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The objective of this study was to determine the changes in the quality of  m. Longissimus dorsi  and  m. Semimembranosus  and perirenal adipose tissue from lambs fed a diet supplemented by 7.5 mg dihydroquercetin/kg/day or 545 mg dry distilled rose petals (DDRP)/kg/d. The experiments were performed with 30 male lambs aged 65 days. They were divided into three groups of 10 animals fed 50 days ad libitum: control group (with ground alfalfa + granulated compound feed) and two experimental ones (with the same diet + phytonutrients). Samples stored for 1 and 7 days at 2 ± 2°C were examined. After 7 d of storage, the addition of 545 mg DDRP/kg/d contributed to a decrease in pH by 2-6% in both types of tissues and reduced the accumulation of α-aminoacidic nitrogen by 7-14% and TBARS by more than 20% in both muscles tested. The lambs' diet supplementation with both phytonutrients led to a reduction in the aerobic plate count and total combined yeasts and molds count. The addition of dihydroquercetin was found to be responsible for the reduction of FFA and the total color difference as well as for approx. a 5% increasing the amount of monounsaturated fatty acids. This influence is more pronounced in  m. Longissimus dorsi . Further studies are needed to determine whether the application of higher doses of DDRP and dihydroquercetin as dietary supplements in lambs will provoke a more pronounced inhibitory effect on lipid oxidation and the fatty acid composition of lamb and fats.

The effect of dietary dry distilled rose petals or dihydroquercetin supplementation on the oxidative stability and quality of lamb muscles and fat.