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• Optimization of Herbal Supplements in Broilers Diet for Decreasing Total Cholesterol in Blood Plasma of Chicken by using Response Surface Methodology

  Ha Xuan Bo, Vu Viet Anh, Dang Thuy Nhung

  Received: 16-11-2021 / Accepted: 01-03-2022

   Abstract PDF (VIETNAMESE)

  This study was conducted to optimize the levels mixed herbal supplements in broilers diet for decreasing total cholesterol in blood plasma of chicken at 8 and 16 weeks of age. Six herbals supplements, garlic (Allium sativum), Chinese wedelia (Sphagneticola calendulacea), perilla (Perilla fruitescens var. crispa), turmeric (Curcuma longa), ginger (Zingiber officinale), and green tea (Camellia sinensis) were supplemented in the diet. A total of 126 male Dong Tao chickens were raised in animal farm of Vietnam National University of Agriculture from April 2021 to September 2021. This study was designed in two experiments: 1) Plackett-Burman matrix was designed to study the factors that affect total cholesterol content, 2) Response surface method (RSM) with central composite design (CCD) matrix was designed to optimize the levels mixed herbal supplements in diet. Garlic, turmeric, ginger, and green tea that have significantly contributed to total cholesterol in blood plasma was selected to design a matrix for modeling optimal point. The result of response surface method (RSM) with central composite design (CCD) showed the minimum value of total cholesterol 2.80 mmol/l (8 weeks of age) and 2.70 mmol/l (16 weeks of age) with level supplement of garlic (0.833 and 0.882 g/kg), turmeric (0.420 and 0.441 g/kg), ginger (1.411 and 5.400 g/kg), and green tea (5.221 and 6.215 g/kg), respectively. The lowest value of total cholesterol in the practical model was 2.80 mmol/l and 2.70 mmol/l.

• Ảnh hưởng của việc bổ sung bột quế trong khẩu phần ăn đến khả năng sinh trưởng, năng suất thịt và các chỉ tiêu sinh lý, sinh hoá máu gà thịt

  Vu Quynh Huong, Nguyen Van Duy, Nguyen Thi Nga, Vu Dinh Ton

  Received: 17-04-2020 / Accepted: 29-08-2023

   Abstract PDF (VIETNAMESE)

  Nghiên cứu này được thực hiện trên gà trống lai F1(♂Đông Tảo x ♀Lương Phượng) từ 7 đến 13 tuần tuổi nhằm đánh giá ảnh hưởng của bổ sung bột quế đến khả năng sinh trưởng và một số chỉ tiêu sinh hoá, sinh lý máu gà. Tổng số 90 con gà được chia ngẫu nhiên vào 3 lô, mỗi lô 30 con. Từ 7 tuần tuổi gà được nuôi bằng các khẩu phần ăn thí nghiệm gồm: lô đối chứng không bổ sung bột quế, lô 2 (CT1) bổ sung 2 gam bột quế/kg thức ăn và lô 3 (CT2) bổ sung 2,5 gam bột quế/kg thức ăn. Khả năng sinh trưởng, năng suất thịt của gà ở 2 lô bổ sung bột quế cao hơn so với lô đối chứng (P <0,01). Chỉ tiêu cholesterol toàn phần, LDL-cholesterol ở lô CT1 và lô CT2 thấp hơn so với lô đối chứng (P <0,05), trong khi HDL-cholesterol của lô CT1 và lô CT2 cao hơn so với lô đối chứng (P<0,05). Chỉ tiêu AST và ALT ở lô CT1 và lô CT2 thấp hơn so với lô đối chứng (P <0,05). Tế bào lympho và bạch cầu trong máu gà ở lô CT1 và lô CT2 thấp hơn so với lô đối chứng (P <0,05). Gà được nuôi bằng khẩu phần ăn của lô CT1 có chi phí để sản xuất 1kg gà thấp hơn so với lô đối chứng và lô CT2.

• Reproductive Performance and Egg Quality of Na Tau Ducks

  Nguyen Thi Vinh, Tran Bich Phuong, Nguyen Thi Phuong, Nguyen Van Thong, Nguyen Thi Phuong Giang, Ha Xuan Bo, Nguyen Hoang Thinh, Pham Kim Dang

  Received: 12-12-2023 / Accepted: 24-06-2024

   Abstract PDF (VIETNAMESE)

  The study was conducted to evaluate reproductive performace and egg quality of Na Tau ducks raised at Faculty of Animal Science, Vietnam National University of Agriculture. A total of 105 Na Tau ducks (15 males and 90 females)was used to estimate laying age and weight; egg yield; FCR and egg quality parameters. Na Tau ducks had laying ages at 141.67 days; the weight of the ducks when laying was 1978.02g. The laying rate in the period of 1-38 weeksreached 63.91%; egg yield reached 170 eggs/hen/38 weeks of laying; and FCR was 3.56 kg of feed/10 eggs.The egg weight and Haugh units were70.04g and 72.11, respectively. Na Tau duck eggs contained 28.21% dry matter, 12.15% protein, 14.7% lipids, 1.04% Ash, and453.67mg/100g of cholesterol concentration. The highest non-essential amino acid content in Na Tau duck egg was Glu (3.6 g/100g), followed by Asp (2.4 g/100g) while the highest concentrated essentialamino acid was Leu (2.27 g/100g). The rate of embryonated eggs,hatching rate/embryonated eggs and the rate of type 1 ducks was 89.21%, 68.45%, 90.66%, respectively.

• Tea (Camellia sinensis O. Kuntze) Seed Oil - Physical Properties and Applicability in Food Industry: an Overview

  Phan Thi Phuong Thao, Nguyen Vinh Hoang, Le Minh Nguyet, Vu Hong Son

  Received: 01-03-2021 / Accepted: 04-05-2021

   Abstract PDF (VIETNAMESE)

  Tea (Camellia sinensisO. Kuntze) is one of the most popular crops and is considered a traditional beverage in many countries. The tea seed oil has been studied with the objectives to analyze the physical and chemical properties with a view for quality assessment, composition and applications. Physical and chemical properties such as state, specific gravity, acid value, peroxide value, iodine value, saponification value etc.were studied.Similar to olive oil, tea seed oil is a high-quality cooking oil with great stability because it has a large number of natural antioxidants including carotenoid (3.2 mg/kg), total polyphenols (8.68 mg/kg) and vitamin E (262.4 mg/kg). Moreover, tea seed oil is vegetable oil with high nutritional values due to its high content of unsaturated fatty acids (81.8 %), especially linoleic acid (22.3 %), which was previously proved to be useful in reducing cholesterol levels in the blood and preventing heart diseases, high blood pressure, and cancer. Studies show that different extraction methods of tea seed oil such as pressing, extracting by solvent, supercritical fluid, etc., yield oil with different efficiency and quality.

• Effect of ExtractionConditions on Polyphenol Content and Antioxidant Activityof the Extract from Gynura Procumbens(Lour) Merr. Leaves

  Nguyen The Han, Pham Thi Kim Quyen, Nguyen Van Minh

  Received: 18-03-2016 / Accepted: 15-07-2016

   Abstract PDF (VIETNAMESE)

  Gynura procumbens(Lour.) Merr.is a well- known traditional herb in South East Asia and it is widely used to treat inflammation, high cholesterol level, high blood pressure and diabetes. In the present study, the effects of various extractionconditionswere investigated:solvent, solvent concentration, materialto solvent ratio, extraction temperature, extraction time and extraction techniques (maceration and ultrasonic- assisted) on total phenolic content (TPC) and antioxidant activity of the extract fromleaves of Gynura procumbens(Lour) Merr. cultivated in Khánh Hoa province.Folin- Ciocalteu’s method was used for the determination of TPC, while theantioxidant activity was determined by 2,2’ - diphenyl - 1 - picrylhydrazyl (DPPH) radicalscavenging activity and reducing power assays. The best extraction conditions were as follows: 50% aqueous methanolas the extraction solvent,1: 50 materialto solvent ratio, the extraction temperature at60C and the extraction time of30 min, using ultrasonic- assisted extraction. The total phenolic content, DPPH radical scavenging activity (EC50) and reducing power (EC50) under suitable condition, were 48.49 mg GAE/g dry extract, 0.13 and 0.06 mg/ml, respectively. The present study suggested that the Gynura procumbens extract could be a promising source of natural antioxidants.