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1. Routes of yolk utilisation and some aspects of intestinal digestion and absorption were determined in the hatching poult and compared to the chick. 2. Transfer from yolk to blood was observed pre-hatch and up to 72 h post-hatch. From hatch the transport pattern was similar to the chick. 3. Transport from the yolk sac into the intestine via the yolk stalk was observed up to 120 h after hatch. Secretion was initially to the proximal ileum and reflux occurred, transporting contents to the proximal small intestine and gizzard. Antiperistaltic movements increased after hatch and secretion continued for longer post-hatch than in the chick. 4. In situ uptake of glucose per unit of duodenum did not change with age, whereas uptake of methionine and oleic acid decreased with age. In contrast, in the chick glucose and methionine uptake capacity increased slightly between hatch and 7 d. 5. The lipid class distribution of intestinal contents resembled that of yolk close to hatch, however, some lipolysis was observed in the duodenum. With age the proportion of free fatty acids increased rapidly, first in the duodenum then in the ileum and finally in the caecum. Yolk in the distal small intestine close to hatch did not appear to be utilised. 相似文献
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采用痘病毒和牛痘病毒免疫莱航鸡制备卵黄抗体,分析了不同抗原浓度下抗体滴度的差异,以了解抗体产量受实验鸡生物节律影响的周期性变化.结果显示,在一定剂量窗范围内,免疫效果会随着抗原浓度的增加而加强.但过高的抗原剂量常会较低剂量引起免疫抑制.两次免疫之间,尤其是首次和二次免疫之间,间隔不宜过短,否则容易造成动物体内的免疫记忆,进而影响免疫效果.弗氏完全佐剂较弗氏非完全佐剂佐剂效力更强,但对机体组织伤害较大,两种佐剂先后交叉使用效果更好.卵黄抗体的产量在总体平稳中呈现明显的7 d和60 d生物波动. 相似文献
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降低蛋黄中胆固醇含量的研究 总被引:7,自引:0,他引:7
采用壳聚糖作载体,1,6-己撑二异氰酸酯作交联剂,通过共价键固载β-环糊精。在吸附时间为120min,蛋黄被稀释25倍时,蛋黄中胆固醇脱除达90.8%。β-环糊精/壳聚糖具有较好的重复使用性能,在重复使用5次后,胆固醇脱除率由90.8%下降至81.3%,仅降低了10.5%。测定结果表明,降低胆固醇含量后,鸡蛋的营养价值和性质没有发生明显的变化。 相似文献
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吴华伟 《广东畜牧兽医科技》2004,29(5):9-10
卵黄抗体是当今生物科学研究领域的一项重大发现。母鸡以特定抗原免疫后,能产生相对应的特异性抗体,并将其有效地储存于卵黄中,卵黄中的免疫球蛋白(IgG)称卵黄抗体,又名卵黄免疫球蛋白(IgY)。自Williams等(1962)发现卵黄抗体以来,IgY以其取材方便,制作简单,价格便宜等优点,广泛 相似文献
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对鸡蛋黄碱性磷酸酶的热稳定性和抑制特性进行了测定,结果表明,蛋黄碱性磷酸酶对热不稳定,56℃作用15min其活性丧失55%,易受尿素,左旋咪唑和EDTA抑制,不易受L-苯丙氨酸和L-色氨酸抑制。 相似文献
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卵黄抗体及其在家禽生产中的应用 总被引:1,自引:0,他引:1
1 IgY的性质及特点卵黄抗体(IgY)是禽类B淋巴细胞在抗原物质刺激下所产生,是母鸡将血液中的特异性抗体选择性地(主要是IgG)转移并沉积到卵黄,能与抗原发生特异性反应的一种球蛋白,是禽类在长期进化过程中形成的用于提高雏禽抵抗力的物质[1]. 相似文献
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中国卵黄抗体饲料添加剂的研究进展 总被引:1,自引:0,他引:1
作者综述了中国卵黄抗体作为新型饲料添加剂在仔猪、牛、家禽、犬、虾、蚕等动物生产过程中研发与应用的现状,指出了其工业化生产在安全性、稳定性、单一性、口服局限性及标准化规程中所面临的突出问题,旨在加速中国卵黄抗体产业化进程,使卵黄抗体技术在动物生产中得到广泛的推广应用。 相似文献
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AA肉仔鸡92只,其中80只于出壳12时龄内每只鸡卵黄囊注射[3]-H-烟酸2ci;于注射后的2,4,6,8,10,12.16,20,24,32,48,72,96,120,144和168小时屠宰,共16次,每次5只鸡,测定卵黄囊、肝脏发血液中[3]H-烟酸的含量。另外12只于出壳当日屠宰,测定卵黄囊、肝脏及血液中烟酰胺初始含量。雏鸡卵黄囊注射[3]H-烟酸后,卵黄囊、肝脏及血液中[3]H-烟酸含量下降到最大值的1/2时间分别为11、25和75小时,下降到最大值的1/5时间分别为40、101和163小时。卵黄囊烟酸含量的80%在出壳后2天内被动用。 相似文献
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产蛋鹅卵黄性腹膜炎是由致病性大肠杆菌引起的一种急性传染病,俗称"蛋子瘟"。本病一般是产蛋初期零星发生,至产蛋高峰期发病最多,产蛋停止后本病也停止发生。病产蛋鹅主要表现为产蛋量下降,产畸形蛋、砂皮蛋、软壳蛋,腹部膨大,腹泻,腹膜炎,零星死亡等症状。2011年2月,来宾市某鹅场产蛋鹅发生了该病,经过发病情况调查,临床诊断,病理剖检,实验室检查及防 相似文献
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制备猪繁殖与呼吸综合征病毒高免卵黄抗体,研究其治疗效果。以猪繁殖与呼吸综合征灭活苗免疫产蛋鸡,采用ELISA方法检测卵黄抗体效价,收集高效价卵黄,采用氯仿抽提和硫酸铵盐析法纯化卵黄抗体。ELISA方法测定收集抗体效价为1∶8 000,测定纯化的抗体浓度为7.85mg/mL,微生物学检验及安全性试验表明制备的卵黄抗体安全可靠,人工感染治愈率和临床应用治愈率分别为100%和89.1%,表明制备的卵黄抗体对猪繁殖与呼吸综合征具有显著的治疗效果。 相似文献
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The mass of residual yolk sac expressed as a percentage of initial mass of the egg from which the chick hatched decreased sharply in the first 2 days post-hatching. A gradual reduction occurred between 3 and 10 days after which a sharp decline was noted between 11 and 13 days post-hatching. The highest number of chicks with unabsorbed yolk sac was noted on day 5 post-hatching followed by days 6 and 7. Chick mortality followed the same pattern. The dynamics, causes and clinical consequences of yolk sac utilization are discussed. 相似文献
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Perry MB Angen Ø MacLean LL Lacouture S Kokotovic B Gottschalk M 《Veterinary microbiology》2012,156(3-4):403-410
Atypical Actinobacillus pleuropneumoniae serotype 13 strains present in North America are described here for the first time. Different from serotype 13 strains described in Europe, North America strains are biotype I and antigenically related to both, serotypes 13 and 10. Chemical and structural analysis of the capsular polysaccharide (CPS) and lipopolysaccharide (LPS) of a representative strain revealed that the CPS is almost identical to that of the reference strain of serotype 13, having a slightly higher degree of glycose O-acetylation. However, it produces an O-PS within the LPS antigenically and structurally identical with that of the reference strain of A. pleuropneumoniae serotype 10. The O-PS was characterized as a homopolymer of 1,2 linked β-D-galactofuranosyl residues, a structure unrelated to that of the O-PS produced by the reference strain of serotype 13. Strains from Canada and United States are antigenically, phenotypically and genotypically similar. Animals infected by one of these strains induced antibodies that were detected by a LPS-based ELISA diagnostic test using either the homologous antigen or that of serotype 10. Based on the LPS and toxin profile, these strains might be misidentified as A. pleuropneumoniae serotype 10. 相似文献
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