Chick embryo heart rate during the last week of incubation: Population studies

Laughlin, K. F.; Lundy, H.; Tait, J A

doi:10.1080/00071667608416279

Cited by 37 publications

(5 citation statements)

References 19 publications

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“…During the same incubation period Antoni and Diliger (1981) obtained similar results, while Laughlin et al (1975) and Cain et al (1967) recorded the number of heartbeats to decrease. As embryonic development went on (a�er 16 days of incubation), similarly like Laughlin et al (1975) and Cain et al (1967) we observed the frequency of heart work to drop from 215 to 205 contractions per minute, while the lowest values (161 per minute) were recorded on the last day of incubation when all eggs were pipped (Table 1).…”

Section: Resultssupporting

confidence: 65%

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Non-invasive measurement of chick embryo cardiac work

Pawlak¹,

Niedzioka²

2004

CZECH J ANIM SCI

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This study used a non-invasive method of ballistocardiography to investigate cardiac work of chick embryos. In this method, an eggshell with electric charges on it is one capacitor plate, the other being a receiving antenna of the measuring equipment. Chick embryo cardiac work induces micro-movements of the whole egg, resulting in changes in the distances between the plates and thus in the difference of potentials between the shell and the receiving antenna. This is registered by the measuring equipment. The first single signals of cardiac work were registered on day 7 of incubation. Starting from day 9, the signal was recorded from all embryos. During the study, the heart rate decreased from 248 to 161 beats per minute and signal amplitude was found to steadily increase from 6.3 to 432.7 mV/m. Great disturbances in ballistocardiograms were observed on days preceding embryonic deaths.

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Section: Resultssupporting

confidence: 65%

“…Laughlin et al (1975) reported that during pipping, the heart rate increases to 270 contractions per minute.…”

Section: Resultsmentioning

confidence: 99%

Non-invasive measurement of chick embryo cardiac work

Pawlak¹,

Niedzioka²

2004

CZECH J ANIM SCI

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“…We were interested in measuring the embryonic HR during normal incubation of the largest living bird in terms of its developmental pattern and allometric relationship with egg mass. The developmental patterns of prenatal HR of domesticated precocial birds show a trend to decrease towards pipping time (Laughlin et al, 1976;Tazawa et al, 1991). Thus it was predicted that the daily HR of ostrich embryos would also decrease during the last stages of incubation and mean HR would be around 160 beats/min.…”

Section: Introductionmentioning

confidence: 98%

Heart rate in developing ostrich embryos

Tazawa

Pearson

et al. 1998

British Poultry Science

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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.

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“…In domestic chicks and Japanese quail, heart rate increases during the 24 hr prior to hatching and may be an influential factor in the hatching process (Laughlin, Lundy, & Tait, 1976;Ockleford & Vince, 1977). Previous research indicates that exposing turkeys and leopard geckos to light accelerates hatching time (Fairchild & Christensen, 2000;Sleigh & Birchard, 2001).…”

Section: Discussionmentioning

confidence: 97%

Effects of prenatal visual stimulation on growth and heart rate in bobwhite quail (Colinus virginianus)

Sleigh

Birchard

2006

Dev. Psychobiol.

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This study examined the effects of prenatal visual stimulation on bobwhite quail embryos' growth and heart rate. No differences in growth rate were found between embryos exposed to visual stimulation during the late prenatal period and control embryos. Embryos exposed to visual stimulation throughout incubation maintained lower heart rates in response to visual stimulation than did naïve embryos. In a subsequent experiment, naïve embryos that underwent an egg-opening procedure exhibited heart rates that were lower than embryos measured in intact eggshells. Embryos in opened eggs maintained lower heart rates than comparison embryos across time; however, a less invasive egg-opening procedure led to a quicker heart rate recovery than did a more invasive egg-opening procedure. These findings indicate that prenatal heart rate responses may be mediated by multiple features of the organism's developmental context, including intensity and duration of sensory stimulation.

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Chick embryo heart rate during the last week of incubation: Population studies

Cited by 37 publications

References 19 publications

Non-invasive measurement of chick embryo cardiac work

Non-invasive measurement of chick embryo cardiac work

Heart rate in developing ostrich embryos

Effects of prenatal visual stimulation on growth and heart rate in bobwhite quail (Colinus virginianus)

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