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- W2081898405 abstract "In a series of in vitro incubations with sheep rumen fluid, the effect of additives on the degradation of casein and casein hydrolysate and on microbial growth was investigated. The following additives were tested: the antibiotics (20 ppm) Thiopeptin, Siomycin, Terramycin, Aureomycin, Monensin, Lasalocid, Salinomycin, Avoparcin, Novobiocin, Capreomycin, Flavomycin, Virginiamycin, Bacitracin, the deaminase inhibitor diphenyldimethyliodoniumchloride (DDIC) and finally Sarsaponin (50 ppm). The rumen microbes were not adapted to the additives, as these were not fed to the sheep. Disappearance of casein and the production of ammonia and volatile fatty acids (VFA) were used as criteria for the degradation of protein or free amino acids, while total and net microbial growth were determined, respectively, by 32P incorporation in microbes and the decrease in the extracellular ammonia pool during incubation. All additives, except Siomycin, Novobiocin, Capreomycin, Flavomycin and Sarsaponin, lowered casein and casein hydrolysate degradation, showing inhibition of both protease and deaminase reactions. Ionophores and deaminase inhibitor were the most active in this respect. The presence of carbohydrates in these incubations did not alter the effects on protein breakdown. Free amino acids as substrate were degraded at a faster rate than casein, suggesting that proteolysis was the rate-limiting step in protein breakdown in the rumen. Also, the fermentation pattern of the free amino acids was rather different from that of the corresponding protein, suggesting unknown effects of non-physiological amounts of free amino acids in the rumen, for which some speculation, based on stoichiometric considerations, is made in the discussion section. Most additives had no effect on VFA production in incubations with cellobiose-maltose as substrate, but the efficiency of microbial growth was lowered with Novobiocin, Bacitracin, Terramycin, Avoparcin, ionophores and deaminase inhibitor. The results showed that potent additives were not very selective in their influence on the different nitrogen transactions in the rumen in vitro." @default.
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- W2081898405 date "1990-12-01" @default.
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- W2081898405 title "Effect of antibiotics, a deaminase inhibitor and Sarsaponin on nitrogen metabolism of rumen contents in vitro" @default.
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- W2081898405 doi "https://doi.org/10.1016/0377-8401(90)90137-w" @default.
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