Effects of UV-B light exposure during automatic milking on vitamin D levels in Holstein Friesian cows

Hodnik, Jaka Jakob (avtor), Jankovec, Marko (avtor), Ježek, Jožica (avtor), Krušič, Žiga (avtor), Mitterhofer, Stefan (avtor), Starič, Jože (avtor)

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 postexposure 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.

• Jezik: Angleški jezik
• Ključne besede: ultraviolet-B light, cattle, 25-hydroxyvitamin D, milk yield skin, skin, hair, color, blood
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: VF - Veterinarska fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Datum objave: 01.01.2025
• Leto izida: 2025
• Št. strani: 8 str.
• Številčenje: Vol. 11, [article no.] 1433230
• PID: 20.500.12556/RUL-166711
• UDK: 636.2.09:616
• ISSN pri članku: 2297-1769
• DOI: 10.3389/fvets.2024.1433230
• COBISS.SI-ID: 223240707
• Datum objave v RUL: 22.01.2025

Gradivo je del revije

• Naslov: Frontiers in veterinary science
• Skrajšan naslov: Front. vet. sci.
• Založnik: Frontiers Media S.A.
• ISSN: 2297-1769
• COBISS.SI-ID: 3969402

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Program financ.: P4-0092
• Številka projekta: P4-0092
• Naslov: Zdravje živali, okolje in varna hrana