共查询到20条相似文献，搜索用时 78 毫秒
1.
1. The fermentation of poultry manure in an attempt to increase its value for poultry diets was studied. 2. Microbial strains for the efficient elimination of uric acid were isolated. 3. Suitable, cheap carbon sources (methanol, glycerol, glucose) were tested in attempts to increase cell yield. 4. These criteria were used to study the 41 bacterial and 8 yeast strains which were the most prolific on slants and which were isolated from experiments with a shaker. A strain was selected for experimentation with a fermentor. 5. Fermentor experiments were done on a laboratory scale (101) and in a non‐sterile semicontinuous system (150 1), cell mass production being similar in both systems. 相似文献
2.
Five hundred sixty-nine Salmonella were isolated out of 4745 samples from poultry products, poultry, and poultry environment in 1999 and 2000 from the Pacific northwest. These Salmonella were identified to their exact source, and some were serogrouped, serotyped, phage typed, and tested for antibiotic sensitivity. Food product samples tested included rinse water of spent hens and broilers and chicken ground meat. Poultry environment samples were hatchery fluff from the hatcheries where eggs of grandparent broiler breeders or parent broiler breeder eggs were hatched and drag swabs from poultry houses. Diagnostic samples were of liver or yolk sac contents collected at necropsy from the young chicks received in the laboratory. Of these samples tested, 569 were Salmonella positive (11.99%). Ninety-two Salmonella were serogrouped with polyvalent somatic antisera A-I and the polymerase chain reaction. Somatic serogroups B and C comprised 95.25% of all the Salmonella. Out of a total of 569 positive samples, 97 isolates of Salmonella were serotyped. A total of 16 serotypes and an unnamed Salmonella belonging to serogroup C1 were identified. The Salmonella serotypes were heidelberg (25.77%); kentucky (21.64%); montevideo (11.34%); hadar and enteritidis (5.15% each); infantis, typhimurium, ohio, and thompson (4.12% each); mbandaka and cerro (3.09% each); senftenberg (2.06%); berta, istanbul, indiana, and saintpaul (1.03% each); and an unnamed monomorphic Salmonella (2.06%). Ninety-two Salmonella were tested for drug sensitivity with nine different antimicrobials. All of the 92 Salmonella were resistant to erythromycin, lincomycin, and penicillin except one sample (S. berta), which was moderately sensitive to penicillin. All of the tested Salmonella were susceptible to sarafloxacin and ceftiofur. The percentages of Salmonella susceptible to sulfamethoxazole-trimethoprim, gentamicin, triple sulfa, and tetracycline were 97.83%, 92.39%, 86.96%, and 82.61%, respectively. 相似文献
3.
通过本文的介绍，不难发现养禽业作为畜牧业中集约化程度最高的一个行业，其 生产的一体化程度随着时代和科技的发展不断地提高，国家之间、企业之间的竞争也变得更 加激烈。养禽业在经历了发展的高潮和低谷之后正变得更加的成熟，那些生产水平低下，经 济效益差的企业正逐步被市场所淘汰，资金、人才等资源进一步集中到了一些更具竞争力的 企业的手中，这些企业拥有高效的生产管理系统，高度集约化的生产以及宝贵的市场资源。 通过企业间的联合、兼并和收购，这些在竞争中处于领先地位的企业对本国养禽业产生了巨 大的影响，他们在各自的生产领域中起到了举足轻重的作用。我们有理由相信，未来的中国 家禽业也一定会更具有竞争力，并在国际大公司和集团之间竞争的推动下，迈向新的辉煌。 相似文献
5.
(续上期)
2.2德国的家禽生产
最近的统计数据显示,1999年德国禽肉生产总量为80.68万吨,加上进出口部分,总量为124.87万吨,自给率大约为65%.1999年德国肉鸡的产量为43.82万吨,与1998年的44.44万吨相比略有下降,而总的消费量为65.51万吨,与1998年的65.38万吨相比继续缓慢而稳步的上升.1994年德国鸡肉的平均消费量人均7.0公斤,1997年人均7.8公斤,1998年人均为8.0公斤,1999年仍保持在这一水平上.德国国内禽类加工厂的肉鸡加工量达到了37.86万吨,与1998年的36.46万吨相比略有上升.德国肉鸡生产主要由一些大型的集团所控制,德国排名前三位的肉鸡生产公司的总产量占了整个肉鸡生产的90%.具体情况如表5. 相似文献
6.
最近50年来在家禽营养领域中取得了令人难以置信的成就，养禽业也发展成为一个完整的生产体系，一个最有成效的高品质产品的生产体系。 相似文献
11.
1. Studies on the survival of Salmonella enteritidis in poultry units and food were carried out over a two‐year period. 2. The organism persisted for at least one year in an empty trial house at the laboratory in which naturally‐infected broiler breeder birds had previously been housed. A similar survival period was seen in a building which had housed an infected layer breeder flock, although infection was not detected in a subsequent pullet flock. 3. Salmonella enteritidis was also frequently found surviving outside poultry houses in small pockets of litter and fan dust which had been left after cleansing and disinfection of the site. On some poultry units S. enteritidis was also found in wild bird droppings. 4. Salmonella contamination appeared to persist preferentially in association with dust particles swept from the floor and in food troughs and S. enteritidis survived at least 26 months in artificially contaminated poultry food. 相似文献
18.
<正>一旦掌握孵化相关的步骤和技术之后(虽然一开始看上去并不是如此),鸡蛋的孵化过程相对来说就很简单。其他家禽品种诸如火鸡、水禽的孵化步骤与鸡类似,不过在孵化时间和适用条件方面存在些许差异。本文着重鸡蛋孵化应注意的事项。 相似文献
20.
An investigation of the incidence and types of clostridia was carried out as part of a bacteriological examination of poultry carcasses and plant swabs. From 19 per cent to 35 per cent of chicken carcasses from four processing plants were contaminated with clostridia in the “total” differential reinforced clostridial medium count whereas 27–5 per cent to 83–5 per cent were contaminated with clostridial spores. Swabs of equipment and personnel (hands and aprons) in three of the plants showed that from 15 per cent to 75 per cent of the samples were positive for “ total” clostridia, and from 33 per cent to 85 per cent positive for clostridial spores. Clostridium welchii was recovered from all poultry plants but the incidence varied widely between the four plants sampled. The organisms isolated were Cl. bifermentans, Cl. histolyticum, Cl. butyricum, Cl. sporogenes and Cl. welchii. The majority of Cl. welchii isolates were from spore counts. 相似文献
|
