Application of milk acetone determination in the monitoring of cattle herds

In the period of December 1996 to December 1997 seven dairy farms have been monitored in monthly intervals. Milk samples were taken from all animals w ithin the first eight weeks p.p. (n = 15.605) and the acetone concentration s were determined with the flow injection analysis technique (FIA). Within the first two weeks p.p. are 59 per cent (n = 352) of animals with elevated concentrations (> 0,250 mmol/l). 82,7 per cent (n = 291) of these animals have values of subclinical ketosis. Within the first six weeks of lactation 97 per cent (n = 578) of all individuals exhibited augmented milk acetone concentrations. Both high and fluctuating shares of animals with high milk acetone concentrations have negative effects on the average milk production within a herd. During the winter period low rates of sick animals were fou nd, whereas in May and August a maximum frequency was detected. The applica tion of milk acetone determination in the monitoring of cattle herds facili tates a reliable and permanent control of the energy metabolism of dairy co ws. Problems concerning the energy supply can be detected and the effect of countermeasures can be monitored with low efforts.