Investigations were carried out on the immunogenesis and the serum-protein profile in the treatment of broilers with the protein hydrolysate Hydroprot as well as with Newcastle disease vaccine. The treatment with Hydroprot led to a lower average geometric titer of antibodies--6.4 on the 14th, 6.9 on the 24th, and 6.6 on the 39th day following immunization. Characteristic changes in the serum-protein profile were established--decrease in the total serum-protein, increase in the globulins and particularly in the fractions the peak level of which corresponded to the period of most strongly expressed immunity. The results obtained were associated with the involvement of amino acid synthesis in the immunologic process. They showed that under the effect of the preparation applied there set in enhanced immunogenesis as an expression of changed immune responsiveness.
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