Abstract
The objectives of this study were to measure within day variation and day-to-day variation in selected metabolites in serum and milk samples obtained from animals in a herd of 20 Holstein-Friesian cows which grazed ryegrass/white clover pastures during peak lactation in October. In the first trial, the 20 cows were milk and blood sampled at 0630 h, 1030 h and 1430 h on 3 October and at 0630 h on the following day. Average metabolite concentrations in serum were within the ranges indicated by a regional laboratory as being normal for healthy cattle, but significant differences were associated with sampling time and among individual animals within this range. Blood and milk urea nitrogen (BUN and MUN) and blood beta hydroxybutyrate (BOH) concentrations increased by 1.82
Proceedings of the New Zealand Society of Animal Production, Volume 53, , 33-36, 1993
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