Comparative study on respiratory and circulatory functions in avian eggs

禽蛋呼吸循环功能的比较研究

基本信息

批准号：
07044110
负责人：
TAZAWA Hiroshi
金额：
$ 1.92万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044110/
关键词：
Noninvasive determination Ostrich eggs Emu eggs Embryonic hear rate Allometric relation Precocial and altricial birds Developmental patterns Eggshell gas conductance 嘴打アコーストカ-ディオグラム鳥類卵ダチョウ牧場心弾動無侵襲計測

项目摘要

1. Developmental patterns of embryonic heart rate (HR) in chickens were determined by impedance-cardiography during day 3-9 of incubation without impeding gas exchange through the eggshell. Additionally, responses of embryonic HR to 10% O_2 and 100% O_2 exponsoures were investigated. In contrast to the marked developmental changes in hypoxic sensitivity of HR,the HR showed little response to hyperoxia, suggesting no hypoxic drive to HR.2. Developmental patterns of HR in ostrich embryos were determined noninvasively by acoustocardiogram (ACG) in relation to eggshell gas conductance (G) and egg mass. They were not related to egg mass. However, embryos of high G eggs had high HR compared with those of low and medium G eggs, despite that they were incubated in a high humidity incubator to maintain adequate water loss from the eggs. Additional experiments mad one year later elucidated that the incubator humidity affected the HR of embryos developming in high G eggs.3. Developmental patterns of HR in emu embryos were also determined by ACG during the last 15 days of artificial incubation. The averaged pattern in 6 embryos was kept at about 170 bpm during the first 5 days of measurement and decreased to about 140 bpm during the remaining 10 days. The ACG could be detected during the assisted external pipping period.4. The allometric relations of embryonic HR with fresh egg mass were determined in precocial (N=9) and altricial and semi-altricial birds (N=20) . The allometric relation of HR at 80% of incubation period in precocial birds was similar to that of maximum HR (i.e., internal or external HR) in altricial birds.5. International symposium on cardiac rhythms in animals was held in Muroran Institute of Technology having 22 overseas participants including two collaborators (Prof. Ar and Prof. Burggren) to conclude and promote further the international scientific research.

1。鸡在鸡肉中的胚胎心率（HR）的发育模式是通过阻抗摄影在第3-9天孵育的情况下确定的，而不会阻碍通过蛋壳换气体的气体交换。此外，研究了胚胎HR对10％O_2和100％O_2指数的响应。与HR低氧灵敏度的明显发育变化相反，人力资源对高氧的反应几乎没有反应，表明对HR.2没有缺氧的驱动。通过听见图（ACG）与蛋壳气体电导（G）和卵子质量无创的HR的发育模式无创确定。它们与卵质量无关。然而，与低和中g鸡蛋相比，高g卵的胚胎具有高HR，尽管将它们在高湿度孵化器中孵育，以维持鸡蛋的足够水分流失。一年后，疯狂的其他实验阐明了孵化器的湿度影响了高g蛋中胚胎的HR。3。在人工孵育的最后15天内，还通过ACG确定了eMU胚胎中HR的发育模式。在测量的前5天，将6个胚胎中的平均模式保持在约170 bpm，并在其余10天内降至约140 bpm。可以在辅助外部拨动期间检测到ACG。4。胚胎HR与新鲜卵质量的异形关系在早体（n = 9），私生和半α鸟（n = 20）中确定。早熟鸟类中HR在80％的孵育期间的HR的异形关系类似于极限鸟类中最大HR（即内部或外部HR）。5。在穆罗兰理工学院举行了22名海外参与者（包括两名合作者（AR教授和Burggren教授），在动物中心脏节奏的国际研讨会，以结束并进一步促进国际科学研究。