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.

Author: Gurr Maull
Country: Sudan
Language: English (Spanish)
Genre: Education
Published (Last): 23 October 2017
Pages: 119
PDF File Size: 6.46 Mb
ePub File Size: 18.91 Mb
ISBN: 924-4-54091-847-4
Downloads: 34417
Price: Free* [*Free Regsitration Required]
Uploader: Daitaxe

After the second injection, testicle size of vaccinated pigs decreased significantly. Not to be administered by women of childbearing age.

Fears over use of chemicals to castrate pigs

A piece of the neck muscle from each pig was used to conduct a cooking and melting sensory test. All animals were negative for boar taint by both cooking and melting tests. Food Farming Animal welfare Food safety Pfizer news.

Vaccination as well as surgical castration reliably prevents the incidence of boar taint. In much of Europe, young males are physically castrated, but in the UK the practice is rarely carried out.

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.

This may lead to stock losses, but fortunately is of rare occurrence. 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. The late rise in daily gain can be beneficial if management is aligned. Consequently, the information provided on the site in which you enter may not be suitable for use in your country.

Live weights were recorded in weeks 1, 4, 12, 18, and Topics The meat industry The Observer. The recommended site for injection is at the base of the neck, immediately behind the ear.


The second dose of vaccine must be given 4 to 5 weeks prior to slaughter to control taint substances already present in the carcase. Regulatory constraints and medical practices vary from country to country. Certain feedstuffs have also been implicated as a source of high skatole levels in the carcase. The second dose, at least 4 weeks after the first dose, is essential to limit the further production of taint substances.

Pfizer said it was currently “being used by a small number of pig farmers in the UK”. Threads collapsed expanded unthreaded. 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. But the AFS, the country’s biggest farm certification scheme, has rejected it, fearing a public backlash. Pfizer said it disagreed with the description “chemical castration”, but critics argue that — as with use of the term for human sex offenders — the effect is the same.

The dose on all occasions is 2 ml, injected subcutaneously.

Loading comments… Trouble loading? Only for use in male pigs. The second dose should be given 4 to 5 weeks prior to slaughter. Consumers should be better informed about such changes to their food, added Waygood.

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

This vaccine has been fully tested for potency, sterility and safety before issue but it must be stressed that the correct improac procedure in the field is equally important if secondary infection is to be prevented. It would be nice to compete against that when the consumers are informed. Inadvertent vaccination of male breeding stock may affect subsequent fertility. 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.

Entire male pigs intended for slaughter at impgovac weeks of age will therefore receive their second dose of vaccine at 21 to 22 weeks of age, their first dose of vaccine having been given at 17 to 18 weeks of improvzc or earlier.


The effect is said to be temporary, but the boars are slaughtered four to six weeks later, before it wears off. 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.

Effective immunity the development of anti-GnRF antibodies develops approximately 10 to 14 days after administration of the second dose. Improvac Boar Taint Vaccine for Male Pigs is used to control boar taint caused by the accumulation of taint substances including androstenone and skatole in entire male pigs. Boars vaccinated against boar taint had lower ADW before the second vaccination, but compensated the weight difference after complete improvwc.

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. For the use by or under the control of a veterinarian only. 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.

Improvac, which has been used in Australia for a decade and is now approved in 53 countries, is marketed as a “vaccine… for the reduction of boar taint” and an alternative to physical castration of pigs.

If this is suspected, immprovac veterinary advice and notify the registration holder.