Target species
Pigs (nulliparous mature sows).
Indications for use
For the synchronisation of oestrus in nulliparous mature sows.
Contra-indications
Do not use in case of hypersensitivity to the active substance.
Do not use in boars.
Do not administer to pregnant sows or those suffering from uterine infection.
Special warnings for each target species
None
Special precautions for use
Special precautions for use in animals
Ensure the correct dose is administered daily as under dosing can lead to the formation of cystic follicles.
Add the veterinary medicinal product to the feed immediately before feeding.
Discard any uneaten medicated feed.
Use only in sexually mature gilts that have been in oestrus.
Part consumed feed must be safely disposed of and not given to any other animal.
Special precautions to be taken by the person administering the veterinary medicinal product to animals
Women who are pregnant, or suspected to be pregnant, should not use the product. Women of childbearing age should handle the product with extreme care. The product should not be handled by persons with known or suspected progesterone-dependent tumours or thrombo-embolic disorders.
Direct contact with the skin should be avoided. Personal protective clothing (gloves and overalls) must be worn when handling the product. Porous gloves may let this product pass through. Transcutaneous absorption may be even higher when the area is covered by an occlusive material, such as latex or rubber gloves. Accidental spillage on the skin should be washed off immediately with soap and water. Wash hands after treatment and before meals.
In case of accidental contact with eye, rinse abundantly with water. Get medical attention.
Effects of overexposure: Repeated accidental absorption could lead to disruption of the menstrual cycle, uterine or abdominal cramping, increased or decreased uterine bleeding, prolongation of pregnancy or headache.
People with known hypersensitivity to the active substance should avoid contact with the veterinary medicinal product.
Other precautions regarding impact on the environment
When spreading manure from treated animals, the minimum distance to surface water as defined in the national or local regulations has to be strictly respected, because the manure may contain altrenogest which could cause adverse effects in the aquatic environment.
Adverse reactions
Under dosing can lead to the formation of cystic follicles.
Use during pregnancy, lactation orlay
Do not administer to pregnant and lactating sows.
Interactions
Griseofulvin may alter the effects of altrenogest when administered concurrently with this product.
Amounts to be administered and administration route
For oral use as a top-dressing use.
20 mg altrenogest per animal and per day, for 18 consecutive days, corresponding to 5 ml of Virbagest 4 mg/ml oral solution for pigs per day and per animal for 18 consecutive days given orally with feed for immediate consumption.
The volume to be administered should be measured with an appropriate dosing device.
Administration:
Animals should be segregated and dosed individually. Add the product as a top dressing to the feed immediately before feeding. Part-consumed feed must be disposed of with other waste feed and not given to other animals.
The synchronisation of oestrus should be supervised by a veterinarian. Nulliparous mature sows should be segregated not later than 7 days before treatment. During treatment animals should not change the room.
A complete up-take of the medicated feed should be assured.
Most treated gilts will come into oestrus 5 to 6 days after the 18th consecutive day of treatment.
Overdose
No data available.
Withdrawal periods
Meat and offal: 9 days.