PL
Celem badań było określenie wpływu mieszanek paszowych, w których 5-procentowy dodatek poekstrakcyjnej śruty sojowej zastąpiono 5-procentowym dodatkiem DDGS z kukurydzy lub makuchu rzepakowego, na skład chemiczny i profil kwasów tłuszczowych w mięsie królików. Materiał doświadczalny stanowiło 30 królików NB odchowywanych do wieku 90 dni. Analizę jakościową mięsa przeprowadzono w mięśniach combra, oznaczając: pH₄₅ i pH₂₄ₕ, zawartość wody, białka, tłuszczu i profil kwasów tłuszczowych. Obliczono indeks aterogenny i trombogenny. Dodatek wymienionych pasz do mieszanki miał istotny wpływ na zmniejszenie (p ≤ 0,01) otłuszczenia tuszki. Przy skarmianiu granulatem z dodatkiem makuchu rzepakowego stwierdzono istotne (p ≤ 0,01) zmniejszenie ilości kwasu palmitynowego, sumy SFA oraz stosunku n-6/n-3, a zwiększenie sumy UFA i PUFAn-3. Przy dodatku DDGS z kukurydzy stwierdzono istotny wzrost (p ≤ 0,01) udziału kwasów EPA i DHA i zmniejszenie stosunku kwasów n-6/n-3. Wartości wskaźnika AI i TI były najkorzystniejsze w grupie królików otrzymujących w mieszance dodatek makuchu rzepakowego.
EN
The aim of the study was to determine the effect of dietary mixtures containing 5% maize distillers’ dried grains (DDGS) or rapeseed cake on chemical composition and fatty acid profile of rabbit meat. The experiment used 30 New Zealand White rabbits, which were randomly assigned to three equal groups at 35 days of age and fattened until the age of 90 days. In the experimental diets, 5% soybean meal was replaced with the same amount of maize DDGS (group SWK) containing 30% protein or with rapeseed cake containing 32% protein (group MR). The carcasses from slaughtered animals were dissected. Meat quality analysis was performed in saddle muscles (musculus longissimus lumborum) and measured the following groups of traits: pH 45 min postmortem (pH₄₅) and after 24-hour chilling at 4°C (pH₂₄ₕ); basic chemical composition (water, protein and fat content) and fatty acid profile. Calculation was made of the atherogenic index (AI), which shows the relationship between proatherogenic saturated fatty acids (which contribute to the binding of lipids to vascular endothelial cells) and antiatherogenic unsaturated fatty acids (which reduce cholesterol level and prevent the incidence of coronary artery disease), and of the thrombogenic index (TI), which shows the tendency to form clots in the blood. Our results confirm the possibility of feeding rabbits with dried DDGS and rapeseed cake. The addition of these feeds to the pelleted diet had a significant effect on reducing (p ≤ 0.01) carcass fatness and on improving the fatty acid profile of rabbit meat. Special consideration should be given to the significant (p ≤ 0.01) decreases in the amount of palmitic acid, total SFA and the ratio of n-6/n-3PUFA, and the increases in total UFA and n-3PUFA when feeding a pelleted diet with 5% rapeseed cake. Adding 5% maize DDGS to the diet had a beneficial effect for the consumer as it significantly (p ≤ 0.01) increased the proportion of EPA and DHA as well as reducing the ratio of n-6/n-3. The estimated values of AI and TI suggest that the proportion of individual fatty acids plays an important role in the dietetic value of rabbit meat. AI and TI values were most beneficial in the group of rabbits supplemented with 5% rapeseed cake in the diet.