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Proteins are one of the most important indicators of blood. More than 150 individual whey proteins are currently known. However, an idea of the protein spectrum of blood can also be obtained on the basis of the concentration of total protein, albumin, globulins, the value of the protein coefficient, and the nature of their ratio gives an idea of the direction of protein metabolism (anabolic or catabolic), since the specificity of metabolic processes determines the productivity of layers. The concentration of total protein in the blood of chickens did not depend on the age of the bird, namely the period of the reproductive period, and hence the level of egg production. It fluctuated at the level of 37.2-42.0 g / l. Albumin concentration significantly increased during oviposition from 17.51 ± 1.71 to 21.36 ± 2.09 g / L. At the same time, the percentage of albumin in the total protein concentration increased from 47.07 ± 1.27 (26 weeks of age) to 53.93 ± 1.33% (p≤0.05) (80 weeks of age). The amount of globulins in the blood of hens did not depend on the age and duration of the reproductive period, but had a tendency to decrease, which was the result of a gradual decrease in the defenses of the bird’s body. The resistance of the body of laying hens decreases to the greatest extent at the age of 80 weeks, which causes an increase in Alb / Gl - coefficient by 1.51 times (p≤0.05) compared to the beginning of oviposition. The concentration of urea in the body of hens steadily increased during oviposition from 2.76 ± 0.18 (26 weeks of age) to 4.03 ± 0.11 mmol / L (p≤0.05) (80 weeks of age). The uric acid content in the blood of laying hens did not depend on the age and duration of the reproductive period and varied in the range of 0.39 ± 0.007 - 0.43 ± 0.002 mmol / L.

Age-related variability of indicators of protein metabolism in the blood of laying hens