Immunity is produced when poultry are vaccinated, although the vaccine in itself cannot guarantee it. When vaccination failures occur, the total vaccination program should be reviewed. Although vaccination offers a method of preventing many poultry diseases from establishing themselves, certain drugs and antibiotics are needed to help alleviate the. Aug 09, 2021 Plan to vaccinate your entire flock at one time. Some vaccines, such as Marek's vaccine, are best performed by the hatchery. Hatcheries and poultry suppliers are usually the best sources for vaccine. Be sure to carefully follow label directions when vaccinating for optimal protection in your birds. Thunderbird Medication and Vaccination Program - Free download as Word Doc (.doc /.docx), PDF File (.pdf), Text File (.txt) or read online for free. For every sabungeros and gamefowl fanatics out there!
Vaccines can dramatically reduce losses when used correctly to prevent disease in animals.
There are different types of vaccines: live vaccines give long immunity after a single dose, while; inactivated vaccines need booster doses to maintain immunity. Anti-toxins are not vaccines - they provide immediate but short-term protection against a disease.
Selecting the right vaccine
It is important to know which diseases animals should be vaccinated against. There are some common diseases that animals should be routinely protected against such as tetanus in horses or botulism in cattle. In some circumstances, disease should be diagnosed by a private veterinarian who will advise whether vaccination is recommended. Vaccine use should be part of a whole herd or flock health management program, incorporating biosecurity and disease prevention measures.
Some diseases may have several strains of causal organisms and some vaccines cover several disease complexes, so it is important to buy the correct vaccine for the situation. This is particularly relevant where more than one type of vaccine is available (e.g. five-in-one or seven-in-one vaccine for cattle). Seven-in-one vaccine is a five-in-one vaccine that has been combined with two strains of leptospirosis vaccine. Leptospirosis is a contagious bacterial disease that affects young calves and breeding females, causing stillbirths and abortion in late pregnancy. It is more expensive than the five-in-one vaccine so its use should be targeted to reduce costs.
It is also important to check that a vaccine is registered for the stock being vaccinated (e.g. there is a three-in-one and a six-in-one vaccine registered for sheep and lambs only, as well as two similar products which are registered for goats and kids in addition to sheep and lambs).
Some vaccines registered for the same disease but manufactured by different companies have different dosage regimes and booster recommendations (e.g. botulism vaccines for cattle and infectious bronchitis and Newcastle disease vaccines for poultry).
Buy only what you need
Vaccines are expensive and it is important to buy only as much as you need. Many vaccines are administered with a repeating syringe and you will need enough doses to vaccinate all animals, allow for some waste and accidents.
Many poultry vaccines come in 1000-dose lots, which are inconvenient for small-scale producers. However, keeping opened containers or reconstituted vaccines is not recommended. This practice may cause the vaccine to fail to achieve protection and it could also cause illness due to the growth of contaminants in reconstituted vaccines.
Storing vaccines
As vaccines are biological products they will slowly lose their potency, even when stored under ideal conditions. The manufacturer has determined the expiry date for each batch of vaccine and provided it is stored correctly, it will retain its full potency up to the date shown.
Each vaccine has specific storage conditions. The majority of vaccines must be stored in a refrigerator where they are kept cold but not subject to freezing and thawing. Freezing may reduce the potency of some vaccines and may cause local reactions at the injection site.
Follow label instructions
Vaccines must pass rigorous examination of their efficacy and safety by the Australian Pesticides and Veterinary Medicines Authority before they can be sold. They are produced under the most stringent conditions and if they are not handled and administered correctly after leaving the production facility, their effectiveness can be reduced or non-existent.
The label on the vaccine carries important information about using the vaccine correctly: dosage; injection site; recommended vaccination program; and storage instructions. Users of veterinary chemicals are required by law to follow the label instructions unless they are using the chemical according to an approved permit or as directed in written instructions from a veterinarian. Vaccines are expensive and the label instructions should be followed to make the most of your investment.
Use sterile and safe equipment
Vaccines are usually administered by a syringe and needle although some are administered in the water supply or intranasally. Many vaccines are packaged in multi-dose containers for use with automatic syringes, which must be calibrated to deliver the right dose.
Needles should be sharp and as short as possible when vaccinating subcutaneously. Long needles may break or deposit the vaccine into the muscle instead of under the skin.
It is important that infection is not introduced when vaccinating animals. Equipment can be sterilised between use in a pressure cooker for 15 minutes, or by boiling in an open pan for 40 minutes. Chemicals, such as disinfectants or methylated spirits, should not be used as they may make the vaccine ineffective. After syringes and needles have been sterilised they should be kept in a covered container to protect them from dust.
Administering vaccines
In general, vaccines take 10-14 days to give protection. Vaccination should be part of a herd or flock health program. For vaccines to be most effective consider their use carefully in relation to the type of stock, season, previous property history and disease incidence e.g. young animals should be protected against the common and predictable diseases before management events such as castration, shearing, weaning and movement to new properties.
To get the most out of your vaccines protect them from heat or sunlight by keeping them in an Esky until required. Keep vaccines and equipment away from dirt and dust, which can contaminate equipment and introduce infection. Use a small table to help keep vaccines and equipment clean and off the ground.
Do not mix different vaccines together. Combined vaccines require a great deal of care in balancing the components. However, if more than one vaccine is required use separate syringes and administer them at different sites, at least 15 cm apart and preferably on different sides of the animal's body.
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If conducting tick fever vaccinations, do not give other vaccinations at the same time. If it is unavoidable, use a separate syringe for each treatment and administer them on opposite sides of the animal's body. Ideally, other inoculations should be performed either two weeks before or four weeks after tick fever vaccination, particularly in adult animals, which are more likely to react to the tick fever vaccine.
Avoid carcass damage by administering the vaccine according to label instructions and use the least commercially valuable site on the animal, for example high on the neck behind the ear.
When vaccinating a herd, ensure a full dose of vaccine is given to every animal. Check syringes carefully to ensure that the correct dose is being delivered. Give the required booster injection at the correct time to all animals that require it.
Keep people safe
Some animal vaccines can cause a serious reaction if accidently injected into people. Therefore, the person administering the vaccine should concentrate on the safe use of the syringe and needle and not attempt other tasks such as moving or restraining the animal.
Further information
I have started a series of articles on LinkedIn on various aspects of Poultry Industry. Purpose is to educate colleagues on LinkedIn about the different segments of Poultry Industry as a whole. Some of the contents are taken from reliable sources as well.
Vaccination plays an important part in the health management of the poultry flock. There are numerous diseases that are prevented by vaccinating the birds against them. A vaccine helps to prevent a particular disease by triggering or boosting the bird’s immune system to produce antibodies that in turn fight the invading causal organisms.
A natural invasion that actually causes the disease will have the same result as the bird will produce antibodies that fights the current invasion as well as to prevent future invasions by the same causal organisms. Unfortunately birds that become diseased usually become unthrifty, non-productive or even die. An infection caused by natural invasion will be uncontrolled and therefore has the possibility of causing severe damage, however vaccination provides a way of controlling the result with minimal harm to the birds.
Vaccines are generally sensitive products, some of which are live but in a state of suspended animation. Others are dead. All have a finite life that is governed by the way they are handled and used. Handling and administration procedures also influence the potency of many vaccines and consequently the level of immunity the bird develops.
Types of vaccines
Live vaccine – the active part of the vaccine is the live organism that causes the disease. As such, it is capable of inducing the disease in birds that have not had previous contact that organism. Vaccinated birds, in many cases are able to infect non-vaccinated birds if housed together.
Attenuated vaccine – with this type of vaccine the organism has been weakened by special procedures during manufacture so that it has lost its ability to cause the serious form of the disease. At worst, the birds may contract a very mild form of the disease, however, the vaccine still has the ability to trigger the immune system to produce antibodies.
Killed vaccine – with this type of vaccine the organism has been killed and is unable to cause the disease, although the ability to trigger the immune system remains. In many cases, the level of immunity produced by this form of vaccine is weaker than that produced by live and attenuated vaccines.
Vaccine production
Vaccines are produced mainly in three forms:
1. Liquid vaccine – it is in fluid form ready to use.
2. Freeze dried vaccine – the vaccine is stored as one pack of freeze dried material and one pack of diluent, often a sterile saline solution. These have to be combined before use.
3. Dust – where the vaccine is prepared for administration in the dry form.
Vaccines are sold in dose lots, the number of doses being the number of fowls that may be vaccinated with that amount of vaccine when using the recommended technique. In the case of many vaccines there are differences in the disease organism strains that they are effective against. It is important that the correct vaccine strain be used and this can only be determined by veterinary advice.
Handling vaccines on the farm
Vaccines are fragile in many respects and require very careful handling to ensure they retain their potency. Poor handling procedures will, in most cases, result in a rapid decline of potency.
The important handling requirements on the farm are:
On receipt of the vaccine on the farm, check and record:
1. That the vaccine has been transported in the recommended manner which is usually in the chilled or frozen state. Prolonged exposure to atmospheric temperature will result in rapid loss of potency.
2. Type of vaccine – is it the vaccine ordered.
3. The number of doses – has the correct amount been delivered.
4. The expiry date of the vaccine – vaccines have a date by when there is a significant risk that they will no longer retain their potency and will not produce the immunity required. The expiry date is based on the vaccine being handled and stored in the recommended manner.
· As soon as possible place the vaccine into recommended storage conditions. Read the instructions to find out what these are. However, freeze dried material should be kept at a temperature below freezing and its diluent at a temperature just above freezing. Liquid vaccines are generally kept at temperatures just above freezing.
· Remove the vaccines from storage immediately prior to their being used. Only remove and re-constitute enough for immediate needs and repeat this through the day if more is required. Do NOT mix what is required for an entire day at the start of the day and leave it stand until required, as the vaccine will rapidly lose it efficacy.
· Protect the vaccines after mixing by holding them in an ice bath. Place ice in a small container and place the container of mixed vaccine in the ice. Some vaccines have a very short life once mixed. For example, Marek’s Disease has a life of about 1.5 hours after mixing IF HELD IN AN ICE BATH. It is much shorter if held in higher temperatures.
· Use the recommended administration techniques and do not vary these without veterinary advice.
· Always clean and sterilise the vaccinating equipment thoroughly after use.
· Always destroy unused mixed vaccines after the task has been completed. Some vaccines have the potential to cause harm if not destroyed properly.
· Do not vaccinate birds that are showing signs of disease or stress.
Vaccination procedures
There are a number of ways that vaccines may be administered to poultry and it is very important that the correct method be used for each vaccine. To use the wrong method will often result in failure of the vaccine to produce the desired immunity. Some of the methods require the operator to handle every bird and, consequently are time consuming and stressful to the birds and operator. Other methods involve administration by methods much less stressful and time consuming. These methods include administration via the drinking water or as an aerosol spray. The different ways that the vaccines may be administered to poultry are below.
In-ovo vaccination
Using the method of in-ovo vaccination, the vaccine is administered into the embryo before hatch.
In general, vaccines can be applied to five different areas of the egg: the air cell, the allantoic sac, the amniotic fluid, the body of embryo and the yolk sac. Vaccine uptake and therefore the immune response of the chicken depend largely on the area of injection. While injection in the air cell has been shown to be minor/not effective, injection in the body of the embryo or the allantoic sac is effective. Therefore, the optimum period to inject the embryo is in the late stage of development, i.e. the time between the ascendance of the stalk of the yolk sac into the abdomen (about the time when the chicken tucks its head under its wings) and external pipping.
During that late stage of development, the embryo is mature enough to cope with the viral stimulus and the trauma induced by the penetrating needle is unlikely to cause severe tissue damage. Signs of too early vaccination include reduced hatch-ability, late death and increased number of culled birds. However, if vaccination is done too late in embryo-nation, the risk of egg shell breakage is significantly higher. Therefore, in ovo vaccination is commonly performed between days 18-19 of incubation.
The system of a larger outer needle (penetrating the egg shell) that contains an inner needle (penetrating the embryo) enables for strong but careful penetration of the egg and minimizes trauma to the embryo. In addition, the use of two needles reduces the likelihood of transferring contaminants on the outer egg shell into the sterile embryo. The needle for punching the egg shell should not penetrate the embryonic cavity (the inner shell membrane, the chorio-allantoic membrane or air cell membrane). While the penetration of the outer egg shell increased the relative pore volume about 30%, the risk for increased gas exchange of the embryo occurs.
Hygiene management including reduced air circulation, well maintained air filters, adjustment to weather conditionsand well maintained hatchery insulation has to be taken into account when performing in ovo inoculation. Only strict management of these environmental factors can reduce the likelihood of infections of the egg, especially with aspergillosis or other air-borne pathogens. Continuous training of reliable staff is of highest priority to prevent reduced hatchability and to maintain high hygienic standards. A sterile environment and the usage of chlorine based sanitizers are crucial. The storage and preparation of the vaccine in a separate biosecure area as well as strict precautions in using sterile devices such as containers and water should be implemented. While the cost of machine acquisition is high, the investment can pay back by its advantages.
The advantage of commencing immunity development before hatch can prevent young chicks from early infection after hatch. Since high tech machines are used for in ovo injection, the volume and concentration of the vaccine to be administered are highly standardised, reducing human error and labour cost when compared to vaccination of chickens later in life. Furthermore, vaccination of every single chicken can be ensured resulting in better uniformity of the flock. Coming with this is improved animal welfare due to less handling of birds later in life.
Currently Marek’s disease, Newcastle disease, infectious laryngotracheitis and infectious bursal disease vaccines are routinely administered using in ovo vaccination in various countries. In ovo vaccination does not interfere with maternal antibodies that may still present in the embryo. In fact, it increases the level of immunity and as a consequence one injection is sufficient to offer life-long protection against the target disease.
Intramuscular injection
This method involves the use of a hypodermic needle or similar equipment to introduce the vaccine into the muscle (usually the breast muscle) of the bird. The task is sped up greatly by the use of an automatic syringe which makes the technique relatively easy and doesn’t harm the bird. Care must be taken to ensure that the correct dose is administered to each chicken and the equipment should be checked regularly to ensure this.
Care must be taken to ensure that the needle does not pass through into a key organ and that other unwanted organisms are not administered to the bird at the same time by contaminated vaccine or equipment. Contamination can be prevented by good hygiene and recommended vaccine handling procedures.
Subcutaneous injection
This method involves the use of similar equipment to that used for the intramuscular technique. The main difference between the two techniques is that, in this case, the vaccine is injected under the skin, usually at the back of the neck, and not into the muscle. Care must be taken to ensure that the vaccine is injected into the bird and not just into the feathers or fluff in the case of very young chickens. The dose being administered should be checked for accuracy frequently. Maintain good hygiene practices to limit introducing contaminating organisms during the procedure.
Ocular
This method involves the vaccine being put into one of the bird’s eyes. From here the vaccine makes its way into the respiratory tract via the lacrimal duct. The vaccine is delivered through an eyedropper and care must be taken to ensure that the dropper delivers the recommended dose. If it is too little, the level of immunity may be inadequate, while if too much, the vaccine may not treat the total flock but will run out beforehand.
Nasal
This method involves introducing the vaccine into the birds’ nostrils either as a dust or as a drop. Always ensure that the applicator delivers the correct dose for the vaccine being used.
Oral
With this method the vaccine dose is given in the mouth. From here it may make its way to the respiratory system or it may continue in the digestive tract before entering the body.
Vaccination Program For Gamefowl
Drinking water
With this method the vaccine is added to the drinking water and, as a consequence, is less time consuming and is significantly less stressful on the birds and operator. Take care to ensure the vaccine is administered correctly as there is much scope for error. The recommended technique observes the following:
· All equipment used for vaccination is carefully cleaned and free of detergents and disinfectants
· Only cold, clean water of drinking quality should be used
· Open the stopper of vaccine bottle under water
· The water present in the drinking trough should be consumed before vaccination
· By ensuring that all birds drink during the vaccination phase, all should receive an adequate dose of the vaccine
Cloacal
This method involves the introduction of the vaccine to the mucus membranes of the cloaca with an abrasive applicator. The applicator is firstly inserted into the vaccine and then into the bird’s cloaca and turned or twisted vigorously to cause an abrasion in the organ. The vaccine enters the body through the abrasion. The technique is time consuming and stressful to the birds and care must be taken to ensure no contamination is introduced with the vaccine particularly from bird to bird. As a rule, the technique is not used on commercial farms.
Feather follicle
With this method the vaccine is introduced into the feather follicles (the holes in the skin from where the feathers grow). The technique involves the removal of a group of adjacent feathers or fluff in young chickens, and the brushing of the vaccine into the empty follicles with a short, stiff bristled brush. Good hygiene is necessary to prevent the introduction of contaminant organisms with the vaccine.
Wing stab
With this method the vaccine is introduced into the wing by a special needle(s). These needles have a groove along their length from just behind the point. When dipped into the vaccine some of the vaccine remains on the needle to fill the groove. The needle(s) are then pushed through the web just behind the leading edge of the wing and just out from its attachment to the body of the bird. Care must be taken to select a site free of muscle and bone to prevent undue injury to the bird. Ensure that the needles penetrate the layers of skin at the ideal site. A common problem is for the vaccine to be brushed from the needles by fluff or feathers before it is brushed into the follicles.
Spray
With this method the vaccine is sprayed onto the chickens (or into the air above the chickens) using a suitable atomiser spray. The vaccine then falls onto the chickens and enters the body of other chickens as they pick at the shiny droplets of vaccine. A small quantity may be inhaled as well.
Monitoring
Complete Vaccination Program For Gamefowl
In the case of some vaccines, an important part of the procedure is to ascertain whether the vaccine has worked, or “taken”. A good example of this is fowl pox vaccine, which is administered by wing stab. Within 7 to 10 days after vaccination a “take” should appear at the vaccination site. This is in the form of a small pimple one half to one centimetre in diameter. If the take is larger and has a cheesy core, it indicates that contaminants have been introduced either with the vaccine or with dirty vaccinating equipment. A check for takes would involve inspecting approximately 100 birds for every 10,000 vaccinated.
Another example of whether the birds are reacting satisfactorily to the vaccination is the systemic reaction found in chickens vaccinated against infectious bronchitis disease. In many cases the birds react approximately 5 to 7 days after vaccination by showing signs if ill health such as slight cough, a higher temperature and lethargy. In cases where there are no obvious signs of success, blood samples may be taken and sent to the laboratory for examination. The usual test is for the presence of an adequate number of the appropriate antibodies (called the titre) in the blood. If the vaccination has been unsuccessful, it may be necessary to re-vaccinate to obtain the desired protection.
Failure to find evidence of success could be because of:
· Faulty technique resulting in the vaccine not being introduced into the vaccination site.
· Faulty vaccine – too old or not stored or mixed correctly. It would be unusual but not impossible for the vaccine to be faulty from manufacture.
· The birds are already immune i.e. the immune system has already been triggered as a result of parental (passive) immunity, previous vaccination or other exposure to the causal organism.