Fermentation in the rumen and the effectiveness of the use of nutritious feed components when ruminant fermented feeds are included in the diet

The assessment of metabolic parameters in the rumen and the efficiency of the conversion of nutrient components of the feed when using fermented feed substrate (sunflower husk) in the diet of bull calves was carried out.

The study was performed using the in vivo method. The object of the study is Kazakh white-headed bull calves with chronic scar fistula, aged 11–12 months. Waste from oil processing enterprises was used as the test plant substrate — sunflower husk, subjected to mechanical grinding and fermentation in a bioreactor for 9 days, the level of VFA in the contents of the rumen was determined by gas chromatography. The chemical composition of the tested substrates was determined according to generally accepted methods and GOST standards. Continuous fermentation is characterized by the reuse of agro-industrial waste as feed products for farm animals. The correct choice of culture medium, substrate and cultivation modes improves the quality of feed products, in particular, an increase in protein by 2.8 g and a decrease in fiber by up to 20.5%, as well as an increase in the course of metabolic processes in the rumen, in particular, an increase in the total level of LDL by 30.8% and total nitrogen by 16.8%, which contributed to an increase in the digestibility of dry matter feed by 9.8% (p < 0.05), crude fiber by 18.4% (p <0.01) and crude ash by 4.7% (p < 0.05).

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