[Selected factors of metabolism in ruminants fed with increasing doses of urea in the food. I. Liver function in cows in the light of the activity of selected enzymes and the levels of indicators of protein metabolism]. / Badanie wybranych skladników przemiany materii u przezuwaczy zywionych wzrastajacymi dawkami mocznika w paszy. I. Wydolnosc watroby krów w swietle aktywnosci wybranych enzymów i poziomu wskazników przemiany bialkowej.

The authors studied the influence of urea added to diet in an amount of 150 grams daily per 1 cow on the function of the liver by means of: determination of the activity of the following enzymes: arginase, ornithin-carbamyl-transferase, leucyloaminopeptidase, gamma-glutamyl-transferase, phosphatase alkaline, determination of the level of total protein, albumins and globulins, urea, sodium and potassium in the serum of dairy cows. No significant changes were found in the activity and in the content of the above mentioned blood constituents. The dose of 150 grams of urea added to diet did not show any disturbances in protein metabolism in the liver and in the health of the cows.

[The protein-synthesizing function of the liver in dairy cows fed feed with the addition of various urea preparations and different doses of urea]. / Czynnosc bialkotwórcza watroby krów mlecznych zywionych pasza z dodatkiem róznych preparatów mocznikowych i zróznicowana dawka mocznika.

It was compared the effect of different preparations containing urea on the productivity and on the blood content of the biochemical compounds informing about protein synthesis activity in the liver of milk cows. The following preparations were added alternatively to the food to 28 cows in a quantity equal with 150 Gm in the first year and with 200 Gm of pure urea in the second year of experimentation for cow and for day: 1. Melwit--a liquid food supplementation containing 5 per cent of urea, 2. Walczan--"Sterea"-like preparation with 30 p.c. of urea, 3. Ekstruder--"Golden-Pro"-like preparation with 20 p.c. of urea and 4. BW preparation (concentration) for dairy cows containing only plant protein, without urea. In the plasma of all animals was observed the increase of urea, total protein and albumin content and of the activity of following enzymes: AP, AAP, Arg, LAP, AspAT and of A1AT. The content of total and of direct bilirubin in plasma did not change significantly. All examined compounds did not exceed the physiological range. The greatest changes were observed after feeding with Extruder. The physiological decline of milk production after calving was smallest in group fed with Walczan (2.4 litres) and greatest in Ekstruder group (4.4 litres) when in Melwit 3.4 and in BW 3.5 litres was noticed. The authors stated that the most suitable form of preparation containing urea was Walczan in the first place and Melwit in the second.

The study of heptenophos and triazophos residues in vegetables treated with the organophosphorus insecticides Hostaquick and Hostathion.

The residues of heptenophos and triazophos (active components of Hostaquick and Hostathion) were determined in several vegetable crops during the growing period. Heptenophos residues decreased below the limit of detection (0.001 mg/kg) in most of the crops one week after the treatment. However, the decline of triazophos in vegetables below the limit of detection (0.002 mg/kg) depended on the method of crop treatment.

Residues of cycloate and influence of herbicides on some of nutritional factors in spinach.

The influence of cycloate (active component of Ro-Neet 6E) on the biological value and residues in spinach was studied. During the growing season of spinach, cycloate residues decreased rapidly until by harvest time levels 0.0005--0.0008 mg/kg. had been reached. None of the studied herbicides had negative influence on the chemical composition of spinach.