Abstract
The aim of the study was to estimate the effect of Siberian larch dihydroquercetin and dry distilled rose petals supplementation of lambs’ diet on the quality of meat obtained from Bulgarian dairy synthetic population sheep. The experiments were performed with 30 clinically healthy male lambs aged 65 days with equal live weight. There were studied one control group (C) fed for 50 days with ground alfalfa + granulated compound feed and two experimental groups (D) and (R) fed on the same diet supplemented either with 7.5 mg dihydroquercetin/kg/day or with 545 mg DDRP/kg/day respectively. The DDRP diet supplementation increases the sensory scores, carotenoids and essential amino acids of muscles (P ≤ 0.05) but does not affect the content of tocopherols. No significant differences (P > 0.05) were found comparing the proximate composition of the group C, R and D. Compared to control group C the supplementation of lambs’ diet with dihydroquercetin and DDRP contributes to a certain increase in the sterols in muscle and adipose tissues but not in liver tissue (P ≤ 0.05). A reduction of WHC of m. Longissimus dorsi and microbial deterioration in both muscles and perirenal fatty tissue was found in experimental groups D and R.
Highlights
Nowadays various approaches to modifying the proximate composition and improving the quality and nutritional value of meat are increasingly being discussed [1,2,3,4]
Longissimus dorsi showed that the highest sensory scores were obtained from samples R followed by samples D and the lowest being in control samples C (Fig. 2 and Fig. 3)
Semimembranosus (Fig. 4 and Fig. 5). They demonstrated higher sensory scores in samples R obtained from lambs consumed feed with the addition of DDRP and samples D compared to control samples C
Summary
Nowadays various approaches to modifying the proximate composition and improving the quality and nutritional value of meat are increasingly being discussed [1,2,3,4]. The addition of various natural antioxidants to diets in order to increase the oxidative stability of meat has been suggested [5]. Various plant extracts and preparations with antioxidant and bactericidal properties have been widely studied including: tea catechins and α-tocopherol [6], ethanol extracts of rosemary, white peony, red peony, sapan wood [7], anise, dill, black pepper, cinnamon [8] etc. Newer, beneficial to human health, biologically active ingredients such as dihydroquercetin from Siberian larch (Larix sibirica Ledeb) [9] and dry distilled rose petals (Rosa damascena Mill.) (DDRP) [10]. Two main bioflavonoids have been found in the bark of Siberian larch: dihydroquercetin and dihydrokaempferol [11]. It inactivates alkyl peroxyl and superoxide radicals [13], reduces phospholipase C-induced hemolysis and inhibits superoxide produced by xanthine oxidase [14]
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