engleski

Unusual pathomorphological findings in one-day-old poultry: Case reports

Background: Two cases of gross lessions closely resembling runting stunting syndrome (RSS) / malabsorption syndrome (MAS) in 1-day-old pullets (case 1) and in poults (case 2), were described in the present paper. Furthermore, along with these extremely rare pathomorphological changes in 1-day-old poultry, haemorrhagic bursitis in pullets and signs of generalised arteriosclerosis in poults were histopathologically confirmed. A review of the available literature data did not yield any report on at least one of the pathomorphologically confirmed conditions occurring naturally in 1-day-old poultry, as presented in this case reports. The owners’ limited anamnestic information (e.g. about the vaccination in both young poultry and in the parent flocks), and their permission for only a few additional examination procedures in both cases, left us in the position of speculating on the possibility of vertical transmission of RSS (both cases) ; infectious bursal disease virus (IBDV) breakthrough infection (case 1), and hatchery technology or genetic impact in case of generalised arteriosclerosis in day-old poults (case 2). Case presentations: A few months ago, an increased mortality rate was observed in a pullet flock aged up to 2 weeks at one Croatian farm (case 1). Gross lesions, closely resembling RSS, were seen in all (52) the examined pullets aged 1, 4 and 15 days. In 30 (57.69 %) carcasses of 1- to 4-day-old pullets, haemorrhagic bursitis was also sporadically observed. During a routine necropsy in 2014 and 2015, in 50 (65.79 %) out of a total of 76 male broiler turkey carcasses coming from different hybrid lines, pathomorphological changes typical of RSS / MAS (notably degenerative changes in the pancreas) were confirmed in newly hatched poults (case 2). In 0-day-old and in the poults aged two weeks, various generalised arteriosclerotic changes were histopathologically confirmed in all the examined organs. In both cases, the predominant lesions of RSS / MAS were also confirmed at the age of 15 days. As an accompanying finding, Escherichia coli (E. coli) was confirmed in all the pullet age groups, and turkey astrovirus 1 (TastV-1) was isolated from only one poult aged 15 days. Conclusions: The pathomorphologically diagnosed conditions are important because they are described and reported for the first time in the presented age groups of the poultry (0, 1 and 4 days of age). In the authors’ opinion, these reports on potentially immunosuppressive conditions and diseases in 0- and 1-day-old poultry should stimulate further research in the identification and erradication of key etiopathogenetic factors.

patomorfologija, kokica, purić, hemoragični burzitis, zarazna bolest Fabricijeve burze (ZBFB), sindrom zarazne kržljavosti (SZK), sindrom malabsorpcije (SMA), kolibaciloza, arterioskleroza

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