Keywords: piglets, amino acids, metabolic energy, protein metabolism, compound feed, productivity, safety
Data about the influence of most limiting essential amino acids (lysine, methionine, threonine) and metabolic energy (ME), provided that their level in the diet increases on the growth and content of total protein, urea and uric acid in the blood plasma of piglets are presented in the article. The stimulatory influence of these additions to the piglets’ diet on the growth and protein metabolism in their body was shown. The positive effect of the introduction of essential amino acids (lysine, methionine and threonine) and sunflower oil to the diet on the taste of the mixed feed, the intensity of its eating and the growth of piglets was shown in the conducted research. The greatest gains in piglets of the 4th experimental group, where the level of ME in the diet was 13.72 MJ, lysine – 13.8 g / kg, methionine and threonine – 9.2 g / kg of the mixed feed were observed. At the same time, the safety of piglets was directly proportional to their average daily gain. The highest it was in piglets of the 4th experimental group (96.7%), and the lowest in the control group (89.7%). The increase of the content of lysine, methionine, threonine and fat in the piglets’ diet led to an increase in the blood plasma of proteins level and a decrease of urea and uric acid. A clear tendency to increased total protein concentration in blood, when increasing the intensity of pre-starter mixed feed intake by piglets with the additional introduction of lysine, methionine, threonine and sunflower oil was observed. It follows from these data that if the level of the most limiting essential amino acids (lysine, methionine and threonine) increases in the diet, the synthesis of blood plasma proteins in the liver of piglets increases and this process is stimulated by the addition of fat. At the same time, feeding young piglets with amino acid and fat additions contributed to a decrease in the content of urea and uric acid in blood plasma. A significant influence of the investigated factors on the use of amino acids and metabolic energy in energy processes in the animal body indicated.
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