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The article presents a study that aims to measure the concentration of lymphocyte muscarinic receptors (MR), platelet α2-adrenergic receptors and blood monoamine levels in ageing dogs. The study used 27 healthy dogs of both sexes divided into two groups: adults and old dogs. Blood samples were collected and the plasma catecholamines and serum serotonin was measured. The results suggest that both MR and serotonin levels represent appropriate marker of ageing in dogs.

The article focuses on a study that analyzes the effects of herbal extracts on blood prostaglandins, leukotrienes and thromboxanes in the horse. For this study, seventeen horses, with an average age of 14.1 years and medium heart girth of 188 cm, were used. The results of the study indicates that there are no differences in the serum concentrations of blood prostaglandins, leukotrienes and thromboxanes between horses with chronical inflammatory process and healthy horses.