某鸡场白羽肉种鸡腿病发生原因的调查与防控

吉尔吉斯斯坦亚洲之星农业合作园区饲养的几批罗斯308肉种鸡腿病持续发生,占整个饲养期总死淘数的80%以上。为查找腿病发生原因,历时400 d对肉种鸡腿病发生情况进行全程跟踪调查和分析。认为该场种鸡腿病多发主要原因是饲养管理不当和生物安全防控制度不健全引起葡萄球菌和鸡滑液囊支原体感染,并提出了一系列防控措施,在后来饲养的几批肉种鸡中应用。结果显示:肉种鸡腿病发生率由原来的8%～10%降低到了2.3%,死淘率降低了3.1%,种蛋受精率提高了2.3%,显著提高了该企业的经济效益。     

佳和黄父母代肉种鸡饲养管理

近年来,黄羽肉鸡养殖业迅速发展,黄羽肉鸡的育种趋势向着大胸肌和生长快速这两方面发展,在父母代肉种鸡饲养过程中常常出现种公鸡与母鸡体重差别过大,造成受精率下降,饲养管理不当造成体重超标、腿病和母鸡在产蛋高峰后期种蛋受精率迅速下降等问题。我区种鸡场采用育雏期公母分开育雏;育成期混群,公母分饲：产蛋高峰后期逐渐补充公鸡等技术措施,有效提高种公鸡的使用效率,提高了种蛋的受精率。     

肉用种鸡关节炎型葡萄球菌病的诊断

对武汉市某鸡场育成期肉种鸡腿病发生情况进行了连续 4周的观察与数据统计 ,结果表明 ,平均每周因腿病而死淘的鸡只数占该周总死淘鸡数的 35 37%,最高可达 74 39%。随机采取 10只关节肿胀跛行的病鸡进行了葡萄球菌的分离与鉴定 ,结果从病鸡肝脏和关节分离到了金黄色葡萄球菌。此菌对环丙沙星、氟哌酸、头孢三嗪、复方新诺明、新霉素、丁胺卡那霉素、氯霉素、氧氟沙星等药物敏感 ,对四环素、磺胺甲基异唑、红霉素等药物不敏感。     

肉杂鸡饲养的几个关键时期

饲养前期0～10日龄内主要是控制沙门氏菌和大肠杆菌。发病原因817杂交鸡生产是用肉种鸡的公鸡作父本,商品蛋鸡作母本,其母本由于不是种鸡,而是商品蛋鸡,而在蛋鸡     

肉种鸡限制饲喂技术

1．控制生长速度,体重符合标准要求肉鸡采食量多,生长速度快,脂肪沉积能力强。但作为肉种鸡,要求其20周龄达到的理想体重仅为其自由采食情况下的一半左右,如不能成功限饲,则容易使体重超标,产蛋量减少,种蛋合格率下降;公鸡体重过大,腿疾增加,受精困难,受精率低下。     

矮型肉用种鸡生产性能测定

用纯系矮型肉种鸡(公)与正常型星波罗(母)杂交,得到矮小型母鸡(矮星鸡),再与其他品系正常型肉用公鸡交配,即可生产商品代肉仔鸡。生产性能测定结果,矮星鸡和正常型肉用种鸡相比,产蛋提早1周左右,产蛋率高8％—10％,受精率高15％,蛋品质综合指标均符合正常标准,饲养成本减少30％—40％。     

如何做好种公鸡优质饲养管理措施

<正>近年来很多种鸡场在提高肉种鸡受精率的工作中,采用公母鸡分开育雏、育成,混群后公母鸡分饲,产蛋后期补充后备公鸡等措施,使种蛋的受精率、孵化率指标一直保持在一个较高的水平上。现笔者根据实际经验将此措施的具体方法介绍给大家供参考。一、种公鸡的优选公鸡的外生殖器官不很发达,交配时依靠较长的腿胫和平坦的胸部,使双脚可以很稳地抓紧母鸡背部,并贴近前身将尾部弯下,便于把精液准确地输入母鸡泄殖腔的阴道     

肉种鸡的采精与输精技术

<正>随着肉鸡饲养业的不断发展,一些种鸡场已经采取笼养肉用种鸡的方式。肉用种鸡采取笼养后,公母分开,不能自然交配时,人工授精就成为生产受精种蛋的惟一途径。1.采精技术采精时最好2人配合进行,1人保定公鸡,1人采精。保定者从笼中抓出公鸡,左右两手握住公鸡大腿根部,鸡头朝后,身体保持平衡,两腿自然分开,紧贴身体右侧(如果采精者用右手按摩,也可贴身体左侧)。采精者右手中指和无名指夹着集精杯,杯口朝外,     

肉种鸡笼养注意事项

笼养肉种鸡可提高鸡舍利用率80%～100%,减少种公鸡饲养量50%～70%,节约饲料,降低成本,此外,还有利于控制疾病。但如管理不当,易使种蛋合格率降低,甚至产蛋率、种蛋受精率下降。因此,饲养笼养肉种鸡应注意以下环节。     

种公鸡饲养的技术措施

<正>近几年很多种鸡场在提高肉种鸡受精率的工作中,采用公母鸡分开育雏、育成,混群后公母鸡分饲,产蛋后期补充后备公鸡等措施,使种蛋的受精率、孵化率指标一直保持在一个较高的水平上。现将此措施的具体做法和宝贵的经验、教训介绍给大家供参考。1、种公鸡的饲养目标公鸡的外生殖器官不很发达,交配时依靠较长的腿胫和平坦的胸部,使双脚可以很稳地抓紧母鸡背部,并贴近前身将尾部弯下,便于把精液准确地输入母鸡泄殖腔的阴道     

鸡白痢沙门氏菌的分离与鉴定

[目的]探索20日龄雏鸡出现有关节肿胀、拉白色稀粪和少量死亡等症状的疾病病因,为鸡场的疾病诊断和防治提供建议和有效措施。[方法]采集病鸡样品并进行了细菌学检验。通过细菌分离、PCR、生化试验和回鸡试验鉴定出5株鸡白痢沙门氏菌。[结果]用分离株感染SPF雏鸡,能复制出与自然感染一致的病例。[结论]鸡白痢沙门氏菌是造成鸡场该次疾病的主要病原。     

Interferon: production by chick erythrocytes activated by cell fusion

In the presence of Sendai virus inactivated with ultraviolet light, nucleated chick erythrocytes can be fused with several types of human cells to form heterokaryons. Although chick erythrocytes alone cannot be stimulated by Sendai virus to produce interferon, fusion with a human cell (AH-1) which itself may produce human interferon results in heterokaryons in which the erythrocyte genome is activated and chick interferon is produced. When nucleated chick erythrocytes are fused with another type of human cell (HeLa clone S-3) which does not produce human interferon when stimulated, no chick interferon is detectable, despite morphologic changes suggestive of activation of the erythrocyte nuclei.     

廊坊部分地区肉鸡白痢的发病特点调查报告

本调查了肉鸡白痢的发病特点，结果表明，5-14日龄发病率最高，鸡群发病率为9.7%，死亡率为3.4%。结果表明：恩诺沙星对鸡白痢的治愈率为94.4%。     

鸭副粘病毒与H9亚型禽流感病毒双重PCR检测方法的初步建立

通过对GenBank发表的鸭副粘病毒(DPV)和鸭H9亚型禽流感病毒(AIV,H9)基因序列分析,针对保守区分别设计并合成2对特异性引物.通过对扩增条件的优化,建立了检测两种病毒的快速双重PCR方法.结果表明,该检测方法可同时扩增出DPV (363 bp)和H9亚型AIV (732 bp)的特异性片段,而对照DHV、I...     

Overgrowth stimulating factor released from Rous sarcoma cells

An assay is described for a nonzviral factor from the medium of Rous sarcoma cells which stimulates rapid and sustained cellular overgrawth in crowded chick embryo cultures. The factor is nondialyzable and thermnolabile and is released in large amounts several days after the first visible transformation of newly infected chick embryo cells.     

Brain hyaluronidase: changes in activity during chick development

Development of embryonic chick brain is characterized by high levels of hyaluronidase activity and of hyaluronate, both of which decrease rapidly soon after the chick hatches. By analogy to other systems, it is proposed that the sequence of hyaluronate production and its enzymatic removal may have a developmental role in brain formation.     

鸡肾型传染性支气管炎的诊断与防治

甘鸡场鸡发生以呼吸道及肾病变为主的疾病经流行病学调查、病理剖检、病毒分离、电镜观察生物学特性及理化特性试验，血清中和试验，动物回归等确诊为肾型传染性支气管炎。采用分离毒鸡组织灭活苗结合Ａｕｓｔ－Ｔ株灭活油乳苗有效地防治了该病。     

Inductive interactions between human dermis and chick chorionic epithelium

In a study of specificity in mesenchymal-epithelial interactions, human embryonic dermis has been recombined with chick chorionic epithelium and cultured for 7 days on a host chick chorioallantoic membrane. Dermis from the sole of the foot or palm of the hand induces chick chorionic epithelium to form an epidermis that resembles chick rather than human epidermis. Chick epithelium, though it has the capacity to respond to a human dermal stimulus, is limited to forming chick-type tissue. The human dermis was modified in its turn by culture in combination with chick epithelium.     

Hypophyseal control of genetic expression during chick feather and skin differentiation

The normal sequence of molecular events which occurs during feather and skin differentiation in the chick embryo is interrupted by pituitary gland ablation. The characteristic pattern of development is reestablished in hypophysectomized embryos treated with pituitary extract and in hypophysectomized embryos in parabiotic union with their twins within a double-yolked egg. These results suggest that genetic expression in differentiating chick feather and skin after day 12 of incubation is regulated by hormones.     

Eastern equine encephalomyelitis vaccine prepared in cell cultures

Protection tests in guinea pigs indicate that vaccines prepared from virus propagated in chick embryo cell cultures are as effective as the purified whole chick embryo vaccines which are currently used for human immunization against eastern equine encephalomyelitis.