Trifković Julijana, Jovanović Ljubomir, Bošnjaković Dušan, Savić Đorđe, Stefanović Srđan, Krajišnik Tatjana, Sladojević Željko, Kirovski Danijela
Department of Animal Production and Veterinary Medicine, Faculty of Agriculture, University of East Sarajevo, East Sarajevo, Bosnia and Herzegovina.
Department of Physiology and Biochemistry, Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia.
Biol Trace Elem Res. 2022 May;200(5):2122-2134. doi: 10.1007/s12011-021-02834-8. Epub 2021 Jul 21.
This study examines the effect of season-related heat stress in dams on mineral status, and hematological profile of their calves. Ten Holstein dams (LowT group) were exposed to the 49-day-long period of low air temperature (5.2 ± 0.5 °C) and ten dams (HighT group) were exposed to a 53-day-long high air temperature (27.4 ± 0.4 °C). The dams' blood samples were taken one hour after parturition, while colostrum was sampled at 2, 14, and 26 h after calving. Ca, P, Mg, Na, K, Fe, Zn, Mn, and Se concentrations were significantly lower while Cu and Co concentrations were significantly higher at least in two examined colostrum sampling points in HighT group. Calf`s blood samples were taken before 1 colostrum intake, and on days 1, 2, 3, and 7 postnatal. Ca, P, Na, K, Fe, Cu, Zn, Mn, Se, and Co were significantly lower while concentration of Mg was significantly higher in calves that originated from HighT group at least at two examined sampling points. Season affected dam's blood mineral status but the pattern was not always the same as in calves, since Na, K, Cu, and Co were significantly higher in HighT group. Calves that originated from HighT group had significantly lower hemoglobin, hematocrit, MCV, MCH, and MPV values, as well as neutrophils and monocyte counts, while platelets, eosinophils, basophils, and lymphocyte counts were significantly higher. Season-related heat stress leads to a reduction of the most minerals in both dams' colostrum and calves' blood and certain minerals' deficiencies are linked to impaired calves' hematological adaptation.
本研究考察了奶牛季节性热应激对其矿物质状况及其犊牛血液学指标的影响。十头荷斯坦奶牛（低温组）暴露于为期49天的低温环境（5.2±0.5°C），十头奶牛（高温组）暴露于为期53天的高温环境（27.4±0.4°C）。在产后1小时采集奶牛的血样，同时在产犊后2、14和26小时采集初乳样本。在高温组至少两个检测的初乳采样点，钙、磷、镁、钠、钾、铁、锌、锰和硒的浓度显著降低，而铜和钴的浓度显著升高。在犊牛摄入初乳前、出生后第1、2、3和7天采集血样。至少在两个检测采样点，来自高温组的犊牛体内钙、磷、钠、钾、铁、铜、锌、锰、硒和钴的含量显著降低，而镁的含量显著升高。季节影响奶牛的血液矿物质状况，但模式并不总是与犊牛相同，因为高温组中钠、钾、铜和钴的含量显著更高。来自高温组的犊牛血红蛋白、血细胞比容、平均红细胞体积、平均红细胞血红蛋白含量和平均血小板体积值显著更低，中性粒细胞和单核细胞计数也更低，而血小板、嗜酸性粒细胞、嗜碱性粒细胞和淋巴细胞计数显著更高。与季节相关的热应激导致奶牛初乳和犊牛血液中大多数矿物质减少，某些矿物质缺乏与犊牛血液学适应性受损有关。
