There was a linear trend of increased ruminal fluidammonia-N and BUN with increasing dietary CPconcentration. Cows consuming the 14.4% CP diet hadhigher (p<0.05) ruminal fluid ammonia-N and BUNconcentration than cows eating the lower CP concentrationdiets both before and 4 hours after feeding. Four hours post-lowers in CP. Milk urea nitrogen results mirrored theammonia-N and BUN results.Relationship between concentration of ruminalammonia N (NH3-N) blood urea and nitrogen (BUN) in midlactatingdairy cows fed with total mixed rations varying in crudeprotein concentration.
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