Newcastle Disease Control In Free Range Chicken Using I-2 Vaccine In Selected Districts In Kenya PDF Print E-mail
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Wednesday, 03 August 2011 05:47

Wachira A.M1*., Wachira J. W2., Ireri R. G3 and Waithaka M. W1.

1KARI Naivasha, P. O. Box 25-20117, Naivasha

2KEVEVAPI, P. O. Box 53260-00200, Nairobi

3KARI Muguga North, P. O. Box 32-09020, Kikuyu

* Corresponding author: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Abstract

A major constraint to indigenous chicken productivity in Kenya is Newcastle disease (ND) which is capable of causing 100% mortality in unprotected flocks. Outbreaks of ND are unpredictable and often discourage farmers from investing in the production and marketing of indigenous chicken.  Vaccination against ND is the only intervention that protects chicken from Newcastle disease. Commercially available vaccines for the control of ND are effective but require the cold chain during storage and transportation to end users.  As such they are not suitable for small, multi-aged scattered free ranging chicken in arid and semi arid areas where cold chains and other infrastructure are rarely available.  The need for a new vaccine appropriate for  indigenous chicken production systems,  rather than trying to utilize existing commercial vaccines with their deficiencies was the subject of the current study. A live thermostable avirulent I-2 ND vaccine was developed in Australia to overcome some of the challenges in developing countries. In this study, I-2 ND vaccine was adopted, produced and validated under field conditions in free ranging indigenous chicken in Busia, Naivasha, Nyandarua, Mwea and Mwingi districts. Results obtained show that less than 5% of the indigenous chicken in these districts had protective antibodies against ND virus prior to vaccination. This shows that chicken in the study districts are highly susceptible to virulent ND virus. Twenty-one days post vaccination with a single dose of I-2 ND vaccine the protection level increased to 62%.  This response following vaccination clearly shows that the administration of the I-2 ND vaccine through the intra-ocular route is an effective way of controlling Newcastle disease in free ranging indigenous chicken. Recommendations from the study are that the vaccine is registered for commercialization.  Economic analysis indicate that I-2 ND vaccination has the potential to save 20 million chicken valued at 5 billion Kenya shillings.

Key word; Thermostable, Newcastle disease; free range chicken
 
   

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