20.500.12556/RUL-185475 Evaluating seasonal serum vitamin d levels and growth performance in pigs from organic farms Ocena sezonskih ravni vitamina D v serumu in rastne zmogljivosti pri prašičih z ekoloških kmetij Vitamin D is an essential micronutrient in pig production as it plays an important role in many physiological functions. The aim of this study was to determine serum vitamin D concentration and growth performance in pigs reared on organic farms in different seasons. A total of 109 Krškopolje pigs were selected for this study. Pigs were divided into three groups: low altitude outdoor group A (N = 39), high altitude outdoor group B (N = 36) and indoor group C (N = 34). Blood samples and body weights were collected seasonally in 2022 and 2023. Serum vitamin D levels peaked in summer for outdoor groups A (69.3 ±2.6 ng/ml) and B (65.3 ±4.4 ng/ml) and were the lowest in winter (group A 21.5 ±2.2, group B 35.2 ±2.5). Altitude had no significant effect on vitamin D levels except in winter (p<0.001). Housing type significantly influenced vitamin D levels in every season between groups B and C, and in spring, summer, and autumn between groups A and C. Pigs in the outdoor group A showed higher average final body weights (151.2 ±7.5 kg in 2022 and 146.8 ±3.8 kg in 2023) than those in group C (132.7 ±11.3 kg and 118.5 ±6.9 kg), though this should be interpreted cautiously given variability in initial weights. vitamin D serum concentrations pigs welfare organic farm growth performance true false true Angleški jezik Slovenski jezik Članek v reviji 2026-08-06 12:50:53 2026-08-06 12:51:01 2026-08-07 04:08:23 0000-00-00 00:00:00 2025 0 0 Str. 145-155 iss. 3 Vol. 62 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-01-01 636.09:616 2385-8761 10.26873/SVR-2202-2025 255874563 evaluating.pdf evaluating.pdf 1 6958CB9CFF7B534895C8EAEBB0EB8A6C c75f4e109ff716cbb7ec08a73b2ed7d7f1cfae495b61368c85e7a12f11369073 a3bc5d14-9184-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=244003 https://journals.uni-lj.si/slovetres/article/view/25028 1 6074f94c-9184-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=244001 Veterinarska fakulteta Slovenian veterinary research 0 0 0