Author/Editor     Nemec, Marija; Zadnik, T; Jazbec, I
Title     Koncentracija acetona v vzrocih mleka iz bazena
Translated title     Acetone concentration in milk bulk samples
Type     članek
Source     Zb Vet Fak Univ Ljublj
Vol. and No.     Letnik 34, št. 1
Publication year     1997
Volume     str. 55-61
Language     slo
Abstract     1498 weekly milk bulk samples (30 farms with 642 cows) were examined on the acetone concentration with O'Moore's semiquantitative method in 1993 and 1994 by sistematic analyses of ilk from the bulk tank. There were 1345 (89,79 %) negative samples. 81 (5.41 %) weekly positive +- = up to 0,17 mmol/l) and 72 (4.81 %) positive (+ = 0.17-0.41 mmol/l) samples examined on the acetone concentration. Ketolactia is usually an indication that there is one more dairy cows in the cowshed with subclinical or clinical form of ketosis. With O'Moore's method we succeeded in tracing the acetone concentration in bulk milk sample of a concentration of as little as 7 % of milk from ketolactial dairy cows (++ = 0.42-1.7 mmol/l of the acetone in milk). Significant influence of the season was found on the acetone concentration, with a rise in ketolactia, especially in winter time. In winter time, positive or weekly positive reaction of milk on the acetone concentration was established successively, several times. The presence of the acetone in almost every dairy cow in the individual milk controls. By the analysis of fodder, it was discovered that the higher concentration of the acetone in milk was due to foddering dairy cows with grass silage which contained a higher concentration of butyric acid (0.2-1.07 %). The discovered ketosis is being classified into a group of nutritional or false ketoses. A weekly milk bulk control control was proven as a successful method for discoverting ketolactia in dairy cows. On the other hand it is also a good method for tracing too high concentration of butyric acid in grass silage.
Descriptors     MILK
ACETONE
VETERINARY MEDICINE
CATTLE