Polyetiology of neonatal gastroenteritis in calves

The work was carried out at the Department of «Animal Diseases and VSE» of the Saratov State Agrarian University named after N.I. Vavilov, as well as in JSC «Meliorator» and JSC «Trudovaya»of the Marksovsky district of the Saratov region. The effect of insufficient feeding on the level of amino acids in the blood and colostrum and the effect of these factors on the incidence of diarrhea in calves has been established. With less complete and monotonous feeding (below the norm of feed units by 8.2 %o, digestible protein by 44.2 %, calcium by 15.5 % and phosphorus by 50.9 %), there is a significant decrease in lysine, serine, alanine, tryptophan, methionine, valine, phenylalanine, leucine+ isoleucine, threonine, cystine+cysteine, arginine, histidine and tyrosine, and the amount of glycine, aspartic acid and glutamic acid decreases by a statistically unreliable amount. In cows that were in the stable period on a more complete feed diet, the content of free amino acids in the blood is lower in the month before calving by an average of 6.8 % and immediately after calving by 11.1 % than in the blood of cows 5-7 months before calving. In animals that were in the stable period on a less complete feed diet, the content of free amino acids in the blood is lower by an average of 18.4 % a month before calving and by 30 % immediately after calving than in the blood of cows 5-7 months before calving. The content of free amino acids in the blood of cows of the farm «prosperous» for diarrhea is higher than in the blood of cows of the farm «dysfunctional» for the disease.