[Studies on the effect of phosphoric phenyl ester diamide as inhibitor of rumen urease in dairy cows. 3. Digestibility of the nutrients and bacterial protein synthesis].
Two lactating cows with duodenal re-entrance cannulae were fed with rations containing 180g urea (A) resp. urea modified with the urase inhibitor phosphoric phenyl ester diamide (PPD, 1 g PPD/100 g N). The cows, accustomed to urea, were not adapted to PPD (B) resp. had been adapted to PPD for 30 days (C). From A to C the digestibility of the organic matter in the stomachs amounted to 52, 47 and 52% and in the total tract to 78, 77 and 79%; the digestibility of crude cellulose amounted to 64, 50 and 62% resp. 69, 64 and 68% and that of starch to 91, 87 and 95% resp. 100% in each case. 71, 66 and 70% of the N were digested. The passage rate of N in the duodenum was 90, 102 and 106% of the N-intake. In the intestines 61, 68 and 76% of the N-intake were absorbed. The passage of bacteria-N in the duodenum was 67, 92 and 71% of the N-intake, that of the sum of NH3- and urea-N 6,8 and 8%. The conclusion is that, with unchanged digestibility of darbydrates, the N-supply of cows should be improved by the modification of urea with PPD after the adaptation of the cows. Cellulose fermentation is inhibited at the beginning of the adaptation to PPD.
D000821:Animal Feed; D000818:Animals; D001426:Bacterial Proteins / Q000096:biosynthesis; D002417:Cattle / Q000378:metabolism*; D003612:Dairying; D004063:Digestion; D004386:Duodenum / Q000187:drug effects / Q000378:metabolism; D010755:Organophosphates / Q000494:pharmacology*; D009943:Organophosphorus Compounds / Q000494:pharmacology*; D012417:Rumen / Q000201:enzymology; D014510:Urease / Q000378:metabolism
D001426:Bacterial Proteins; D010755:Organophosphates; D009943:Organophosphorus Compounds; C032022:phosphoric phenyl ester diamide; D014510:Urease
Untersuchungen zur Wirkung von Phosphorsäurephenylester-diamid als Inhibitor der Pansenurease bei der Milchkuh. 3. Mittteilung: Verdaulichkeit der Nährstoffe und bakterielle Proteinsynthese.