Cultivation of bulls for meat when using lowdecaying feed products in their diets

Relevance. With a high intensity of growth of animals during the growing period and the initial fattening period, when there is a predominant accumulation of muscle mass, microbial protein and a low amount of non-degradable protein are not able to meet the needs of a growing organism in amino acids. To obtain high gains, it is necessary to increase the amount of metabolic amino acids due to the intake of undeveloped well-digested protein into the intestine.

Methods. Two periods of experiment were conducted on 3 groups of bulls (n = 3) during the growing and fattening period with different levels of degradation protein in the diets. The level of degradation protein was changed through the use of processed and unprocessed sunflower meal and was controlled by incubation methods in sacco, as well as by conducting balance experiments, monitoring microbial-enzymatic processes in the rumen and blood parameters.

Results. It was found that reducing the disintegration of crude protein by replacing part of the natural sunflower meal with processed provides a significant reduction in the ammonia content in the scar fluid from 9,73 мg / 100 ml to 9,0 during the growing period (p < 0,1) and from 16,8 mg / 100 ml to 13,2 during the fattening period (p < 0,05), due to which nitrogen excretion in urine decreased from 31,0 to 26,0 g/day (p < 0,05) and from 73,0 to 62,0 g/day (p < 0,05) and the average daily gain in body weight increased from 1300 to 1375 g/day (p < 0,05) in the corresponding periods.

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