20.500.12556/RUL-175531 Vpliv vročinskega stresa na vsebnost hlapnih maščobnih kislin ter morfometrične in histopatološke lastnosti prebavil pitovnih piščancev magistrsko delo The effect of heat stress on the volatile fatty acid content and morphometric and histopathological properties of the digestive tract in broiler chickens M. Sc. thesis Temperatura okolja je eden ključnih dejavnikov, ki vpliva na dobrobit živali. Vročinski stres, ki nastane ob previsokih temperaturah, negativno vpliva na rast, zauživanje krme, presnovo in zdravje živali. Zaradi pogostejših vročinskih valov raziskovalci iščejo prehranske strategije, s katerimi bi zmanjšali te posledice. Ena od možnosti je prehransko programiranje z dodatkom netopne prehranske vlaknine (nPV), ki lahko vpliva na razvoj prebavil, njihovo kapaciteto in mikrobioto. V raziskavi smo spremljali vpliv dodatka 20 % nPV v različnih obdobjih reje na prirejo in razvoj prebavil pitovnih piščancev Ross 308, rejenih v termonevtralnem ali vročem okolju. V poskus je bilo vključenih 360 piščancev, razdeljenih v tri prehranske skupine: kontrolno (nPV-0), skupino z dodatkom nPV v drugem obdobju reje (nPV-20-0) in skupino z dodatkom nPV v drugem in tretjem obdobju (nPV-20-20). Rezultati so pokazali, da je dodatek nPV vplival na razvoj prebavil, masa prebavil se je povečala, zlasti masa tankega črevesa. Dodatek nPV je vplival tudi na koncentracijo propanojske, i-maslene, maslene in i-varijanske hlapne maščobne kisline v slepem črevesu, kar kaže na spremenjeno fermentacijsko aktivnost.Sklepamo lahko, da prehransko programiranje z dodatkom nPV med razvojem prebavil pozitivno vpliva na strukturo, zlasti na maso prebavil ter lahko pomaga ohranjati dobre proizvodne rezultate zaradi več zaužite krme tudi v pogojih vročinskega stresa. Environmental temperature is one of the key factors affecting animal welfare. Heat stress, which occurs at excessively high temperatures, negatively influences growth, feed intake, metabolism, and animal health. Due to increasingly frequent heat waves, researchers are seeking nutritional strategies to mitigate these adverse effects. One potential approach is nutritional programming through the inclusion of insoluble dietary fiber (IDF), which may affect the development, capacity, and microbiota of the gastrointestinal tract. In this study, we investigated the effect of adding 20% IDF during different rearing phases on the performance and gastrointestinal tract development of Ross 308 broiler chickens raised under thermoneutral or hot environmental conditions. The experiment included 360 broilers, divided into three dietary groups: a control group (IDF-0), a group receiving IDF supplementation during the second rearing phase (IDF20-0), and a group supplemented during both the second and third rearing phases (IDF20-20). The results showed that the addition of IDF affected the development of the gastrointestinal tract, increasing its total mass, particularly that of the small intestine. The addition of nPV also affected the concentration of propanoic, isobutyric, butyric, and isovaleric volatile fatty acids in the cecum, indicating altered fermentation activity. We conclude that nutritional programming with IDF during gastrointestinal development positively affects gut structure, particularly intestinal mass, and may help maintain good production performance by supporting higher feed intake, even under heat stress conditions. perutnina pitovni piščanci vročinski stres prehrana živali hlapne maščobne kisline prebavila morfometrija histopatologija poultry broilers heat stress animal nutrition volatile fatty acids digestive system morphometrics histopathology true false false M. Sinjur Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-11-01 07:15:55 2025-11-01 07:16:02 2025-12-12 03:37:54 0000-00-00 00:00:00 2025 0 Ljubljana 2025 Ljubljana 1 spletni vir (1 datoteka PDF (X, [64] str.)) 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 636.5(043.2) 270510 255912707 54713.pdf 54713.pdf 1 070D7F28F114514702F6F2FCBE6233FA c39871a453af0974ef9cd75154adcf350c92e33cde40ccc6a8c263442569ac1f eef47840-b6e9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221166 Biotehniška fakulteta 0 0 0