共查询到20条相似文献,搜索用时 171 毫秒
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试验是以古典鸡蛋、乌鸡蛋和海兰灰鸡蛋为材料,以常规分析和感官分析方法研究比较3个品种鸡蛋的营养品质与风味品质。试验结果表明,古典鸡蛋的营养品质总评最佳,海兰灰鸡蛋次之,乌鸡蛋最差。3种加工方法 (蒸、煮和炒蛋)风味的感官总评,以古典鸡蛋为最佳,乌鸡蛋次之,海兰灰鸡蛋最差。感官品质与营养品质性状相关性分析表明,蛋的营养品质与烹调和加工方法对鸡蛋的风味影响很大。感官品质与营养品质性状相关性分析表明,炒蛋品质与鸡蛋营养品质中的水分含量相关性最大,蒸蛋品质和煮蛋品质与粗脂肪含量相关性最大。 相似文献
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饲料对肉品风味的影响南京农业大学畜牧系魏臻武风味是肉品质的一个重要方面,消费者对肉的喜爱程度通常由它的风味确定,特别是对牛、羊肉而言。肉品风味是鲜肉在烹煮期间通过水溶性化合物的反应和降解形成的,而特殊的风味主要来源于脂类组织。脂肪也是煮肉时积累的挥发... 相似文献
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鸡蛋品质包括蛋重、蛋壳质量、蛋壳颜色、蛋形指数等鸡蛋的外部品质和蛋白高度、蛋黄颜色、蛋黄膜强度、化学成分、功能特性、血斑和肉斑、风味等内部品质。生产者和消费者最关注的鸡蛋品质是蛋重、蛋壳品质、蛋黄颜色和功能特性。近年来,随着人们生活水平的提高和高龄社会的到来, 相似文献
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食用禽加工处理与禽肉品质 总被引:1,自引:0,他引:1
食用禽加工处理与禽肉品质汪尧春呙于明(中国农业大学动物科技学院北京100094)综述前言近年来,消费者对禽肉的品质,诸如颜色、嫩度、风味等提出了愈来愈高的要求。由于肉仔鸡的选择以生长速度为主要指标,肉质非但没有提高,反而有所下降。淘汰母禽是蛋禽业的副... 相似文献
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维生素与矿物元素对猪肉品质的影响 总被引:2,自引:0,他引:2
随着生活水平的提高,人们对动物性食品保健意识的增强,对猪肉品质的要求也在不断发生变化。消费者喜欢瘦肉率高,脂肪和胆固醇含量低的猪肉,同时又要求它的色泽好、嫩度高、多汁、风味鲜美、不饱和脂肪酸含量适当。本文集中讨论几种维生素和矿物元素对猪肉品质的影响,从营养调控的角度提出改善肉品质的措施。 1 维生素E 现代饲养条件下,猪肉不饱和脂肪酸含量的提高直接导致猪肉品质下降,不饱和脂肪酸氧化酸败产生醛类、酮类和醇类组 相似文献
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干酪品质的改进--常见缺陷的产生与控制 总被引:1,自引:0,他引:1
消费者总是希望干酪具有优良的品质和独特的风味,为此,对干酪生产过程中导致干酪品质异常的一些常见原因,从物理、化学、微生物学三方面进行了分析。 相似文献
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沈明军 《国外畜牧学(猪与禽)》2009,(4):67-69
随着人们生活水平的提高,消费者不仅需要瘦肉多,也希望猪肉品质优良。“安全肉”生产仅仅解决了猪肉中有毒有害物质的残留问题,但不能解决猪肉的色淡、味差等品质问题。所谓肉的风味是肉的滋味和香味的综合特征,肌肉中有大量的风味前体物质,它们在加热过程中发生一系列化学反应,从而形成风味。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献