Konferenču materiālu krājumi (ASI) / Abstracts and Proceedings

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    Atomic physics, optical technologies and medical physics, 10-11.02.2022.,Riga
    (LU Atomfizikas un spektroskopijas institūts, 2022-02-24) 80th scientific conference at the University of Latvia
    80th International Scientific Conference of the University of Latvia Section ‘Atomic physics, optical technologies and medical physics’ will be held by Institute of Atomic Physics and Spectroscopy (IAPS) on 10-11.02.2022. The section will present the recent results, achieved by IAPS researchers and the IAPS partners in the following research fields: optical phenomena in gas, liquid, solid state and biological samples, optical methods for diagnostics, chemical analysis and optical sensor technologies, quantum optics and telecommunication, modelling, novel nanomaterials and their biomedical applications. Total 27 abstracts.
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    Photoplethysmography for bovine heat detection: the preliminary results
    (International Society for Optics and Photonics (SPIE), 2020-02-14) Cugmas, Blaž; Plavšić, Aleksandar; Štruc, Eva; Spīgulis, Jānis
    In this study, we applied photoplethysmography (PPG) as an alternative, convenient, and affordable method for bovine heat detection. Heat detection is an essential part of effective herd reproduction management. Currently, there are many different heat detection techniques, but they can be ineffective or impractical to use. Since heat affects local vulvar blood circulation (resulting in swelling and erythema), photoplethysmography could represent an affordable alternative to detect this bovine phenomenon. In this study, we enrolled 20 animals in heat and other stages of the bovine reproduction cycle. We analyzed the PPG signal in terms of baseline (DC component), power, kurtosis, and erythema index. One vaginal measurement site, approximately 8 cm from the vulva, exhibited significant differences in mucous color (PPG green and red baseline, both erythema indices). What is more, cows in heat displayed higher PPG signal power and kurtosis, but differences were not significant. Photoplethysmography exhibited the potential to detect bovine heat.