[Diagnostic scheme of the causes of embryonal morbidity in poultry]

A diagnostic scheme has been worked out to reveal the factors causing higher embryonic morbidity and mortality rates in birds. It is based on the morphologic analysis and the bacteriologic and mycologic studies, and can be programmed and put into effect in three stages in the course of 48 hours. On the one hand, the post-mortem analysis is useful in establishing the factors of noninfectious character (overheating, insufficient heating, humidity of low or high values, poor air exchange, improper egg position, insufficient air velocity, improper and continuous storage of eggs, deficiency and hereditary diseases). In such cases the scheme provides a special table displaying the correspondence between the morphologic changes and some possible reasons of embryonic mortality, coded from "A" to "K". On the other hand, the bacteriologic and mycologic investigations are helpful in establishing the factors of infectious character (Staphylococcus aureus, Escherichia coli, Salmonella gallinarum-pullorum and other Salmonellae, Pseudomonas aeruginosa, Aspergillus fumigatus, etc.).