共轭亚油酸在蛋鸡生产中的应用研究进展

共轭亚油酸(Conjugated linoleic acid,CLA)有抗癌、减肥、降血脂、预防动脉粥样硬化、抗糖尿病、抗氧化、增强免疫等生理功能。鸡蛋蛋黄能有效富集CLA,可作为人体补充CLA的营养策略。文章综述了CLA的生理功能及其影响蛋黄脂肪酸组成、降低胆固醇、改善蛋壳品质,有利于蛋鸡骨骼代谢的机制,为研究CLA在蛋鸡体内的吸收、代谢、调控机制提供参考。     

共轭亚油酸对猪胴体和肉品质的影响

共轭亚油酸(CIA)的生物学功能及在畜禽生产中的应用效果是近年来的研究热点之一.研究结果表明,CLA能明显改善猪的胴体组成,降低脂肪沉积,提高胴体瘦肉率,改善猪肉品质.     

反刍动物共轭亚油酸的合成及其影响因素

共轭亚油酸(Conjugatedlinoleicacid ,CLA)指一系列含有共轭双键、具有位置和空间构型不同的十八碳二烯酸同分异构体的混合物,是一种天然活性物质。共轭亚油酸具有很强的生理功能,主要有抗癌、抗动脉粥样硬化、抗氧化、降低胆固醇、促进生长、抑制脂肪累积、增强机体免疫能力、改善骨组织代谢和抗糖尿病等功能。CLA能改善动物机体代谢,重新分配营养素,减少脂肪沉积,增加瘦肉率和提高免疫系统功能等。共轭亚油酸成为目前动物营养等研究领域的热点,主要集中在共轭亚油酸的生理作用、来源和对提高畜禽肉品质的影响,而对于CLA在反刍动物体内…     

共轭亚油酸对猪酮体和肉品质的影响

共轭亚油酸（cLA）的生物学功能及在畜禽生产中的应用效果是近年来的研究热点之一。研究结果表明，CLA能明显改善猪的胴体组成，降低脂肪沉积，提高胴体瘦肉率，改善猪肉品质。     

日粮共轭亚油酸调控猪肌内脂肪的研究进展

共轭亚油酸具有抑癌、抗动脉硬化、调节脂代谢、提高免疫力等多种生理功能。本文主要就共轭亚油酸调控猪肌内脂肪的研究进展进行概述,以期为改善猪肉品质提供科学参考。     

共轭亚油酸对猪体作用的研究进展

共扼亚油酸是一类不饱和脂肪酸的总称,具有广泛的生理功能,能提高猪的生产性能,改善猪肉品质。对共轭亚油酸对猪生产性能、猪肉品质以及免疫功能几个方面的影响进行了综述。     

共轭亚油酸的主要生理功能及在养猪生产中的应用研究

随着现代畜牧业的快速发展,新型饲料添加剂在养殖生产中的应用越来越多。共轭亚油酸(CLA)作为一种天然的新型功能性脂肪酸,具有减少体脂和提高动物生产性能、改善胴体品质等特殊生理功能。本文主要从其来源、生理功能及在现代养猪生产中的应用研究作一综述。共轭亚油酸是一类具     

功能性共轭亚油酸在饲料中的应用进展

<正>亚油酸是动物机体不可缺少的且体内无法自身合成的必需脂肪酸之一,共轭亚油酸(CLA)是亚油酸的同分异构体,其共轭双键通常位于C9位和C11位或C10位和C12位,每个双键可以呈顺式或反式构型存在,普遍存在于反刍动物性食品如牛奶、奶酪、牛肉、羊肉及脂肪中。CLA具有抗癌、抗动脉粥样硬化、抗氧化、降低胆固醇、促进生长、抑制脂肪累积、增强机体免疫能力、改善骨组织代谢和抗糖尿病等生理功能。目前,CLA作为一种天然的功能性脂肪酸被     

共轭亚油酸对蛋鸡蛋品质的研究进展

共轭亚油酸(CLA)是人和动物必需的营养成分之一。本文综述了CLA对鸡蛋蛋重、蛋清、蛋黄的影响,旨在通过介绍CLA对鸡蛋品质的影响,为CLA在蛋鸡生产中的应用及研究提供理论依据。     

共轭亚油酸对鸡生产性能、蛋品质及免疫的影响

共轭亚油酸（conjuga-ted linoleic acid，CLA）是一种新型功能性油脂，具有多种生理功能。文中主要就共轭亚油酸对鸡生长、蛋品质及免疫的作用的研究进展进行综述。     

共轭亚油酸的生物学效应及其在猪生产中的应用

共轭亚油酸(conjugated linoleic acid,CLA)是一组具有共轭双键的亚油酸的各种构象和位置异构体的总称;作为生长促进因子,CLA具有营养重分配、降低脂肪含量、抗癌、抗动脉粥样硬化等生物特性。作者介绍了CLA的来源与制备及其在猪营养中的应用。     

Attitudes of European citizens towards pig production systems

The objective of the study is to map citizen attitudes towards pig meat production systems, and to investigate whether these attitudes associate with pork and pork product consumption. A conjoint experiment was carried out with empirical data collected from 1931 individuals in four European countries with higher-than-average per capita meat consumption (Belgium, Denmark, Poland and Germany). The experiment was based on the following pig farming characteristics: herd size, housing and floor type, efforts to reduce the impact of the production system on the environment, animal feed designed for producing pork with specific fat content, and finally the preferred quality characteristics of the pork end-product. The results of the conjoint analysis were used for a subsequent cluster analysis in order to identify European citizen clusters. Respondents' socio-demographic profile, attitudes towards issues that are expected to influence the way people evaluate pig meat production systems, and consumption frequency of various pork products are used as background information to identify segment profiles. Pork appears to play a substantial role as a part of the diet for most respondents in the four countries of this study. The results of the conjoint experiment at the sample level show that people assigned most importance to animal and environmental well-being as criteria to discriminate between “good” and “bad” pig production practices, despite the fact that their attitudes towards environmental protection, animal welfare and industrial food production were only moderately strong. Moreover, the results of the cluster analysis allowed small-sized, clear-cut clusters of citizens to appear, which pay attention to specific pig farming attributes. In conclusion, attitudes towards environment and nature, animal welfare and the need for an environment-friendly food production were indeed related to citizens' specific attitudes towards pig farming at the cluster level. However, the relationship between citizenship and consumption behaviour was found to be weak. What people think in their role as citizens related to pig production did not appear to significantly influence their pork consumption choices.     

日粮中脂肪酸对羊牛猪肉中长链多不饱和脂肪酸和共轭亚油酸的影响

随着消费者健康意识的提高,越来越多的研究关注提高家养动物肉产品中多不饱和脂肪酸(PUFA)含量,尤其是n-3长链脂肪酸和共轭亚油酸(CLA)在羊、牛、猪肉肌内脂中的含量。研究结果表明通过添加鱼油或鱼粉能提高动物肉中n-3长链脂肪酸含量。富含亚麻油酸(LNA)的日粮能提高肉中LNA、二十碳五烯酸(EPA)和二十二碳五烯酸(DPA)水平,但大部分对肌肉中二十二碳六烯酸(DHA)水平没有影响。然而,在日粮中添加鱼油或鱼粉大部分能提高动物肌肉中DHA含量。大部分研究中提高n-3脂肪酸含量的同时n-6脂肪酸含量下降,这主要归因于试验组日粮中n-6脂肪酸降低。这样刚好可以使肉中两者比例更合理,但对多不饱和脂肪酸与饱和脂肪酸比例没什么影响。饲喂反刍动物富含n-3脂肪酸日粮(亚麻籽或加草料)、鱼油或富含LA的浓缩料可提高肌肉中c9t11CLA含量。牛肉、羊肉中c9t11CLA在总脂中含量介于0.2~1.0 g/100 g,不随营养因素提高到更高。相对应的,在单胃动物日粮中添加混合CLA油则显著提高CLA含量。     

共轭亚油酸的生物学功能及其在动物生产中的应用

共轭亚油酸（CLA）作为一种天然的新型功能性脂肪酸,具有抗高血压、抗癌、抗糖尿病等生物学特性,其发挥不同作用的主要活性异构体不同。近年来,随着CLA人工合成成本的降低及动物营养领域研究的深入,发现CLA既可抑制促炎因子的表达和产生,促进抑炎因子的产生,达到抗炎的效果;又可调控淋巴细胞的增殖和分化、巨噬细胞的活性、促进抗体合成,调节机体体液免疫和细胞免疫,进而增强动物免疫力;CLA还可调节多种核转录因子的表达,影响脂肪酸的摄取和氧化及脂质的合成代谢,从而降低体脂沉积,提高肌内脂肪含量,改变脂肪酸组成,改善肉品质等。因此CLA在畜牧业生产中具有潜在的应用价值和广阔的市场前景。作者主要介绍了CLA在抗炎、免疫功能、脂质代谢和抗氧化等方面的作用,综述了CLA的生物学功能及其在动物生产上的应用研究进展。此外,还探讨了CLA作为饲料添加剂,其合成纯度,在不同种类动物、不同年龄阶段的最适添加量、饲喂方式等问题,旨在为其在动物生产中的合理应用提供理论参考。     

Effects of dietary supplementation with conjugated linoleic acid on fatty acid composition and lipid oxidation in chicken breast meat

We investigated the effects of dietary conjugated linoleic acid (CLA) on fatty acid composition and lipid oxidation in breast meat of broiler chickens. Broiler chickens (28-day-old females) were fed diets containing experimental oils at 20 g/kg diet for 28 days. The experimental oils consisted of either a 2:0, 1:1, or a 0:2 (wt : wt) ratio of safflower oil (high linoleic acid content) to a commercial CLA mixture. In this study, dietary CLA supplementation significantly increased the composition and content of CLA in chicken meat. The predominant CLA in meat from birds with supplemented diets was the cis -9, trans -11 isomer. The proportion of saturated fatty acid in meat significantly increased with increasing CLA supplementation, with a corresponding decrease in monounsaturated fatty acid. Dietary CLA also reduced thiobarbituric acid reactive substances (TBARS) values in raw meat during storage at 4°C for 5 days. These results provide evidence that CLA feeding is a practical strategy not only for adding nutritional benefits to chicken meat but also for improving meat quality including oxidative stability.     

Effects of dietary conjugated linoleic acid on fatty acid composition, lipid oxidation, color, and water-holding capacity of pork loin

The effects of dietary conjugated linoleic acid (CLA) on fatty acid composition, lipid oxidation, and pork quality were investigated. Pigs (n = 20) were fed a diet containing 0, 1, 2.5, or 5% CLA for 4 wk and slaughtered at 105 kg. The longissimus thoracis et lumborum muscle was collected at 24 h postmortem. Pork loin chops (3 cm thick) were packaged aerobically and stored at 4 degrees C for 7 d. Samples were analyzed for ultimate pH, intramuscular fat content, fatty acid composition, thiobarbituric acid-reactive substances, color (L*, a*, b*), and water-holding capacity. Dietary CLA reduced the concentration of linoleic acid and increased CLA concentration in intramuscular fat of pork loin (P < 0.05). The concentration of CLA in muscle was increased with dietary CLA level and did not change during storage. Thiobarbituric acid-reactive substance value of control was higher than that of the CLA-fed groups (P < 0.05). Intramuscular fat content was increased by dietary CLA, and less purge loss was observed with samples from CLA-fed pigs (P < 0.05). Dietary CLA improved the color stability of pork loin during cold storage. After 7 d, lightness (L*) and yellowness (b*) of the 5% CLA-fed group were significantly lower than those of control (P < 0.05). The results indicated that the water-holding capacity of pork loin was increased with increased intramuscular fat content apparently caused by dietary CLA. Also, the data indicated that color stability of pork was improved with inhibition of lipid oxidation and changing of fatty acid composition by dietary CLA.     

松辽黑猪、雷香猪、杜长大白猪肉质性状及肌肉营养成分比较研究

为了比较松辽黑猪、雷香猪、杜长大白猪肉质性状及肌肉营养成分，选取松辽黑猪、雷香猪、杜长大白猪进行屠宰，对肉质性状、肌肉氨基酸及脂肪酸含量进行测定，结果表明：松辽黑猪剪切力、肌内脂肪含量显著高于杜长大白猪（P<0.05），熟肉率显著高于雷香猪（P<0.05），雷香猪剪切力、肌内脂肪含量极显著高于杜长大白猪（P<0.01）；松辽黑猪和雷香猪肌肉中丙氨酸含量极显著高于杜长大白猪（P<0.01），甘氨酸含量松辽黑猪显著高于雷香猪（P<0.05），极显著高于杜长大白猪（P<0.01）；雷香猪亚油酸含量显著低于杜长大白猪（P<0.05）。文章对优质高端黑猪肉生产群体的选择提供了参考。     

共轭亚油酸对动物免疫机能的作用及其应用展望

共轭亚油酸(ConjugatedLinoleicAcid,CLA)属于多不饱和脂肪酸,是必需脂肪酸亚油酸的一组异构体。CLA具有抗肿瘤、抗动脉粥样硬化、抗糖尿病、减少脂肪沉积、增强免疫机能和促生长等广泛的生物学作用。文章综述了共轭亚油酸对动物免疫机能的作用,为进一步开发和利用共轭亚油酸提供依据。     

影响反刍动物产品中共轭亚油酸富集因素的研究进展

共轭亚油酸(CLA)又被称为过瘤胃脂肪酸。近年来,随着CLA对人体健康的重要作用被陆续发现,通过饲养途径如何提高反刍动物产品中CLA含量成为当前动物营养研究领域的热点。本文在查阅国内外CLA最新研究进展的基础上,对影响反刍动物产品中CLA合成的因素加以综述。     

Occurrence of conjugated linoleic acid in ruminant products and its physiological functions

Milk and meat products derived from ruminants contain a mixture of positional and geometric isomers of C_18:2 with conjugated double bonds, and cis‐9, trans‐11C_18:2 (conjugated linoleic acid, CLA) is the predominant isomer. The presence of CLA in ruminant products relates to the biohydrogenation of unsaturated fatty acids by rumen bacteria. Although, it has been suggested that cis‐9, trans‐11 CLA is an intermediate that escapes complete ruminal biohydrogenation of linoleic acid, is absorbed from the digestive tract, and transported to tissues via circulation. Its major source is endogenous biosynthesis involving Δ⁹‐desaturase with trans‐11C_18:1 produced in the rumen as the substrate. CLA has recently been recognized in animal studies as a nutrient that exerts important physiological effects, including anticarcinogenic effects, prevention of cholesterol‐induced atherosclerosis, enhancement of the immune response, reduction in fat accumulation in body, ability to enhance growth promotion, antidiabetic effects and improvement in bone mineralization. The present review focused on the origin of CLA in ruminant products, and the health benefits, metabolism and physiological functions of CLA.