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Information × Registration Number 0225U005140, (0124U001301) , R & D reports Title To establish the peculiarities of productivity and resistance of cows with different parameters of  nervous regulation under conditions of climate change popup.stage_title Встановити особливості продуктивності та резистентності корів з різними параметрами нервової регуляції за умов зміни клімату Head Danchuk Oleksii V., Доктор ветеринарних наук Registration Date 26-12-2025 Organization Institute of climate smart agriculture of the national academy of agrarian sciences of Ukraine popup.description1 To establish metabolic markers of heat stress in lactating cows and to find out the peculiarities of nervous regulation stress resistance, productivity and adaptability to climate change popup.description2 An increase in THI from “moderate” (73–80) to “severe” (81–85) levels causes a significant and cumulative drop in milk yields; high-yielding cows react most sharply. Against the background of chronic heat stress, the physicochemical properties of milk change: the fat and protein content decreases, and the density increases; the most sensitive indicator was found to be the proportion of butyric acid (C4:0), which monotonically decreases with increasing THI. A dimensionless thermal tolerance coefficient (CT = (C4:0/C4:0_ref) × (THI_ref/THI)) is proposed, which combines a biochemical marker of the mammary gland with a microclimatic index and provides an early, standardized risk assessment. Morphological and biochemical blood parameters confirm the systemic nature of stress: anemic changes, leukocytosis with a neutrophilic component, increased liver enzymes and CK, hypoalbuminemia, hypocalcemia/hypomagnesemia. The severity of changes depends on the productivity and parameters of nervous regulation: sympathicotonics and animals with a weak or unbalanced type of GNI are the most vulnerable; vagotonics and strong balanced ones are more resistant. In practice, this allows predicting the flow of raw milk based on meteorological indicators, promptly managing cooling/feeding and taking into account neurophysiological features in selection. Product Description popup.authors Antonik Iryna Ipolytovna Danchuk Viacheslav V. Oleksandr V. Kornyk Marharyta H. Chesak popup.nrat_date 2025-12-26 Close