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Abstract
Our objective was to determine if blood urea nitrogen (BUN) is related to calculated
energy balance (EB) or a measure of tissue mobilization during the periparturient
period. Blood samples were collected from 41 cows with varying postpartum EB and analyzed
for BUN and nonesterified fatty acids (NEFA). The cows were fed the same diets throughout
the experimental period. Although there was no relationship between BUN and EB or
plasma NEFA at 2 wk prepartum and 1 wk postpartum, there was a relationship between
BUN and plasma NEFA at wk 2 postpartum, and there was a tendency for BUN to be related
with feed efficiency, BW, and postpartum BW loss at wk 2 postpartum. Although NEFA
alone predicted only 14% of the BUN variation, feed efficiency, BW, and BUN, collectively,
were reliable predictors of tissue mobilization in dairy cows in early lactation (R2 = 0.65).
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Copyright
© 2006 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
