Abstract
The main limiting factor in the consumption by ruminants of large quantities of bulk feed is the presence of fiber in plants, an increase in which above the optimal level has a negative impact on digestion, leading to a decrease in the digestibility of nutrients in the diet. By changing the structure of the diet and the ratio of nutrients in the diet, it is possible to stimulate or inhibit both the general nature of rumen processes and the level of nutrient utilization. This article presents the materials of the work aimed at studying the effect of different content of neutral detergent and acid detergent fiber in the diet of animals during the first phase of lactation on ruminal digestion.
 Studies showed that feeding cows of control and experimental groups in the first 100 days of lactation with diets with different content of structural carbohydrates predetermined some changes in the microbiological and enzymatic activity of ruminal digestion.
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