Protozoal incidence in balady chicken flocks after viral vaccinations

Document Type : Original Article

Authors

1 Department of parasitology, faculty of Veterinary Medicine. Benha University

2 Animal health research institute-Benha

3 Animal health research institute-Shebin El-Koam

Abstract

The present study aimed to detect the incidence of protozoan parasites and their disease severity in
balady chickens in relation to the routine viral vaccinations against Newcastle, Infectious bronchitis and
Infectious bursal diseases. For this purpose, eight hundred balady chicks divided to 8 equal groups, 4
groups not artificially infected by Eimeria while the other 4groups were artificially infected. The
collected samples were examined daily and the detected protozoa were Eimeria spp. (31%) and
Cryptosporidium spp. (10%) during the vaccination period. The vaccinal dynamic revealed that the
highest incidence of Eimeria (64%) was recorded in G2, while minimum oocyst count / gm feces (
0.25×103 ) in G 6 at 14 days old, then a rapid , increase, specially 1- 2 days old after each vaccinal
application to reach maximum (35×103 ) at the 30 days old. The lowest incidence of Eimeria spp., was
in G 1& G3 (0%) and the minimum oocyst count / gm feces (0.1×103) and gradually increased to reach
maximum (0.45×103) at 18 days old, then decreased again to (0.1×103) at the end of experiment in G7.
It was concluded that stress caused by viral vaccinations affecting both incidence and severity of
protozoal diseases, especially Eimeria on non-treated chicken groups.

Keywords

Benha Veterinary Medical Journal
Volume 29, Issue 1
September 2015
Pages 108-111

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