title: [The effect of zeolite (clinoptilolite) on the post-feeding dynamics of N metabolism in the portal vein, jugular vein and the rumen fluid of bulls].
abstract: If easily digestible saccharides are deficient in the feed ration of bulls with the live weight of 300 kg and at simultaneous single application of urea at a rate of 0.2 g per 1 kg live weight, zeolite (with 50.6% clinoptilolite content) administered at a rate of 2.5% per 1 kg dry matter influenced significantly (P less than 0.05) the ammonia concentration in rumen, v. portae and v. jugularis. The rumen contents and blood were sampled at the intervals of 0, 15, 30, 60, 90, 120, 180 and 360 minutes after feeding. Basal feed ration consisted of 1 kg feed mixture and 3 kg meadow hay. After urea administration, zeolite reduced the ammonia concentration in rumen by 20-40% in comparison with the control group and in v. portae by 60-70%. In v. jugularis in the 90th minute after feeding significant hyperammonemia was observed in bulls with no zeolite supplement. Zeolite administration did not influence urea concentration in plasma.
mesh_terms: D000538:Aluminum Silicates / Q000494:pharmacology*; D000641:Ammonia / Q000097:blood / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D008297:Male; D012417:Rumen / Q000378:metabolism; D014508:Urea / Q000097:blood / Q000378:metabolism*; D017641:Zeolites
chemical_list: D000538:Aluminum Silicates; D017641:Zeolites; D000641:Ammonia; D014508:Urea
vernacular_title: Stúdium vplyvu zeolitu (klinoptilolitu) na dynamiku niektorých ukazovatel'ov N-metabolizmu po nakŕmení vo v. port ae, v. jugularis a v bachorovej tekutine u býkov.