Abstract
In connection with the active growth of poultry processing, the issue of rational use of poultry by-products is urgent. The paper proposes hydrolysis of the gizzards of broiler chickens and hens of the parent stock with bifidobacteria liquid concentrate (BLC) and Propionix liquid concentrated starter culture (Propionix LCSC). The effect of enzymatic treatment on changes in the structural components of the gizzards was studied using scanning electron microscopy (SEM) and determination of the dispersed composition. As a result of the research, the multiple regression equations and the response surfaces were obtained, which describe the optimal parameters of the gizzard´s hydrolysis process. The temperature and the time of hydrolysis are factors that have a significant effect on the degree of hydrolysis. The results of the structural and microscopic analysis confirm the high hydrolysability of the by-products by changing its structure and increasing the number of smaller protein particles. It was found experimentally that the gizzards of hens are more susceptible to the action of probiotic microorganisms’ enzymes compared to the gizzards of broiler chickens.
Highlights
The problem of rational use of poultry by-products is relevant for many poultry processing enterprises
The potential of chicken by-products for the production of protein hydrolysates with various functional properties and biological activity has been proven
The results of the study showed that biotechnological treatment of the broiler chickens and hen gizzards with concentrates of bifidobacteria and propionic acid bacteria has a positive effect on the degree of hydrolysis
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Industrial poultry farming is developing rapidly from year to year [1]. Complexes of various capacities equipped with modern technological lines appear in different countries, new technologies for processing poultry are being introduced, and highly productive crosses are being bred. Poultry products are the most important source of animal protein in many countries around the world, and this trend underscores the importance of the poultry processing industry and is driving its continued growth [2]
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