共查询到17条相似文献，搜索用时 109 毫秒
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为评价羊驼肉的食用品质,试验采集9头羊驼肉作为样本,测定了羊驼肉肌红蛋白、系水率、蒸煮损失、剪切力、胶原蛋白、水分含量、粗蛋白、肌内脂肪和粗灰分的含量,初步建立了评定羊驼肉品质的方法。结果表明:羊驼肉的肌红蛋白、系水率、剪切力、胶原蛋白、蛋白质和肌内脂肪含量分别为8.2×10-2μmol/g、75.8%、4.7kg、3.4mg/g、25.6%、0.4%,羊驼肉中肌红蛋白含量低于牛肉;肉品的系水率较高,持水性较强,嫩度较猪肉差,但远优于牛肉;羊驼肉蛋白质和矿物质含量明显高于猪肉、牛肉,但肌内脂肪含量较低。总之,羊驼肉是一种优质的肉类资源,大有利用和开发前景。 相似文献
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<正>犬猫等小动物B超诊断工作在我国尚处起步阶段,和发达国家之间仍有一定差距。但就目前小动物的发展来看,这一新的诊断手段有着广阔的应用和发展前景。B型超声诊断是快速、准确、无损伤且又形象直观的先进诊断方法[1]。在许多产科疾病和内科疾病的诊断中充分显示了其优越性,为外科手术的进行提供了直观、可靠的依据。但是B超诊断也有其局限性和不足之处,如B超不能检查含气器官(如 相似文献
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Samples of 45 brands of liming materials were obtained in Thailand and analyzed for chemical and physical properties. Eight of 10 products sold as ground calcium carbonate (calcitic agricultural limestone) were properly identified by vendors and of high quality, that is, neutralizing value and fineness rating above 85%. Seven of 15 products sold as ground dolomite (dolomitic agricultural limestone) were properly identified, seven were ordinary pulverized limestone instead of dolomite, and one was lime. The seven dolomitic agricultural limestone samples were of high quality, that is, fineness ratings above 85% and neutralizing values above 95%. Only two of eight misidentified samples were of high quality. Only one of four products sold as marl had neutralizing value and efficiency rating above 85%, but all were properly identified. Five products sold as crushed seashell had been burned and should have been identified as lime. However, neutralizing values (72–103%) were lower than those of good quality lime. All 13 samples sold as lime were properly identified, and eight were of good quality, that is, neutralizing value above 120% and fineness rating above 85%. The cost of liming materials ranged from US$ 0.01 to 0.20kg–1 for marl and from US$ 0.10 to 0.14kg–1 for lime. There was no relationship between product quality and cost. Fish and shrimp farmers in Thailand should insist that manufacturers and vendors of liming materials provide data on product composition. 相似文献
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A field survey was carried out to study the occurrence and distribution of viruses causing diseases of major impact in fish farming, namely viral haemorrhagic septicaemia (VHS), infectious haematopoietic necrosis (IHN) and infectious pancreatic necrosis (IPN) in farmed and wild fish in Switzerland. The presence of VHS virus (VHSV), IHN virus (IHNV) and IPN virus (IPNV) in the tissue samples was tested by virus isolation in cell cultures, and subsequent virus identification by immunofluorescence. The sera were screened for anti-VHSV antibodies (VHSV-AB) using a serum plaque neutralization test with complement addition. These data were then compared with results of a similar survey performed in 1984/85, and with data from routine diagnostic work completed at the Centre for Fish and Wildlife Health (FIWI) of the University of Bern from 1978 to 2001. Sampling sites included private and government fish farms as well as natural habitats from all major river catchments in Switzerland. In 2000/01, 522 tissue samples and 1910 sera were collected from 3400 fish. In 1984/85 1239 tissue samples and 694 sera were collected from 1628 fish. During the last 24 years of routine diagnostics at the FIWI, 1776 tissue samples were examined for presence of viruses. The results of the tissue analysis from the surveys in 1984/85 and 2000/01 showed low numbers of sites with virus-positive fish (five VHSV, three IPNV and three VHSV, one IPNV, respectively) in Swiss fish farms and rivers. The sites with virus-positive fish were located throughout the country. The decline in virus-positive cases observed between the two surveys agrees with data from the routine diagnostic work of the FIWI which show a decrease in total virus isolations from approximately 35 cases per year in the late 1970s, to approximately 10 cases per year during the last 10 years. However, in 1984/85 8.3% (58 of 694 serum samples) and in 2000/01 6.3% (121 of 1910 serum samples) proved to be positive for VHSV-AB. The 58 positive samples in 1984/85 originated from 40 of 175 sites (23%) and the 121 positive samples in 2000/01 were from 84 of 217 (29%) sites. These results are indicative of a wider distribution of VHSV than expected from the results of the virus isolations. 相似文献
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Franz Lahnsteiner 《Aquaculture Research》2007,38(2):131-139
By use of sodium dodecyl sulfate polyacrylamide gel electrophoresis, ovarian fluid proteins and main proteins of unfertilized eggs were qualitatively and quantitatively investigated in the brown trout, Salmo trutta, to see whether some of them were correlated with the rate of embryos reaching the eyed embryo stage. In the ovarian fluid, 12 types of proteins in the range of 39–166 kDa were detected whereby three proteins were lipoproteins and two were glycoproteins. Ovarian fluid proteins with a molecular weight of 85, 68, 62 and 39 kDa were negatively correlated with the percentage of eyed stage embryos. The statistical significance of the relations was low in simple and multiple regression models (R2≤0.534) indicating that the relations were influenced and superposed by other factors. Therefore, ovarian fluid proteins give only poor information about maturity and quality of eggs. In the eggs, nine major types of proteins in the range of 95–15 kDa were identified. The 95 kDa protein was a lipoprotein, the 85 and the 62 kDa protein were glycoproteins, and the 15 kDa protein was a phosphoprotein. The 95, 85, 77 and 39 kDa protein were positively correlated with embryo survival to the eyed embryo stage. The explanatory effect of the multiple regression model was very high (R2=0.961) indicating that distinct egg proteins are closely related with egg quality. 相似文献
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不同交配、越冬方式对河蟹育苗产量有着显著的影响，三年的生产实践表明：秋季室外土池交配的抱卵率、抱卵量明显高于水泥交配；秋季交配优于春季交配；室外土池自然越冬抱卵卵蟹的胚胎发育优于室外塑料大棚保温越冬的抱卵蟹。适宜的秋，春交配有利于河蟹多苗育苗，延长生长期，增加产量。 相似文献
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九龙江口春秋季鱼类种类组成及数量分布特征 总被引：1，自引：0，他引：1
根据2013年春季（4月）和秋季（11月）在九龙江口开展的鱼类资源调查资料,分析该海域鱼类的种类组成、区系特点和数量分布的季节变化等。调查结果显示,九龙江口春秋季鱼类有41种,隶属于11目25科35属,其中以鲈形目最多,有19种,占鱼类总种数的46.3%;调查海域鱼类适温性以暖水性种类为主（占65.9%）、分布水层以底层和近底层种类（合占85.4%）居多;春季优势种有条纹斑竹鲨（ Chiloscyllium plagiosum ）、叫姑鱼（ Johnius belengerii）、粒突鳞鲬（ Onigocia tuberculatus）和半滑舌鳎（ Cynoglossus semilaevis）,秋季优势种有条纹斑竹鲨、何氏鳐（ Raja hollandi）、小眼魟（ Dasyatis microphthalmus）、凤鲚（ Coilia mystus）、半滑舌鳎和焦氏舌鳎（ Cynoglossus joyneri）,春秋季优势种均以经济鱼种为主。调查海域春秋季的鱼类渔获率分别为4.85 kg/h和6.40 kg/h。春秋季的鱼类生物量均以峿屿岛附近海域为高。 相似文献