Exchange of protein and nitrogen compounds in the bulls when feeding cellulose-contained feed
DOI:
https://doi.org/10.32636/01308521.2021-(70)-2-12Keywords:
bulls, blood serum, fiber-containing feed, protein, transamination enzymesAbstract
Metabolic processes in the body of cattle, in particular in the digestive tract of bulls, when feeding young grass, feed and various forms of fiber-containing feed during the spring-summer transition period are poorly understood. Young grass at this time contains a large amount of nitrogen-containing compounds, but very little readily available sugars and fiber. The content of the latter in the young grass of pastures and meadows, instead of the required for cattle 22-24% of dry matter, is only 15-18%. In addition, the fiber of young grass has very little of its structured form (associated with lignin and hemicellulose). This leads to the fact that cattle do not fully use the nitrogen available in the young grass.
In the course of research we studied changes in the concentration of protein, residual and total nitrogen, urea, as well as the activity of transamination enzymes in whole blood of bulls depending on the time relative to the beginning of feeding and the presence in the diet of various forms of fiber.
It is shown that the activity of transamination enzymes (AST and ALT) under the action of various forms of fiber-containing food before morning feeding increases by 5,1–7,5 % compared to control. This increase does not depend on the time relative to the start of feeding. It is suggested that the activity of transamination enzymes in the whole blood of bulls when feeding them fiber-containing feed is substrate regulated.
According to research, it can be argued that the activity of reamination enzymes in the blood serum of bulls during the feeding of fiber-containing feed before morning feeding increases by 6,4–8,5 % compared to control. The concentration of protein in the blood serum of bulls, regardless of the time relative to the beginning of feeding, with the feeding of various forms of fiber-containing feed increases by 4,2–6,1 % compared to control. The content of urea and residual nitrogen in the whole blood of bulls at 3 hours from the beginning of morning feeding decreases by 6,3–8,9 %, and protein and total nitrogen – increases compared to control.
It is also shown that weight gain depends on the level of nitrogen-containing compounds and the activity of transamination enzymes in the blood serum of experimental bulls.
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