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1.
The aim of this study was to investigate the effect of dietary supplementation with the docosahexaenoic acid (DHA )‐rich microalgae, Aurantiochytrium limacinum (AURA ), on a variety of health and productivity parameters in lactating cows. Twenty‐four cows were blocked by parity and number of days in milk and then randomly assigned to a control (CON ; n  = 12) group with no algal supplementation, or a treatment group (AURA ; n  = 12) provided with 100 g AURA  cow?1 day?1 or 16 g DHA  cow?1 day?1. A variety of health and productivity measurements were taken, and results indicated that supplementation had no negative effects on animal health in terms of somatic cell count, haematological and biochemical blood parameters, while body condition was marginally improved by algal supplementation. No differences were found for the various production parameters measured; however, a tendency towards increased milk production was observed for the AURA group during the final stage of the study (+4.5 kg cow?1 day?1, day 78–84). The fatty acid profile of milk was improved by supplementation, with significantly lower saturated fatty acids, significantly higher omega‐3 fatty acids and an improved omega‐3/omega‐6 ratio observed when compared to the control group. The amount of DHA in the milk of cows provided 105 g AURA  head?1 day?1 was 4.7 mg/100 g milk with a peak transfer efficiency from feed to milk at day 49 of 8.3%. These results indicate that supplementation with 105 g AURA  head?1 day?1 resulted in the successful enrichment of milk with DHA without negatively impacting the health or productivity of the animals.  相似文献   
2.
ABSTRACT

1. The consumption of adequate amounts of the long-chain polyunsaturated omega-3 fatty acids (n-3 LC-PUFA) has been associated with beneficial effects on human health. Eggs are commonly consumed worldwide, and their omega-3 content can be easily altered by changing the diets of laying hens and so represent an important target for enrichment.

2. In this study, the effect of supplementing laying hens with DHA-rich, Aurantiochytrium limacinum at three different inclusion levels was investigated over a 24-week period.

3. Significant increases in egg DHA concentrations were observed after four weeks and were maintained for the duration of the 24-week study. The supplemented eggs in the current study had a DHA content of 82, 101, and 129 mg/yolk when supplemented with 0.25%, 0.5% and 1% treatments, respectively, which meets the EU criteria to be considered ‘high in omega-3?.

4. Using the sustainably grown protist Aurantiochytrium limacinum to supplement layer diets increased the egg DHA concentration and decreased the n-6/n-3 ratio, improving the nutritional value of the eggs for human consumers.  相似文献   
3.
There is an increasing body of evidence of the positive impact of several marine lipids on human health. These compounds, which include ω-3 polyunsaturated fatty acids, have been shown to improve blood lipid profiles and exert anti-inflammatory and cardioprotective effects. The high instability of these compounds to oxidative deterioration and their hydrophobicity have a drastic impact in their pharmacokinetics. Thus, the bioavailability of these compounds may be affected, resulting in their inability to reach the target sites at effective concentrations. In this regard; micro/nanoparticles can offer a wide range of solutions that can prevent the degradation of targeted molecules, increase their absorption, uptake and bioavailability. In this work we will present the options currently available concerning micro- and nanodelivery systems for marine lipids; with emphasis on micro/nanoparticles; such as micro/nanocapsules and emulsions. A wide range of bottom-up approaches using casein, chitosan, cyclodextrins, among others; will be discussed.  相似文献   
4.
5.
梅童鱼头营养成分的研究   总被引:1,自引:0,他引:1  
陆琼烨  邓尚贵 《安徽农业科学》2014,(6):1800-1801,1863
[目的]研究梅童鱼头的营养成分含量。[方法]以梅童鱼头为原料,分析其营养成分并综合评价其营养价值。[结果]梅童鱼头和鱼肉都含有多种维生素、矿物元素和氨基酸,梅童鱼头必需氨基酸含量占总氨基酸含量的37.73%,略低于梅童鱼肉的40.17%;梅童鱼头和鱼肉均含有多种不饱和脂肪酸,但梅童鱼头EPA和DHA的相对含量分别为7.56%和20.42%,较梅童鱼肉的5.81%和19.31%都高。梅童鱼头营养价值较高,可适当精制加工开发为新型的海洋食品。[结论]研究可为梅童鱼的综合利用与高值化开发提供理论依据,对提高海洋生物资源原料利用率、推动水产加工产业技术升级具有积极的作用。  相似文献   
6.
对照分析了光照与避光、有氧与真空包装/充氮包装、常温与高温/冷藏/冷冻等不同条件对DHA微胶囊的稳定性的影响.结果表明:光照、有氧条件、高温等贮藏条件均促进DHA微胶囊的氧化;其中影响DHA微胶囊稳定性的关键因索是隔绝氧气与否.将DHA微胶囊用锡箔袋真空包装,室温下放置8周,POV值仅由初始值1.7meq/kg增加到3.01 meq/kg,DHA保留率降为94.0%,DHA微胶囊的稳定性较好.  相似文献   
7.
Rainbow trout, average weight 185–187 g, were fed feeds containing menhaden oil, canola oil or fish oils (pollock, pink salmon or rockfish) produced from Alaskan seafood processing waste as the added oil for 8 weeks, at which time the fish weighed 391–411 g (average 404 g, pooled SE = 5.7). The fish were previously fed from 75 g average weight fed commercial feed containing poultry oil as the added oil. No significant differences were measured in final weight or feed conversion ratio among dietary treatment groups. Significant differences were found in fillet ω‐3 fatty acid (FA) levels from fish receiving fish oil‐supplemented feeds compared to those from fish receiving feeds containing canola oil. Fillet contents of eicosapentaenoic acid (EPA; 20:5ω3) and decosahexaenoic acid (DHA; 22:6ω3) were highest in the pollock oil treatment group, although all fish oils increased highly unsaturated ω‐3 FA contents (mg 100 g?1) of fillets. Fish oil used through the production cycle was reduced by 25% by supplementing feeds with poultry oil during the middle phase of production (75–175 g) compared to using feeds containing fish oil throughout the production cycle. Fish oils recovered from Alaskan seafood processing waste were suitable alternatives to conventional fish oil as ingredients in rainbow trout production feeds.  相似文献   
8.
以不添加DHA的纯牛奶为对照,研究了不同鱼油来源DHA添加量及添加工艺对牛奶风味的影响。结果表明:DHA的添加对贮藏期内牛奶的酸度基本无影响;随着DHA添加量的增加,全脂和脱脂牛奶样品的鱼腥味逐渐增大,奶香味逐渐减弱,脱脂牛奶的奶香味明显弱于全脂牛奶;贮藏温度越高,牛奶样品的鱼腥味越明显。  相似文献   
9.
DHA的来源及寇氏隐甲藻生产DHA的研究   总被引:3,自引:0,他引:3  
DHA(二十二碳六烯酸)在耍幼儿大脑发育和视力发育中具有非常重要的生理作用,并且具有防治G血管疾病,提高人体免疫力和消炎、抗癌等功能。DHA的来源有多种,在寇氏隐甲藻(Crypthecodinium cohnii)的细胞油脂中,DHA的含量高达30%-50%,而其他多不饱和脂肪酸(PUFAs)含量较少,寇氏隐甲藻可以在添加了有机底物的培养基中高密度发酵,是人体补充DHA的良好来源。  相似文献   
10.
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