維生素e與應(yīng)激反應(yīng)外文翻譯-在線瀏覽
2025-07-30 19:08本頁(yè)面
【正文】 blood pressure, loss of appetite, reduced sexual function, slow growth, the most serious from fear of death. 3, 3 immune resistance Chicken in the stress, the increase in the secretion of epinephrine, make blood lymphocytes decreased, at the same time, because of increased protein catabolism, used to produce immunoglobulin raw material is relatively reduced, the vaccine, antibody formation was reduced, low antibody level in the body, can not achieve the desired effect of the immune. 3, 4 to induce various diseases Stress not only make chicken lower only specific immunity in chickens, and non specific resistance is generally reduced, easy to induce a variety of diseases, such as blueb disease, chronic respiratory disease, infectious coryza, aspergillosis, bursitis, fowl cholera, ulcerative enteritis. 4, immunological stress Immunological stress animal is the animal vaccination appear individual allergic, a handful of animal body temperature, some animal anorexia, metabolism, growth, feeding cycle extension phenomenon. Generalized immune also known as immune challenge in immunology, which inject antigen to stimulate the immune response. In the animal life, there are many factors (including infection, trauma and tumor) can cause immune stress. In the immunity during stress, cytokines especially produced by monocytes and macrophages in the inflammatory cytokines IL1, IL6 and TNF α mediated inflammation response system, if have a fever, loss of appetite, also plays a role in nutrient redistribution agent, can be used in the growth and skeletal muscle protein deposition of nutrients for related process to maintain the immune response. The amount of inflammatory cytokines produced in favor of the body against infection, but produces too much will cause varying degrees of damage to the body. Especially the TNF α causes pathological reaction in inflammatory conditions or inflammatory diseases. The study found that can activate the immune system of the material are likely to stimulate the body to produce immunity stress (Kelly, 1998). The immune system has the ability to give priority to the use of nutrients, when the animal immune stress, immune system activation, release of cytokines (CK, CK) regulate metabolism process, affecting the growth of demand and the mode properties and nutritional needs. Research shows that, the change of stress is mainly mediated by CK. Webel (1998) to the pig injection of Escherichia coli lipopolysaccharide increases the secretion of IL6, TNF α, plasma concentration of TNF α 2 hours increased by 10 times. Klasing (1987) to the chickens infected with Actinobacillus pleuropneumoniae were observed after the concentration of serum IL1 was significantly higher than that in non stress group. Many studies have confirmed that, the livestock and poultry immune stress reduced feed intake, reduce the feed conversion rate, delay the time to market, reduce protein deposition, carcass lean meat rate, eye muscle area reduction. Continuous enhancement of the productivity of laying hens, immune response ability is reduced gradually, in the actual production, although the contact of pathogenic microorganisms chance reduced by improving the health status of new technologies, adopt measures, but the hen is inevitably accept various stimuli, often in a normal stress a return to a normal cycle, production performance the need to maintain, increase the proportion of deposits, reduce skeletal protein, ultimately affect the performance and immune function mechanism 5, immunological stress on immune system of an Mechanisms of th
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