The standard schedule

This schedule applies to common commercial layer breeds (ISA Brown, Lohmann Brown, Hy-Line W-36) raised in Kenya. Exact timing may vary slightly by manufacturer recommendation and local disease pressure. Always consult your veterinarian for a farm-specific programme.

Why Newcastle Disease gets so many doses

Newcastle Disease (ND) is the single biggest killer of poultry in Kenya. The virus circulates widely, spreads through air and wild birds, and can destroy an unvaccinated flock within days.

Live vaccines (Hitchner B1, La Sota) provide short-term mucosal immunity — they protect the respiratory tract where the virus first enters. But this immunity fades after 6-12 weeks, so boosters are essential.

The killed (inactivated) vaccine given at week 14-16 provides systemic immunity — antibodies in the blood that last through the entire laying period. Combined with periodic La Sota boosters, this gives comprehensive protection.

Skipping even one ND vaccination creates a window of vulnerability. If the virus arrives during that window, losses can be 50-100% of the flock.

Vaccine administration — how to do it right

Eye drop:

• One drop per eye using the manufacturer's dropper
• Hold the bird upright, tilt the head slightly
• Drop into the eye, wait until the bird blinks (confirms absorption)
• Most labour-intensive but most effective for respiratory immunity

Drinking water:

• Withhold water for 1-2 hours before vaccination (birds must be thirsty)
• Use clean, chlorine-free water (chlorine kills vaccine virus). If using tap water, add skimmed milk powder (2g per litre) to neutralise chlorine
• Mix vaccine immediately before use — never prepare in advance
• Add enough water for all birds to drink within 1-2 hours (calculate 15-20 ml per bird)
• Use non-metallic drinkers (metal inactivates some vaccines)
• Remove automated drinkers and use open drinkers for vaccination to ensure even consumption

Spray:

• Use a hand-held or backpack sprayer
• Coarse spray (droplet size 100-200 microns) for young birds
• Fine spray (50-100 microns) for older birds and boosters
• Spray from above in a closed house. Turn off fans during spraying
• Birds should be visibly wet around the head after spraying

Intramuscular injection:

• Breast muscle (pectoralis major). Inject into the thickest part, avoiding the keel bone
• Use the correct needle size (18-20 gauge, 25mm length for adult layers)
• Change needles regularly (every 500 birds) to prevent injection site infections
• Handle the killed vaccine at room temperature — cold oil adjuvant is harder to inject and causes more tissue reaction

Wing web stab (Fowl Pox):

• Dip the twin-needle applicator into the vaccine
• Pierce the wing web (thin skin between the bones, avoiding blood vessels)
• Check take after 7-10 days: a small swelling or scab at the site means the vaccine worked. No reaction means it did not take — revaccinate

Cost estimates

Vaccination costs for a 300-bird layer flock through the full programme:

That is KES 16-26 per bird for the entire laying period. Compare this to the value of a single hen's production: approximately KES 4,000-5,000 in eggs over 12 months. Vaccination cost is less than 1% of revenue.

What happens when you skip vaccines

Newcastle Disease: Unvaccinated flock exposed to ND virus — 50-100% mortality within 5-10 days. Survivors have permanent production damage. Economic loss for 300 birds: KES 300,000+ (replacement cost plus lost production).

Gumboro (IBD): Destroys the immune system (bursa of Fabricius) in young birds. Even if they survive, they cannot respond to future vaccines effectively. This is called immunosuppression — and it makes every other disease more dangerous.

Infectious Bronchitis: Damages the oviduct in young birds, permanently reducing egg production capacity. A bird infected with IB before week 14 may never reach peak production, even with later recovery.

Fowl Pox: Wet pox (affecting the mouth and throat) can cause 5-20% mortality. Dry pox (skin lesions) reduces production as birds are stressed and eat less.

Record-keeping

For every vaccination event, record:

• Date
• Vaccine name and manufacturer
• Batch number
• Route of administration
• Number of birds vaccinated
• Technician or person administering
• Any adverse reactions observed

This record serves three purposes:

1. Proves compliance if selling to regulated buyers
2. Helps your vet diagnose problems (which vaccines were given and when)
3. Reminds you when the next booster is due

The app can set automatic reminders based on the vaccination date — so you never miss a booster.

Track your vaccination schedule at shira.farm.