Novel method in diagnostics of illnesses and an estimation of the physiology-biochemical status of an organism is the measurement of a dynamic surface tension (DST) of serum of blood. DST has a number of features for horses of a different sex, age and breed. The stallions of different breeds have changes in different ages, that have features in 7-8 years. The most specifi c indicator of breed and age is the initial and fi nal slope of the tensiogram, that can be used in practice for express-control of age and breed of horses for blood samples. The highest values of surface tension for short times the existence of the surface for some groups of animals that may be associated with a particular ratio of components (proteins, lipids, salts, etc.) in the serum.

Interfacial tensiometry is a new integrated method of an estimation of the physiological-biochemical status of an organism of animals. As example, the measurements of the dynamic surface tension of pig's serum have a number of features which are important for application in farm pig breeding.