## 2 Materials and Methods  
The study was conducted by analyzing the available statistical data obtained in the course of practical studies conducted in real conditions in 5 large farms: \"Ecocorm\" Ltd. (Voronezh region, Russia), \"Research Center of Traditional Technologies\" Ltd. (Ivanovo region, Russia), Agricultural enterprise \"Novomarkovskoye\" Ltd. (Voronezh region, Russia), Agricultural enterprise \"Voshchazhnikovo\" Ltd. (Yaroslavl region, Russia). Thirty-seven heads of cattle were examined for 30 days with a measurement interval of 60 s. The cows' selection for the examination was carried out in accordance with the following criteria: all cows were of the same breed (specifically, the Holstein breed), they were kept in the same conditions, and received the same unified diet. They were aged 2 or 3 years; all of them had their lactation period of 3 to 5 months, and their weight was at least 350 kg. Their average milk yield at the peak lactation was 30 (\(\pm\)3) kg/day. Their daily diet consisted of alfalfa hay (2.5 kg), corn silage (16.0 kg), alfalfa hay (12.0 kg), propylene glycol (0.2 kg), glycerin (0.15 kg), and compound feeds (8.78 kg). Prior to the start of the study, the selected cows were examined in accordance with the common clinical examination procedure [5]. The clinical study used an algorithm involving the following sequential steps: anamnesis of the studied animals, their identification, habitus determination, examination of wool and skin, examination of visible mucous membranes, measurement of body temperature, palpation, auscultation, percussion and live weight measurement. The average body weight of the studied cows was 517 (\(\pm\)2.03) kg. No clinical signs of disease were found in the first group. For inclusion into the second group, 23 cows were selected with parameters similar to those of the cows in the first group but with the presence of some clinical signs of diseases such as encephalomyelitisitis, infectious enteritis, and hypothermia. In animals belonging in the second group, 3 groups of diseases were observed, namely, nervous, infectious, and parasitic diseases. The diseases of the nervous system include encephalitis, encephalomyelitisitis, and meningitis. Among the infectious diseases, the following ones were considered: brucellosis, infectious nodular dermatitis, and tuberculosis. As parasitic diseases, we evaluated hypodermatosis, cysticercosis and dictyocauslosis. The input data were the measurements readings of the indicators of cattle health (pH level, rumen temperature, and locomotive activity). This preliminary data were obtained using the internal monitoring system prior to the main data collection. The measurements were carried out using sensors entered orally. Besides, microclimate parameters were measured, such as relative humidity and air temperature in the cowshed. Data monitoring was conducted via a radio transmitter on the ISM band (433 MHz). The combined database of cattle locomotive activity, pH level, and rumen temperature was transmitted via the basic station and then via a GSM module or Ethernet cable to the server. The microclimate in the premises, where healthy cows of the first group were kept, was within the normal range (humidity 70-85%, temperature 10-20 \({}^{\circ}\)C). Deviations were observed within acceptable limits of the values (humidity 5-7%, temperature 3-10 \({}^{\circ}\)C). Meanwhile, in the parameters of the microclimate in the rooms where the sick cows were kept, deviations from the norms were periodically observed (humidity below 50%, tem-perature above 25 \({}^{\circ}\)C). The measurement accuracy of the sensors was checked with the use of samples of the rumen content taken from fishtaled cows. These samples were examined in our laboratory by veterinarians with the use of the standard stationary measuring devices. It was found that the deviations in the measured parameters were statistically insignificant (not exceeding 0.05).