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- W2017383756 abstract "Fractionation of ammonia N isotopes was tested in vitro as ruminal ammonia N was labeled by addition of 15N-ammonium sulfate enriched at 10.7 at.% (15N10) or 20.5 at.% (15N20) excess. Ruminal inoculum was obtained from a lactating dairy cow fed a 45% forage:55% concentrate diet (dry matter (DM) basis). Duplicate incubations were carried out for 6 h and vessels were sampled at 0, 1, 2, 4, and 6 h. Total and individual VFA, acetate to propionate ratio, and ammonia concentration did not differ (P>0.05) between treatments. The 15N-enrichment of bacterial N increased (P<0.001) with incubation time, but was not affected (P=0.36) by the degree of enrichment of the ammonium sulfate. However, at the latter incubation hours, 15N-enrichment of bacterial N was higher (P<0.05) for 15N20 than 15N10. The proportion of bacterial N originating from ammonia N was not affected (P=0.81) by the 15N source. At 15N-enrichment levels considerably higher than natural abundance, fractionation of N isotopes by ruminal bacteria is negligible and does not significantly affect the reliability of 15N as an N tracer in nutritional studies with ruminants." @default.
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- W2017383756 date "2002-09-01" @default.
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- W2017383756 title "Fractionation of ammonia nitrogen isotopes by ruminal bacteria in vitro" @default.
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