Bìol. Tvarin, 2016, vol. 18, no. 1, pp. 99–104
CONTENT OF AMINO ACIDS IN THE RUMEN OF COWS UNDER CONDITIONS OF FEEDING HIGH-PROTEIN EXTRUDED SUPPLEMENTS
I. V. Nevostruyeva
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Institute of Animal Biology NAAS,
38 V. Stus str, Lviv 79034, Ukraine
Increase in the quantity of undegradable in the rumen proteins in the diet of cows of experimental group caused by extruding of high-protein supplements was accompanied by the change of total and free amino acids in ruminal contents. The amount of total amino acids in the rumen of cows of experimental group during all experiments was greater by 9.8–10.8 %, which was mostly caused by the increase of the amount of essential amino acids (Р<0.05–0.01). Irrespective of the source of protected proteins during all experiments in the rumen of cows in experimental group, the increase of the concentration of lysine, arginine, methionine, proline and cystine was determined (Р<0.05–0.01), while feeding rapeseed and soybean meal — increase of the concentration of valine, threonine and phenylalanine as well, and while feeding sunflower cake — increase of the concentration of leucine. Among nonessential amino acids in the rumen of cows in the experimental groups, the amount of asparaginic acid, serine, and alanine was increasing (Р<0.05–0.01).
As opposed to total amino acids, concentration of free amino acids in the ruminal contents of cows of experimental group was smaller by 14.8–18.0 % (Р<0.05) compared to animals of control group that was mainly caused by decrease of the concentration of essential amino acids — histidine, methionine, and leucine. Considering nonessential amino acids, at the same time, concentration of glutaminic acid and asparaginic acid, glycine, proline, serine, and tyrosine has decreased (Р<0.05–0.01). These data are the evidence of decrease of degradability of essential amino acids and of increase of their intake into bowel, and uptake by cows.
Keywords: COWS, RUMEN CONTENTS, AMINO ACIDS, RAPESEED MEAL, SOYBEAN MEAL, SUNFLOWER CAKE, EXTRUDED FODDER, LACTATION
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