Effects of high vitamin and micro-mineral supplementation on growth performance and pork quality of finishing pigs under heat stress | Vpliv dodatka vitaminov in mikrorudninskih snovi v krmo za prašiče pitance na prirast in kakovost mesa v pogojih vročinskega stresa

English. The objective of this study was to determine the effects of heat stress (HS) on the production performance of fattening pigs and whether the supplementation of vitamins (C and E) and micro-minerals (Se and Zn) at increased concentrations can mitigate HS adverse effects. Thirty six Danbred hybrid barrows (65.1 ± 2.81 kg) were randomly distributed into four treatments 1) HS (28.9 ± 0.9 °C, RH- 60.4 ± 4.3 %) + control diet (HC), 2) HS + diet 1 (HT1), 3) HS + diet 2 (HT2), and 4) thermo-neutral conditions (19.5 ± 0.9 °C, RH- 85.9 ± 7.3 %) + control diet (TC). Bodyweight and feed intake were measured weekly for four weeks. After the experiment, six pigs from each treatment were slaughtered, and the longissimus lumborum muscle was sampled to evaluate meat quality. At week four, HS significantly affected pig body weight (p < 0.05). However, the other parameters were not significantly affected by HS,while slight improvements in these parameters were observed by supplementing vitamins and micro-minerals in the diet of the pigs despite exposure to HS. Therefore, the pigs used in the study showed resilience to adverse effects of HS on growth and meat quality parameters. The content of vitamins C and E and microminerals Se and Zn in the diet seems to play an important role in resilience to HS, therefore their requirement and supplementation should be carefully evaluated.

Slovenian. Cilj raziskave je bil ugotoviti učinke vročinskega stresa (HS) na prirast prašičev pitancev in ali lahko z dodajanjem vitaminov (C in E) in mikrorudninskih snovi (Se in Zn) v povečanih koncentracijah ublažimo škodljive učinke HS. Šestintrideset kastratov Danbred križancev (65,1 ± 2,81 kg) je bilo naključno razdeljenih v štiri skupine 1) HS (28,9 ± 0,9 °C, RV- 60,4 ± 4,3 %) + kontrolna krmna mešanica (HC), 2) HS + krmna mešanica 1 (HT1), 3) HS + krmna mešanica 2 (HT2) in 4) kontrolni pogoji (19,5 ± 0,9 °C, RV- 85,9 ± 7,3 %) + kontrolna krmna mešanica (TC). Telesno maso in zauživanje krme smo merili štiri tedne. Po koncu poskusa smo žrtvovali šest živali iz vsake skupine in vzorčili mišico longissimus lumborum za oceno kakovosti mesa. Ugotovili smo, da je v četrtem tednu HS negativno vplival na telesno maso prašičev (p < 0,05). HS ni statistično značilno vplival na druge parametre, pri čemer smo opazili trend izboljšanja teh parametrov ob dodajanju vitaminov in mikrorudninskih snovi v krmo prašičev, ki so bili izpostavljeni HS. Prašiči, uporabljeni v študiji, so pokazali odpornost na škodljive učinke HS na rast in parametre kakovosti mesa. Zdi se, da ima vsebnost vitaminov C in E ter mikrorudninskih snovi Se in Zn v prehrani prašičev pomembno vlogo pri odpornosti na HS, zato je potrebno skrbno oceniti potrebe po dodajanju omenjenih dodatkov v krmo prašičev.