter may not be suitable for use in your country. All animals were negative for boar taint by both cooking and melting tests.

Loading comments… Trouble loading? Certain feedstuffs have also been implicated as a source of high skatole levels in the carcase. It is adjuvanted with a synthetic aqueous adjuvant to increase the level and duration of immunity. Boars vaccinated against boar taint had lower ADW before the second vaccination, but compensated the weight difference after complete vaccination.

David Clarke, AFS chief executive, said: In much of Europe, young males are physically castrated, but in the UK the practice is rarely carried out. The safety assessment of Improvac was every bit as rigorous as a human medicine assessment.

Peter Melchett, policy director of the Soil Association organic movement, said that its primary concern was the impact on the animals. Public sensitivity to chemical castration is likely to be high after the scandal in Ireland, when pork products were contaminated by PCBs — dangerous, man-made chemicals. My Dashboard Profile Logout.

Fears over use of chemicals to castrate pigs

Two doses of vaccine should be administered to entire male pigs at an interval of at least 4 weeks. If this is suspected, seek veterinary advice and notify the registration holder.


Improvac Boar Taint Vaccine for Male Pigs is used to control boar pizer caused by the accumulation of taint substances including androstenone and skatole in entire male pigs.

A piece of the neck muscle from each pig was used to conduct a cooking and melting sensory test. The 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. Effective immunity the development of anti-GnRF antibodies develops approximately 10 to 14 days after administration of the second dose.

For the use by or under the control of a veterinarian only. Uncommonly, environmental sources of skatole can also contribute to taint, equally affecting females, castrates and entire male pigs. It works by injecting pigs twice with a synthetic product that causes the testes to shrink. Food Farming Animal welfare Food safety Pfizer news. Topics The meat industry The Observer. There are also concerns about safety for farm workers who might accidentally inject themselves, and will have to handle bigger animals, said the British Veterinary Association.

Care should be taken to avoid accidental self-injection and needle-stick injury when administering this product. 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. The dose on all occasions is 2 ml, injected subcutaneously. Order by newest oldest recommendations. The above recommendations on method and timing of vaccination, and injection site should be closely followed to ensure optimum effect and minimise carcase damage.

Accidental self-injection may affect fertility in both men and women and pregnancy. Not to be administered by women of childbearing age. Ordering Products Fax no.