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Relevance. Currently, contactless remote measurements of the parameters of the exterior of animals are of considerable interest in the field of breeding and genetics of cattle. They can reduce the risk of dangerous reactions of animals to stress and significantly reduce the time needed to get measurements. We offer a way to obtain information about the size of an animal in real time by obtaining an image using the Structure Sensor 3D depth sensor.Methods. Scientific experimental studies were conducted in 2018–2022 on Black-and-White cows in breeding enterprises of the Udmurt Republic (Russian Federation). The volume of the sample population of animals was about 2000 cows. The animals were evaluated from the 90th to the 150th day of lactation. We have selected the following measurements: height at the withers, chest depth, chest width, hips width, straight length of the hip area, straight length of the trunk, circumference of the cannon bone, length of the rump bone, depth in the lower back, width. These parameters most accurately characterize the dimensions (frame) and hip area of the animal.Results. The analysis of the obtained results indicates the validity of using the Structure Sensor 3D depth sensor as a priority method for obtaining animal measurements. A comparative analysis of contactless methods for obtaining measurements of cows shows that in approximately the same time, it is possible to obtain numerical values of up to 10 exterior parameters. Calibration is performed easily and quickly within 10–15 minutes. The use of the Structure Sensor 3D depth sensor eliminates inaccuracies of obtaining a silhouette, that arise due to the continuous movement of animals, and does not require the creation of a new technique for obtaining measurements of the body of animals that differ in age, size and live weight. Using Structure Sensor 3D, examples were obtained with an accuracy of 1 mm without causing stress in animals.

Relevance. Accurate monitoring of the live weight of animals provides important information about the state of health, the predicted age of removal from fattening and the timing of the sale of livestock. However, weighing animals at all stages is a time-consuming process, unsafe for livestock breeders; it also causes stress to livestock. To overcome these problems, it is necessary to create non-invasive weighing mechanisms. Based on the results of experimental studies, a method for determining live weight based on ultra-precise neural networks applied to deep images of animals has been developed.Methods. Scientific research was carried out in 2021–2022 in the KFH Lekomtsev M.M., Glazovsky district of the Udmurt Republic. The volume of the sample set of animals was 78 bulls raised for meat and 75 heifers raised for herd repairs. All animals were divided into three groups depending on their origin: group 1 — bulls (n = 27) and heifers (n = 25) of the Black-and-White breed; group 2 — bulls (n =25) and heifers (n = 25) of the Aberdeen-Angus breed; group 3 — crossbred bulls (n = 26) and heifers (n = 25) of the first generation, obtained by crossing Black-and-White cows with bulls-producers of the Aberdeen-Angus breed. The intensity of growth was studied by indicators of live weight and average daily gains. The animals were weighed on electronic scales. The exterior was evaluated according to the following measurements: height at the withers, straight trunk length, chest depth, chest width, width of loin at hips, width of loin at pin bones, straight hip length, circumference of cannon bone. Exterior parameters were determined by the method of processing images obtained using a depth sensor Structure Sensor 3D.Results. The biological regularity of the formation of the exterior-constitutional features of cattle in age dynamics and the close correlation between the parameters of the physique and the intensity of growth have been revealed, which give reason to believe that the calculated values of the body mass index (in heifers — 0.34–0.35, bulls — 0.28–0.29) can be used as coefficients for predicting the live weight of young animals, excluding at the same time laborious weighing process.

Etude experimentale des possibilites de renovation de cylindres pneumatiques uses par depot d'un revetement de tribopolymere solide contenant un liant sur la surface de travail, un traitement mecanique permettant de retrouver les proprietes geometriques requises.