Download or read book Effects of Dietary CLA on Fatty Acid Composition of Egg Yolks and delta 9 delta 6 and delta 5 Desaturase Activities of Livers of Laying Hens written by Irene Karantzeni and published by . This book was released on 2000 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conjugated linoleic acid (CLA) alters the fatty acid composition of chicken eggs. It also decreases hepatic stearoyl-CoA desaturase mRNA in HepG2 cells. The fatty acid composition of egg yolks was investigated as a function of amount of dietary CLA for laying hens. In addition, the activities of [Delta]9-, [Delta]6-, and [Delta]5- desaturases in hen liver were investigated as a function of CLA in the diet. Forty-eight Leghorn laying hens were assigned randomly to one of four dietary treatments formulated to contain 0, 1.25, 2.5, and 5.0% CLA. The fatty acid composition of yolk lipids was altered by dietary CLA, with a decrease in unsaturated fatty acids (palmitoleyl, linolenic, and arachidonic acids). The amount of CLA in eggs increased linearly with amount of dietary CLA. [Delta]9- and [Delta]5- Desaturase activities were lower in livers from hens fed the 5% diet than in livers of hens fed the 0% diet. [Delta]6-Desaturase activity was very low in livers of hens in all groups. In summary, dietary CLA decreases the amount of unsaturated fatty acids in chicken eggs with a corresponding decrease in desaturation activity in the hen liver microsomes.
Download or read book Effect of Dietary Conjugated Linoleic Acid CLA on the Fatty Acid Status in Chicken and Meat Quality written by Min Du and published by . This book was released on 2001 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation includes studies on the effect of dietary CLA on the growth, fat accumulation and fatty acid status of chicken, and chicken meat quality as influenced by irradiation. Results showed that dietary CLA did not have significant effects on the growth rate and feed efficiency in chicken. And high levels of dietary CLA slightly reduced the whole body fat content. High ratio of dietary CLA can incorporate into chicken meat and egg yolk. Dietary CLA reduced the concentration of monounsaturated fatty acids. The concentration of polyunsaturated fatty acids, including arachidonic acid, linolenic acid and linolenic acid, also reduced as the dietary CLA level increased. However, when the dietary level of linolenic acid in diet was high, dietary CLA stimulated the synthesis of DHA and EPA, which might directly relate to the biological effects of CLA. High level of dietary CLA influenced the quality of meat, which was slightly harder and drier compared to the control meat. Dietary CLA significantly improved the oxidative stability of chicken meat. The reason for the improved oxidative and color stability of meat patties during storage should be due to the reduced unsaturated fatty acid content in chicken muscles, which improved lipid and color stability and reduced volatile production in both irradiated and nonirradiated meat during storage. Irradiation greatly increased the volatile production and induced a metal-like off-odor in chicken rolls, and dietary CLA had synergistic effect on this metal-like off-odor. Irradiation also increased the redness of chicken rolls. Consumers had a preference for the color of irradiated chicken rolls, while their reactions to the flavor of irradiated chicken rolls were quite negative.
Download or read book Master s Theses Directories written by and published by . This book was released on 2000 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Download or read book The Effects of Dietary Conjugated Linoleic Acid on Avian Lipid Metalbolism written by Rahim Aydin and published by . This book was released on 2000 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 2000 with total page 1844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Dietary Fats on Some Chemical and Functional Properties of Eggs and on Some Chemical Properties of the Lipids of Liver Blood and Depot Fat of the Hen written by Richard Dorris Pankey and published by . This book was released on 1967 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Dietary Linoleic Acid on Conversion of Omega 3 Fatty Acids to Long Chain Fatty Acids written by Elizabeth Flaherty and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the modern diet that is high in total fats, high in omega-6 fatty acids (FA), and low in omega-3 FA, there is a high prevalence of metabolic and cardiovascular disease. Certain dietary acids are beneficial, while others may contribute to these disease processes. Eggs are an important part of the human diet as they are protein and nutrient dense and are a good source of vitamins and minerals. It is possible to manipulate the nutrients and composition of FA in the eggs by modifying the balance of the hens diets. This makes them a good target for experiments with fatty acids (FA). A diet high in omega-3 (n-3) FA has many beneficial effects including plasma lipid reduction, reduction in some types of cancer mortality, anti-inflammatory effects, antiarrhythmic effects, antithrombotic effects, antiatheromatous effects, and less severe manifestations of autoimmune diseases and inflammatory diseases. Due to the benefits of n-3 FA, it is important to understand the effects of oleic acid and linoleic acid (LA; C18:2n-6) on the deposition of n-3 FA in egg yolks. The goals of the experiment are to determine the effect of these FA on deposition of ALA and VLC n-3 FA in yolks. It is hypothesized that LA will have a negative impact on the deposition of ALA in yolks as they compete for elongase and desaturase enzymes. Additionally, it is expected that oleic acid will also have a negative effect on n-3 deposition in yolks.Fifty hens were randomly assigned to one of five dietary treatments that included a control, two levels of high oleic safflower oil (HOSO; 2% and 4%), and two levels of high linoleic safflower oil (HLSO; 2% or 4%). All diets contained 4% flaxseed oil (FLAX) to provide -linolenic acid (ALA; C18:3n-3) as a substrate for synthesis of the very long chain omega-3(VLC n-3) FA. Egg samples were collected on day 0 and day 28 of the experiment and were analyzed for yolk weights and FA composition. Samples of adipose and liver tissue were collected on day 28 for FA analysis.Increasing dietary oleic acid (18:1n-9), provided by HOSO, had a positive effect on deposition of oleic acid in the yolk. Increased dietary linoleic acid (LA; C18:3n-6), provided by HLSO, had a negative effect on oleic acid deposition. HOSO and HLSO also negatively affected the deposition of ALA and VLC n-3 FA in yolks. This supports previous experiments that showed dietary n-6 FA had a negative effect on deposition of n-3 FA in yolks as a result of competition for the elongase and desaturase enzymes. The diet that is most conducive to developing a high n-3 fatty acid egg is a diet with a high level of ALA and a low level of oleic and linoleic acid.
Download or read book The Effects of Varying Levels of Dietary Linoleic Acid on Omega 3 Fatty Acids in Egg Yolk written by Brittany A. Neal and published by . This book was released on 2005 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Dietary Fat Source and Level on Laying Hen Performance and Changes in Fatty Acid Composition of Liver Egg Yolk and Adipose Tissue written by Jeong Seok Sim and published by . This book was released on 1970 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Egg Yolk Lipids and Ovo cholesterol Metabolism written by Zhirong Jiang and published by . This book was released on 1992 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alpha linolenic Acid Metabolism in the Egg and the Developing Chick Embryo written by Geetha Cherian and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1993 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transfer of Dietary Conjugated Linoleic Acid to Egg Yolks of Chickens written by Marisa Chamruspollert and published by . This book was released on 1998 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of these experiments show that eggs produced by hens fed 5.0% CLA will contain 310 to 365 mg of CLA per egg. Such eggs could provide substantial CLA to human food, assuming that there are no adverse effects of CLA on quality characteristics of eggs.
Download or read book Effects of Dietary Fat on the Fatty Acid Composition of Turkey Embryos written by Bonita Manis Cornett and published by . This book was released on 1971 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Dietary Essential Fatty Acids Supplementation on Laying Hen Performance Egg Yolk Fatty Acid Profile and Egg Functional Properties written by Feng Zhao and published by . This book was released on 1999 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Dietary Lipids and Cholesterol on Liver and Yolk Cholesterol Levels and Fatty Acid Composition of Serum Cholesterol Esters in Laying Hens written by Lincoln F. Berrio and published by . This book was released on 1988 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatty Acid Metabolism in Poultry written by Reza Poureslami and published by LAP Lambert Academic Publishing. This book was released on 2010-07 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current dietary recommendations for reducing the risk of cardiovascular diseases underline I) increasing MUFA intake (mainly 18:1n-9) at the expense of SFA intake (mainly 16:0) and II) increasing n-3 LC PUFA intake. Chicken egg and meat are natural sources of n-3 LC PUFA, and their consumption contributes to the intake of these semi-essential nutrients. Many efforts have been made to improve their fatty acid composition however, some aspects remain uncertain. The specific objectives of the present PhD thesis were [1] to study metabolism of fatty acids (accumulation and bioconversion efficiency) in broiler chickens and the impact of dietary fatty acids composition, and animal factors on the fatty acid metabolism, [2] to study the effect of animal factors together with diet on the fatty acid composition of muscles and organs in broiler chickens and [3] to study the interaction effects of dietary fatty acids on the egg yolk fatty acid composition. To fulfill these objectives, three experiments were carried out of which one trial was performed on broiler chicken and the two others on laying hens.
Download or read book Effect of Dietary Linoleic Acid on Fatty Acid Metabolism of Laying Hens written by W. Guenter and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
