Heart rate in developing ostrich embryos

Abstract

1. A non-invasive condenser microphone was used to detect cardiogenic, acoustic pressure changes (acoustocardiogram, ACG) over the eggshell in order to determine embryonic heart rate (HR) of ostriches in a commercial hatchery. 2. HR measured for 36 eggs at 36·3°C was maintained at about 185 bpm during the middle stage of development (days 19 to 23) and then decreased with embryonic development. 3. The daily changes in HR were not related to egg mass, but HR of high water vapour conductance (GspH 2 O) eggs was found to decrease less during the last stages of incubation relative to low and medium GspH 2 O groups. 4. The averaged HR at 80% of incubation period was close to the value predicted from the allometric equation determined previously for embryos of domesticated precocial birds.

Effect of Acute Hypoxia on the Motor Activity and Heart Rate of the 10- and 14-Day Chick Embryo

“…The HR increases during the period from D10 to D14. Other authors earlier observed similar changes during about the same period of development [43,46,47]. In our study, the absolute HR was somewhat higher on D10 and somewhat lower on D14 [43,47].…”

Pulse oximetry: a new way of determining the heart rate in chicken embryos

“…Many publications have dealt with comparisons of well-established methods of HR detection in chicken embryos [5,6,7]. According to Tazawa et al [7] each method has its own advantages and disadvantages.…”

“…According to Tazawa et al [7] each method has its own advantages and disadvantages. The non-invasive methods, acoustocardiography and ballistocardiography, can be used during the second half of incubation [7].…”

“…According to Tazawa et al [7] each method has its own advantages and disadvantages. The non-invasive methods, acoustocardiography and ballistocardiography, can be used during the second half of incubation [7]. Blood pressure measurement as an invasive method is possible from day 3 to day 21 of incubation (D3 to D21) [8].…”

“…Blood pressure measurement as an invasive method is possible from day 3 to day 21 of incubation (D3 to D21) [8]. Semi-invasive methods are impedance cardiography, usable from D3 to D9/10, and electrocardiography (ECG), which can be used during the second half of incubation [4,7].…”