[The protein-synthesizing function of the liver in dairy cows fed feed with the addition of various urea preparations and different doses of urea].
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. Wałczan--"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 Wałczan (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 Wałczan in the first place and Melwit in the second.
Kwiatkowski
T
T
Katedra i Klinika Chorób Wewnetrznych AR we Wrocławiu.
Pres
J
J
Bakowski
J
J
D000821:Animal Feed; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D003612:Dairying / Q000592:standards*; D005260:Female; D005526:Food, Formulated; D008099:Liver / Q000378:metabolism*; D008903:Minerals / Q000008:administration & dosage; D011044:Poland; D014176:Protein Biosynthesis; D013213:Starch / Q000008:administration & dosage; D014508:Urea / Q000008:administration & dosage*
D008903:Minerals; D014508:Urea; D013213:Starch
Czynność białkotwórcza watroby krów mlecznych zywionych pasza z dodatkiem róznych preparatów mocznikowych i zróznicowana dawka mocznika.