with the milk composition above, there was a similar trend
in BUN concentrations for cows fed PCU and SBM diets to
MUN concentration. Cows consuming the FGU diet had the
highest concentration of BUN (p = 0.05). In a similar study,
Casper and Schingoethe (1986) reported that urea
supplement led to higher serum urea concentration than
soybean meal because of its rapid hydrolysis to ammonia in
the rumen. Based on the BUN and MUN concentrations in
the present study, we could deduce that more urea should be
formed in the liver and then excreted in urine for the cows
consuming the FGU diet than other diets. This explanation
may partly account for higher milk protein content for cows
fed PCU or SBM diets than the FGU diet. Furthermore, we
also found a strong positive correlation between BUN and
MUN (r2
= 0.85, data not shown). This is in accordance
with other reports in which MUN concentration was highly
correlated with BUN concentration (Broderick and Clayton,
1997; Kauffman, 2001).
with the milk composition above, there was a similar trend
in BUN concentrations for cows fed PCU and SBM diets to
MUN concentration. Cows consuming the FGU diet had the
highest concentration of BUN (p = 0.05). In a similar study,
Casper and Schingoethe (1986) reported that urea
supplement led to higher serum urea concentration than
soybean meal because of its rapid hydrolysis to ammonia in
the rumen. Based on the BUN and MUN concentrations in
the present study, we could deduce that more urea should be
formed in the liver and then excreted in urine for the cows
consuming the FGU diet than other diets. This explanation
may partly account for higher milk protein content for cows
fed PCU or SBM diets than the FGU diet. Furthermore, we
also found a strong positive correlation between BUN and
MUN (r2
= 0.85, data not shown). This is in accordance
with other reports in which MUN concentration was highly
correlated with BUN concentration (Broderick and Clayton,
1997; Kauffman, 2001).
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