The aim of the conducted studies was a comprehensive assessment of the clinical and physiological state of laying hens, which included a fish feed additive (DCR) in the main diet. The composition of the new Prinarovskaya DKR includes chilled river fish, its processed products and grain products (wheat bran). The additive preparation process goes through several stages: grinding, cavitation heating and subsequent drying of the resulting mixture. The investigated additive is a homogeneous dry mass and contains a number of amino acids, vitamins and minerals in its composition. DKR "Prinarovskaya" was fed to laying hens of the Lohmann Lsn-Classic breed of 130 days of age. All chickens participating in the experiment were divided into 4 groups. Chickens of the 1st experimental group included 8 g of "Prinarovskaya" additives per 100 g of the main diet; chickens of the 2nd experimental group - 6 g of additives to OR; chickens of the 3rd experimental group – 4 g of additives to OR; 4-control group of chickens were fed only OR – compound feed PK1-1G-1227, prepared in accordance with GOST R 51851-2001. The usefulness of poultry feeding is reflected in the morphological and biochemical parameters of blood, which served as the basis for using them in an experiment to characterize metabolic processes and assess the state of the body of laying hens. An important indicator of the effect of the new feed additive "Prinarovskaya" on metabolic processes was the determination of the concentration of total protein and the main protein fractions (albumins, globulins). The state of lipid metabolism in terms of cholesterol and triglycerides was analyzed. Indicators of carbohydrate metabolism and the functional state of the liver were also studied. To characterize the mineral metabolism, the level of calcium and phosphorus in the blood serum was determined. The conducted study with a comprehensive assessment of morphological and biochemical parameters of blood confirmed the expediency of including Prinarovskaya DCR in the diet of laying hens, which generally has a positive effect on the state of their body.
The aim of the studies was to conduct a veterinary-hygienic assessment of changes in the eggs productivity of laying hens, after the use of the “Prinarovskaya supplement of fish (DKR)” in their main diet, which is a homogeneous dry mass made from chilled river fish, by-products of fish processings, as well as grain products (wheat bran). The method of production of the additive in-cludes the following steps: grinding, cavita-tion heating and subsequent drying of the resulting mixture. The studied supplement contains a number of amino acids, vitamins and minerals, etc. The object of the study were laying hens of the LomannLsn-Classic breed at the age of 131 days. “Prinarovskaya DKR” were introduced into the diet of ex-perimental laying hens: of the 1st experi-mental group 8 g of “Prinarovskaya DKR” were introduced per 100 g of the main ration (RR); The 2nd experimental group - 6 g. DKR to main ration; 3rd experimental group - 4 g. DKR to main ration; the control group was fed only main ration - feed PK1-1G_1227 (GOST: R 51851-2001). A veteri-nary-hygienic assessment of the quality of eggs, obtained from laying hens, when feed-ing a new feed additive “Prinarovskaya” was carried out. We kept daily records of laid eggs by groups, the period of the beginning of oviposition. The egg production were calculated of the initial and middle laying hens , the egg production intensity for 120 days. To assess egg productivity, the weight of laid eggs, the egg mass for a certain peri-od of egg laying, and the feed costs per 10 laid eggs were determined. Organoleptic, physical, and chemical methods were used to evaluate egg quality. Egg mass is an important indicator of egg nutrition. GOST 31654-2012 "Food eggs. Technical conditions ”, as well as the requirements for chicken hatching eggs, the minimum weight of food and hatching eggs (45 g) is indicated, below which the imple-mentation and incubation of eggs is not rec-ommended [1]. In studies, the following indicators were taken into account: large and small diameter of eggs, egg density, egg shape index of laying hens of different groups. To assess the state of the internal contents of the egg after opening, the follow-ing indicators were taken into account: pro-tein mass, yolk mass, shell mass, egg vol-ume. An external examination of the eggs as-sessed the condition of the shell, the pres-ence of cracks, growths and depressions. The study indicates a positive effect of the feed additive "Prinarovskaya" on the egg produc-tivity of birds in all periods of egg laying
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