NDVP SOP for Laying hens and pullets (vaccinated on litter)
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Standard Operating Procedures
(Note: in accordance with the National ND Management Plan 2008-2012, vaccination and testing requirements vary between states).
1.0 Vaccination program
|Age of birds||Type of vaccine|
|2–4 weeks a, b||Live V4 (MANDATORY IN ALL STATES)|
|10-14 weeks c||Inactivated ND vaccine (MANDATORY IN NSW AND VICTORIA but optional in all other states)|
|12-14 weeks and every 6 to 8 weeks thereafter||Live V4 (NOT A PERMITTED OPTION IN NSW OR VICTORIA) (A permitted option in other states)|
a In addition, where a veterinary advisor feels it is appropriate, live V4 may also be used at day-old but not instead of subsequent recommended vaccination with V4.
b Guidance: In case of multi-age rearing of birds, it is recommended to vaccinate closer to 2 weeks.
c If there is evidence of HI titres lower than 23 prior to administration of inactivated vaccine, additional live V4 should be introduced between 6-8 weeks of age for subsequent flocks.
2.0 Serological target for vaccination outcome
2.1 Titres are defined as adequate if they are:
(i) In Western Australia and Tasmania only (low risk jurisdictions): 23 at 16-18 weeks of age with 66% or more of samples at or above 23. Can be achieved using either V4 on its own or using V4 + Inactivated ND vaccine.
(ii) In Queensland and South Australia (medium risk jurisdictions):
The following options are permitted to achieve 2 3 or above for the duration of the life of the bird;
- Inactivated ND vaccine is optional. Producers using this option do not require monitoring vaccination outcome by serology.
- Continuous vaccination using V4 every 6-8 weeks is permitted if inactivated ND vaccine is not used. This option requires monitoring as per 3.2 and revaccination with V4 or inactivated ND vaccine if titres are below 23and at least 66% of the birds sampled have not reached this titre..
iii) In NSW and Victoria (high risk jurisdictions): 23 from four weeks after the first vaccination with V4 and 25 by 6 weeks post vaccination with inactivated ND vaccine, with 66% or more of samples at or above 25 (mandatory in NSW and Victoria but optional in all other states).
3.0 Sampling frequency (excluding Western Australia and Tasmania) depends on the vaccination program
3.1 Live V4 vaccine + Inactivated ND vaccine
Producers using this program are not required to sample their flocks to demonstrate protection. Records must be kept to demonstrate during any audit that vaccination has taken place.
3.2 Live vaccination every 6-8 weeks (Queensland and South Australia):
3.2.1 A mean titre of 23 or above and 66% of sampled birds reaching this or higher titre must be demonstrated at least 3 times; at 18, 34 and 52 weeks of age.
3.2.2 If birds are kept for longer than 75weeks of age an additional sampling is required at 70 weeks of age.
3.3 All serological sampling is to be undertaken under veterinary supervision or a person approved by the CVO of the relevant state or territory in accordance with the approved sampling protocol.
3.4 On each occasion samples from a minimum of 15 birds must be tested to determine mean titres.
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