A possible role of endotoxins in spontaneous paretic cows around parturition.

Six late pregnant old cows which had a history of parturient paresis were studied with respect to clinical and blood biochemical changes during two weeks before and after parturition. The levels of serum endotoxin were evaluated during two days before and after parturition. Three out of six animals showed signs of paresis and two animals needed treatment. The clinical and general changes of all parameters supported the idea that during parturient paresis and parturition, there is absorption of endotoxins from the gastro-intestinal tract. Most of the studied parameters changed similarly to what has been described in experimentally induced endotoxaemia. The animals showed signs of ruminal stasis, had an increase in body temperature, prostaglandin metabolite and endotoxin as well as a decrease in serum calcium, zinc, iron and bile acids levels. The changes of these parameters were also closely related to each other. Furthermore, the changes were more pronounced in paretic cows. Endotoxins absorbed from the gastro-intestinal tract can be involved in paresis and make the outcome of this disease more severe.