The purpose of this study was to examine the effects of dietary inclusion of walnut and bilberry leaves (WL and BL), as sources of natural antioxidants in poultry diets, on the enrichment of antioxidant nutrients in the egg yolk and on the susceptibility of the yolk to lipid peroxidation during storage. The experiment was conducted on 32-week-old TETRA SL LL laying hens, which were assigned to three dietary treatments with 30 birds each. Each treatment was replicated 10 times with three chicks per replicate pen. Experimental dietary treatments differed from control diet (C) by addition of 0.5% BL supplement or 1% WL supplement. The phytoadditives were not significant contributors to the productive parameters. The addition of BL and WL in laying hens’ diets significantly increased the total polyphenol content, and the zinc, lutein and zeaxanthin concentrations in the egg yolks. In regards to the oxidative stability parameters, a significant decrease in the concentrations of primary oxidation products formed in the egg yolk of experimental groups was seen, proving an efficient inhibition effect of the phytoadditives on peroxyl radical formation. A significant correlation was observed between primary oxidation products and total polyphenol content of the egg yolks, where zinc, lutein and zeaxanthin are the bioactive compounds that inhibit the formation of secondary oxidation products.
Many plants and their constituents (carotenoids, flavonoids and other phenolic compounds), action to inhibit the free radical by the use of antioxidant activity, helping to a better efficiency of nutrients utilization. The purpose of this study was to investigate the antioxidant activity and phenolic content of five different plants, known for their antioxidant potential. Total phenols were determined by FolinCiocalteumethod, with few modifications. The antioxidant capacity was evaluated by DPPH, ABTS radical-scavenging activity and phosphomolybdenum method. The results showed that the highest antioxidant activity was obtained for walnut leaves in terms of ABTS evaluation and for bilberry leaves by DPPH and phosphomolybdenum methods. In the present study, peppermint, walnut and bilberry leaves proved to have an important antioxidant activity and also a total phenolic content.
Coronavirus disease 2019 (COVID-19) has altered the expectations of team leaders by team members while they seek clear and efficient decisions. We aim to assess the perception of leadership by the surgical team members and their perception of the most important quality of leadership. We conducted an online national cross-sectional survey among the surgical doctors working in the National Health Service United Kingdom, between 15th July 2020 till 31st August 2020. The questionnaire, based on rating scale items, focused on effects of changes in work-pattern, support and communication at workplace, the status of leadership and understanding of different leadership attributes. Out of two hundred and thirteen participants, majority of respondents were middle-grade registrars (n= 92, 43.7%). Most of the doctors (147,81.7%) were never re-deployed to the high-risk areas. 85(39.9 %) expressed that COVID-19 brought distress affecting their morale. 106(49.8%) thought that arrangement of Personal Protective Equipment (PPE) was the responsibility of the Head of Department. The majority, of those who fell ill, felt adequately supported by their seniors. Most participants identified departmental leadership as satisfactory (n=126, 59.2%). There was a mixed response to the importance of leadership attributes defined by the Faculty of Medical Leadership and Management. Stress at the workplace with reduced morale, during a crisis like COVID-19 pandemic, can significantly compromise leadership perception among team members. Understanding of basics of leadership by the team members can improve departmental efficiency and as a result improve patient care. Doi: 10.28991/SciMedJ-2021-0303-6 Full Text: PDF
The study aimed to evaluate the transfer of bioactive compounds from sea buckthorn meal (SBM) supplement to eggs and the effect on lipid quality and peroxidation process. Thirty-two-week-old TETRA SL laying hens were allocated to two dietary treatments, 30 birds each (15 replicate pens). The control diet (C) contained a maize-soybean diet, and the experimental diet contained the previous C diet with 2% of maize replaced with SBM. Thirty-six eggs from each group were collected in order to determine the quality parameters at the end of the experiment. The antioxidant profile of SBM showed that the phytoadditive is a valuable source of vitamin E, xanthophylls and polyphenols. The inclusion of 2% of SBM in the experimental diet led to a more than 25% increase of vitamin E and an almost 50% increase of xanthophylls compared to the control. The markers specific to the coronary risk decreased significantly in the experimental group compared to the control, showing a beneficial effect of dietary SBM on the quality of yolk lipids. The bioactive compounds detected in egg yolk showed a significant (P < 0.05) improvement of the antioxidant profile, the rate of vitamin (A and E), carotenoid (lutein and zeaxanthin) and mineral (iron and zinc) deposition increased after dietary SBM inclusion. Regarding the lipid peroxidation parameters, the dietary SBM inclusion acted in the first phase of the lipid peroxidation process by inhibiting the formation of primary oxidation products (hydroperoxides and conjugated dienes). In conclusion, the sea buckthorn supplementation of the laying hen diet improved the bioactive compound concentrations in eggs and delayed the oxidation process of yolk during storage.
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