共查询到20条相似文献，搜索用时 421 毫秒
1.
本文旨在论述共轭亚油酸的结构、来源和生理作用,共轭亚油酸对肉鸡生产性能和免疫的影响.共轭亚油酸对蛋鸡生产性能、抗氧化能力和蛋品质的影响,为家禽饲料中添加共轭亚油酸的必要性提供了依据。 相似文献
2.
本文综述了共轭亚油酸的概念、结构、来源及其对猪胴体品质的影响,并指出共轭亚油酸影响猪胴体品质的机理。简单介绍了共轭亚油酸对猪的其他生理作用和共轭亚油酸在今后的应用前景。 相似文献
3.
本文旨在论述共轭亚油酸的结构、来源和生理作用,共轭亚油酸对肉鸡生产性能和免疫的影响.共轭亚油酸对蛋鸡生产性能、抗氧化能力和蛋品质的影响,为家禽饲料中添加共轭亚油酸的必要性提供了依据。 相似文献
4.
共轭亚油酸对猪胴体品质的影响 总被引：1，自引：0，他引：1
本文综述了共轭亚油酸的概念、结构、来源及其对猪胴体品质的影响，并指出共轭亚油酸影响猪胴体品质的机理。简单介绍了共轭亚油酸对猪的其他生理作用和共轭亚油酸在今后的应用前景。 相似文献
5.
6.
改善牛乳脂中共轭亚油酸含量的研究 总被引：1，自引：0，他引：1
自从发现共轭亚油酸特殊的生理作用以来,共轭亚油酸就一直是动物营养、药物及食品等研究领域的一个热点,目前对于含有共轭亚油酸的功能性食品的研究越来越受到关注和重视。文中阐述了现阶段改善牛乳脂中共轭亚油酸含量的各种方法和手段,为以后共轭亚油酸的深入研究提供一些参考。 相似文献
7.
8.
9.
共轭亚油酸的生物学功能 总被引：3，自引：0，他引：3
共轭亚油酸(CLA)是一种非常令人感兴趣的类脂功能性因子,作为营养添加剂,美国、加拿大等国已开始大量用于农业和食品工业。越来越多的研究结果表明,共轭亚油酸具有抑制肿瘤、调节脂质代谢、抑制脂肪沉积、促进生长发育等多种生理功能,共轭亚油酸正成为药物、食品、饲料等研究领域的一个热点。自1999年起全世界每年都要举行一次“共轭亚油酸学术交流会”,据Pariza博士收集资料统计,目前有关共轭亚油酸的研究论文达400余篇。我国对共轭亚油酸的研究已分别列入十五重大科技专项和科技创新基金项目,商业化共轭亚油酸制品正在逐步推向市场。为… 相似文献
10.
共轭亚油酸（CLA）作为一种天然的功能型脂肪酸，具有特殊的生理功能和营养调节作用。早期大量医学研究证明，共轭亚油酸具有抗癌、抗动脉粥样硬化、降低胆固醇、抗氧化、防止糖尿病、缓和免疫副作用等多种生理功能。近年来随着合成共轭亚油酸成本的降低，国内外研究者开始探索共轭亚油酸在畜禽生产中的应用效果，并发现共轭亚油酸可改善饲料利用率、减少脂肪沉积、提高瘦肉率、改善动物产品品质，调节动物免疫机能。因此，共轭亚油酸在动物营养中的作用越来越受到关注，成为动物营养研究的热点。 相似文献
11.
乳脂肪不仅是牛乳的主要成分之一,同时乳脂肪含量也是评价牛乳质量的重要指标。乳脂肪的合成涉及到日粮营养物质通过奶牛机体转化为乳营养成分的复杂生物学过程,受日粮配方、遗传背景、生理状态、瘤胃微生物等多方面的影响。瘤胃微生物可以通过自身合成的酶类对日粮进行降解,进而对乳脂肪合成前体物质的生成和利用起到一定的调节作用,乳脂肪前体物质合成不足可以引起牛乳中乳脂肪含量的降低。现主要阐述乳脂肪的合成机理以及瘤胃微生物对乳脂肪合成前体物质的影响,旨在为提高牛乳中乳脂肪含量提供思路和参考。 相似文献
12.
本试验旨在研究不同饲粮蛋白质和脂肪水平对育成期雄性水貂生长性能及血清生化指标的影响。选取90只60日龄的健康雄性水貂,随机分为6组,每组15个重复,每个重复1只水貂。6组水貂分别饲喂2个蛋白质水平(32%和36%)和3个脂肪水平(10%、20%和30%)的6种试验饲粮。预试期7 d,正试期60 d。结果表明:低蛋白质中脂肪和低蛋白质高脂肪组水貂终末体重和平均日增重均极显著高于低蛋白质低脂肪和高蛋白质高脂肪组(P0.01),且随着饲粮脂肪水平的增加,水貂终末体重和平均日增重呈增加趋势,20%和30%脂肪水平组极显著高于10%脂肪水平组(P0.01)。水貂料重比以低蛋白质高脂肪组最低,显著低于低蛋白质低脂肪和高蛋白质高脂肪组(P0.05)。低蛋白质高脂肪组水貂血清中尿素氮含量极显著低于其他各组(P0.01)。32%蛋白质水平组水貂血清中谷丙转氨酶活性显著高于36%蛋白质水平组(P0.05)。低蛋白质高脂肪和高蛋白质高脂肪组水貂血清中甘油三酯含量显著高于低蛋白质低脂肪组和高蛋白质低脂肪组(P0.05)。随着饲粮脂肪水平的增加,血清中甘油三酯、总胆固醇和高密度脂蛋白含量有升高的趋势,且最高组均为低蛋白质高脂肪组。饲粮蛋白质和脂肪水平的交互作用对水貂生长性能指标及蛋白质和脂类代谢相关血清生化指标的影响均不显著(P0.05)。由此可见,在本试验条件下,当饲粮蛋白质水平为32%、脂肪水平为20%~30%时,饲粮中蛋白质和脂肪的利用率较高,育成期雄性水貂的生长性能较好。 相似文献
13.
Three experienced persons evaluated 158 carcasses 24 h postmortem for USDA yield grade (YG) and quality grade factors, nine subcutaneous (SC) fat indicators, and four intermuscular (IM) fat indicators. Forty sides (YG 1.1 to 3.8) were selected for determination of chemical composition, two measures of cutability, and total IM fat from the round, loin, rib, and chuck. The IM fat estimates at the 12th rib, rib-plate juncture, and 5th rib were correlated with percentage of chemical fat (r = -.72, -.70, and -.55, respectively). Simultaneous consideration of YG factors accounted for 61% of the variation in chemical fat. Substituting the IM fat estimate at the 12th rib for adjusted fat thickness (AFT) in the equation explained 60% of the variation in percentage of chemical fat. An equation containing two IM fat estimates, marbling score and longissimus muscle area explained 68% of the variation in chemical fat. Simultaneous consideration of the YG factors accounted for 59% of the variation in boneless, closely trimmed (6 mm SC fat and no IM fat) retail cuts from the round, loin, rib, and chuck. Substituting the IM fat estimate at the 12th rib for AFT in the equation accounted for 65% of the variation. These data from a fairly uniform set of steer carcasses show that percentage of chemical fat and cutability can be reliably predicted from IM fat estimates and other traits that can be visually estimated on hot-fat trimmed carcasses. 相似文献
14.
哺乳动物脂肪组织主要可以分为白色脂肪组织和褐色脂肪组织,无论细胞形态还是功能,褐色脂肪与白色脂肪都有较大差别。褐色脂肪在哺乳动物产热以及能量平衡方面发挥着重要作用。为探究绵羊褐色脂肪分布特点,本研究采集了出生1、7和30 d苏尼特羊的肾周、颈部、背部、尾部、胸部、腹股沟和心包脂肪,通过HE染色、透射电镜和免疫组织化学鉴定脂肪组织类型,并通过实时荧光定量PCR和Western blot探究苏尼特羔羊不同日龄以及不同部位褐色脂肪的特点。结果发现,苏尼特羔羊体内存在两种不同类型的脂肪细胞,多室小脂滴的褐色脂肪细胞和空泡状脂滴的白色脂肪细胞。褐色脂肪细胞内有嵴的线粒体较多,并检测到褐色脂肪组织特异性蛋白UCP1的表达。而白色脂肪细胞内很少有带规则嵴的线粒体,不表达UCP1。出生1和7 d时褐色脂肪细胞数量及UCP1表达无显著差异,但出生30 d时明显下降。本研究通过形态学观察和标记基因以及蛋白检测鉴定了苏尼特羔羊的褐色脂肪和白色脂肪,证明了肾周脂肪和尾部脂肪分别是褐色脂肪以及白色脂肪的主要来源部位。出生1和7 d时苏尼特羔羊体内褐色脂肪较多,出生30 d时褐色脂肪的表型变化较大,呈现下降的趋势。本文探究了苏尼特羔羊褐色脂肪的特点,为反刍动物褐色脂肪研究提供了一定的基础。 相似文献
15.
Relative development of subcutaneous, intermuscular, and kidney fat in growing pigs with different body compositions 总被引：4，自引：0，他引：4
A total of 94 pigs from seven groups considered as lean (boars from a synthetic line and the Pietrain breed), conventional (boars, gilts, and barrows from the Large White breed), fat (barrows from the Meishan x Large White cross), or obese (Meishan barrows) were serially slaughtered between 12 and 110 kg BW. Carcasses were dissected into muscle, bone, skin, and fat, which was further separated into subcutaneous, intermuscular, and kidney fats. Subcutaneous fat accounted for 60 to 70% of body fat and intermuscular fat for 20 to 35% of body fat. Relative to total fat, intermuscular fat grew more slowly (allometric growth coefficients generally < 1), subcutaneous fat at the same rate (b close to 1), and kidney fat more rapidly (1.12 < b < 1.33). The leaner the animals genetically, the higher the proportion of intermuscular fat in total fat. The ratio of intermuscular to subcutaneous fat varied from .31 in Meishan barrows to .66 in Pietrain boars. Overall, the ratio of intermuscular fat to muscle weight or body weight was positively related to the development of total fat. However, Pietrain pigs were unique in having a high development of intermuscular fat. The present results suggest that 1) the genetic controls of the development of intermuscular and subcutaneous fat are partially independent and 2) the development of intermuscular fat may be determined at an early stage, before 20 kg BW. 相似文献
16.
E B Sonaiya 《British poultry science》1985,26(4):453-458
In two experiments broilers of both sexes from two strains were reared to 16 weeks of age to determine how total body fat could be estimated and predicted from some carcase traits. In the first experiment, age, carcase weight and abdominal fat thickness were found to be significant factors in the prediction of total body fat weight estimated from abdominal fat weight. In the second experiment abdominal fat weight was the best predictor of total body fat weight, obtained by ether extraction of the minced whole carcase. Inclusion of abdominal fat weight in the prediction equation after carcase weight and abdominal fat thickness significantly improved the regression. If the carcase cannot be weighed and abdominal fat weight is not available, because of the more laborious nature of its determination, then the measurement of abdominal fat thickness can be useful in predicting the total body fat content. 相似文献
17.
18.
体脂分布可作为优质肉鸡选育的重要指标.向高肌内脂肪、低腹脂、低皮下脂肪型体脂分布方向进行鸡种选育,是当今优质肉鸡育种工作的紧迫任务.本研究通过测定鸡脂肪在体内的分布情况,并进行了相关性分析,结果表明:不同品系母鸡皮脂率、腹脂率、IMFx含量差异显著(P<0.05),其中腹脂率//IMFx值与腹脂率和皮脂率均呈显著正相关(P<0.05),与IMFx呈极显著负相关(P<0.01),说明这一指标能够在一定程度上反映脂肪在腹部、肌内和皮下的分布状况.因此,确定腹脂率/IMFx值可作为一个有效的指标来衡量优质鸡的体脂分布,即作为优质鸡品系选育及杂交选育的评价指标之一. 相似文献
19.
E J Eisen 《Journal of animal science》1987,64(1):133-147
Correlated responses to selection for rapid 3 to 6-wk postweaning gain in male mice were estimated for five fat depots weighed at specific degrees of maturity in body weight (37.5, 50.0, 62.5, 75, 87.5 and 100%). Fat pads measured were from regions of the subcutaneous hindlimb, subcutaneous forelimb, epididymides, mesentery and kidneys. At the same degree of maturity, selected mice (M16) were older (P less than .01) than controls (ICR). M16 had heavier (P less than .01) fat depots than ICR for all sites at each degree of maturity. From 62.5 to 100% maturity, M16 was larger than ICR in fat depot weight as a percentage of body weight at all sites. Mesenteric fat made up the largest percentage of total fat in both lines and perirenal fat the smallest percentage. Development of degree of maturity in each fat depot relative to degree of maturity in body weight was studied using the constrained quadratic and standardized allometric models. Both models showed similar trends, but the latter identified more significant line differences. The standardized allometric analysis indicated that total fat and all individual fat depots except mesenteric fat matured at a slower rate (P less than .01) in M16 than in ICR. Bivariate allometric analyses of ln fat depot weight on ln body weight showed that M16 exceeded (P less than .01) ICR in relative growth of all fat depots except mesenteric fat; at lower body weights, ICR had larger fat depots than M16, but the reverse was true at higher body weights.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
20.
通过十二烷基硫酸钠-聚丙烯酰氨凝胶电泳(sodium dodecyl sulfate polyacrylamide gel electrophoresis,SDS-PAGE)将人初乳与牛初乳中乳脂肪球膜蛋白进行分离并结合液-质联用技术鉴定,在人初乳乳脂肪球膜蛋白中鉴定出l 076种蛋白质,牛初乳乳脂肪球膜蛋白中鉴定出682种蛋白质,其中人初乳中有757种特异性表达蛋白质,牛初乳中有363种特异性表达蛋白质,两者有319种相同表达蛋白质.通过基因本体(gene ontolpgy,GO)功能注释分析发现,人初乳乳脂肪球膜蛋白在生物过程中发挥的作用高于牛初乳,尤其表现在细胞组成组织功能上;在分子功能上,人初乳乳脂肪球膜蛋白主要体现在结合作用方面:在细胞组成上,与牛初乳乳脂肪球膜蛋白相比人初乳乳脂肪球膜参与的细胞组成均较多,其中在细胞胞内区的组成上参与最多.通过京都基因与基因组百科全书系统(Kyoto Encyclopedia of Genes and Genomes,KEGG)代谢通路分析可知,人初乳乳脂肪球膜蛋白中有15种蛋白参与了与消化吸收相关的KEGG通路-酶酵解. 相似文献