Bwala, Dauda Garba; Duncan, N.M. (Neil); Bisschop, S.P.R. (Shahn)
(South African Veterinary Association, 2011-03)
Hens involved in a Newcastle disease study were euthanased at regular intervals according
to a designed protocol. Of these, 7.14%(n = 42) of the 82-week-old specific pathogen-free
breeder hens were found to have ...