20.500.12556/RUL-166415 Effects of UV-B light exposure during automatic milking on vitamin D levels in Holstein Friesian cows research data underlying the article Vitamin D is essential for cattle and can be synthesized in the skin under ultraviolet irradiation. This study investigated the effects of narrow-band UV-B irradiation during automatic milking on blood vitamin D concentration and the influence of hair and black skin areas on cutaneous vitamin D synthesis in Holstein Friesian cows. Fifty-one cows were stratified by milk yield, days after calving, and percentage of black skin, then divided into three groups: shaved and irradiated (80 J/m²), unshaved and irradiated (129–305 J/m²), and a control group. A custom UV-B light (peak radiation at 295 nm) was installed in the milking robot. Blood 25-hydroxyvitamin D (25(OH)D) levels were measured at baseline, and 7, 30, and 60 days post-exposure using an enzyme-linked fluorescent assay. UV-B exposure significantly (p<0.001) increased 25(OH)D levels in shaved (13.4 ng/mL), unshaved (10 ng/mL), and control groups (5.1 ng/mL). Despite receiving less than half the UV-B dose, the shaved group had superior 25(OH)D synthesis compared to the unshaved group (p<0.05), highlighting hair's role in reducing UV-B absorption. Cutaneous synthesis correlated with black skin area in shaved cows but not in unshaved cows. UV-B irradiation also increased daily milk production by 2.2 kg (shaved) and 2.9 kg (unshaved) compared to controls (p<0.001). UV-B exposure during automatic milking offers a novel, non-disruptive method for enhancing vitamin D levels in dairy cows. ultraviolet-B light cattle 25-hydroxyvitamin D milk yield skin hair color ultravijolična B svetloba govedo 25-hidroksivitamin D prireja mleka koža dlaka barva true false false Angleški jezik Slovenski jezik Neznano 2025-01-10 12:35:02 2025-01-10 12:35:06 2026-03-02 15:20:06 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 Methodology_for_UV_repoz.docx Methodology_for_UV_repoz.docx README 1 F70F6D8C303E5BBF4694C0DE7287CC48 ad93522b54eb71d01e8718208517ec7eebccacf2acedcf8211cd1a120edf5904 bd07670c-cf4a-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198028 Data_cows_blood_repoz.xlsx Data_cows_blood_repoz.xlsx Data on cows and their blood tests 1 3260B3010B054DF47BAF79BEB61D7F64 152a112a30355387d5030b9b8f9a0040158302fd1128351dbb853cc8b1b16a89 d1e696af-cf4a-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198029 Milk_quantity_and_caracteristics_repoz.xlsx Milk_quantity_and_caracteristics_repoz.xlsx Milk quantity and characteristics 1 4477B07DF6C9DEC9AEEC36EBCE959DC9 156287b6ba87b9b04f85c390cd71e8ed51f0220db05bec1ef4724049e81b17bc dacce383-cf4a-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198030 Veterinarska fakulteta Meritve in testi 0 0 0