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Interest in meat fatty acid (FA) composition stems mainly from the need to find ways to produce healthier meat with a suitable ratio of polyunsaturated (PUFA) to saturated fatty acids (SFA) and a favourable balance between n-6 and n-3 PUFA. Studies of grass feeding versus grain feeding cattle have been conducted in different regions throughout the world and suggest that grass-based diets can significantly improve the fatty acid (FA) composition of beef. Compared with grain diets, grass diets contribute to a lower total fat content and more favourable SFA composition i.e. higher proportion of low density lipoprotein (LDL) and cholesterol-neutral stearic acid (C18:0). Feeding fresh grass compared to concentrates results in higher levels of n-3 PUFA in muscle lipids and a more favourable n-6/n-3 PUFA ratio that is within the nutritional recommendations for the human diet.

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UvodTransport životinja za dobijanje mesa od farme do klanice je sve više u sferi interesovanja, kako stručne i naučne, tako i šire javnosti. Ovome je posebno doprinela činjenica da je Svetska organizacija za zaštitu zdravlja životinja (OIE, Offi ce International des Epizooties, The World Organization for Animal Health) prepoznala značaj uticaja transporta na dobrobit životinja i kvalitet mesa (OIE, 2004). S obzirom da transport menja celokupan ambijent na koji je životinja bila prilagođena (Karabasil i dr., 2013), to može da ima za posledicu različite nivoe stresa, koji se mogu manifestovati promenama, od blage uznemirenosti do izrazitih simptoma stresa, koji mogu da imaju za posledicu uginuće životinja. Faktori, kao što su zdravstveno stanje jata, manipulacija tokom utovara i istovara, dizajn kaveza, broj jedinki u kavezu, mikroklimatski uslovi tokom transporta, dužina transporta i period gladovanja određuju stepen uticaja transporta na kvalitet mesa i dobrobit živine.Dužina transporta živine od farme do klanice može imati negativan uticaj na dobrobit i kvalitet mesa, što potvrđuje većina objavljenih studija, koje ukazuju na povećanje mortaliteta živine sa poveća-njem dužine transporta (Vecerek i dr., 2006; Warriss i dr., 1990). Sa druge strane, Vosmerova i dr. (2010), u svojim istraživanjima, konstatuju da i kraći transport može uzrokovati promene kvaliteta mesa, usled nemogućnosti živine da za kratko vreme prevaziđe stres koji je izazvan manipulacijom tokom prebacivanja u kaveze za transport. Manipulacija živinom prilikom utovara u transportno sredstvo se smatra većim izvorom stresa čak i od samog transporta. Ritz i dr. (2005) su ustanovili da povećanje temperature okolne sredine tokom utovara predstavlja veći rizik za živinu u odnosu na situaciju kada je prevozno (5,40±0,20 i 5,71±0,30, respektivno) bile su značajno manje u odnosu na pH vrednosti izmerene nakon transporta u zimskom periodu (5,90±0,18 i 6,46±0,25, respektivno). Manje vrednosti kala pečenja kod uzoraka grudnog mišića i uzoraka bataka (29,06±2,80 i 29,69±3,47, respektivno) Napomena: Prezentovani rezultati proistekli su iz rada na realizaciji Projekta bilateralne saradnje između Republike Srbije i Republike Slovenije TR-31008 koji fi nansira Ministarstvo prosvete, nauke i tehnološkog razvoja Republike Srbije.

A total of 63 European hares have been collected from five Serbian agricultural regions. The hares assayed were divided into four age groups (3-6 months, 12 months, 12-24 months, and 24-36 months) and investigated upon presence at cadmium (Cd) and mercury (Hg) in the kidney and liver. The positive significant correlation (Ps-Pearson's coefficient) between Cd concentrations in the kidney and liver within age group the 3-6 months was found (Ps = 0.81, p < 0.001). Differences between Cd content in the kidney in comparison to liver were significant within all presented age groups (p < 0.001). Differences between recorded Hg levels in the kidney were not significant between presented age groups (p > 0.05). Statistically significant differences were registered between Hg content in the liver of the hares aged 24-36 and 12 months (p < 0.05). There were no statistically significant correlations registered between Hg concentrations in the kidney and liver within any particular age group (p > 0.05). The strong statistically significant associations were registered between Cd and Hg content in the liver (Cd L/Hg L) in the age group 3-6 and 12-24 months (Cd L/Hg L, Ps = 0.94; p < 0.001 and Ps = 0.91; p < 0.001, respectively). The polynomial regression model used for graphing the observed data seems to be a method for modeling the relationship between measured Cd and Hg concentrations in the liver and kidney as first approximation for bioaccumulation in hares.