Group Title: Poultry Science mimeograph series
Title: Development of the chicken embryo
Full Citation
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 Material Information
Title: Development of the chicken embryo
Series Title: Poultry Science mimeograph series - Florida Agricultural Experiment Station ; PY69-2
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Voitle, Robert Allen, 1938-
Wilson, Henry R ( Henry Russell )
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville, Fla.
Publication Date: 1969
Copyright Date: 1969
Subject: Chickens -- Embryos -- Florida   ( lcsh )
Chickens -- Breeding -- Florida   ( lcsh )
Genre: bibliography   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Bibliography: Includes bibliographical references (leaf 3).
General Note: Caption title.
General Note: "February, 1969."
Statement of Responsibility: R.A. Voitle and H.R. Wilson.
 Record Information
Bibliographic ID: UF00094228
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 318806250

Full Text

/ 6C Poultry Science
Mimeograph Series No. PY 69-2
FS06 February, 1969; 200 copies
K) (A-au

Before oviposition:


Between oviposition and

Florida Agricultural
Experiment Station
Gainesville, Florida


R. A. Voltle and H. R. Wilson MAR 319

Fertilization F voridi I
Division and gro tVF l ;- Fy ,, 0-
Segregation of cells Into groups
of special function

Several hundred cells

No growth; stage of inactive
embryonic life (If temperature is
kept below physiological zero =800 F).

During incubation:

First Day:
8 hours
18 hours


24 hours

Second Day:
25 hours
30 hours
35 hours
38 hours
42 hours

Third Day:
50 hours

60 hours
62 hours
64 hours
70 hours

Appearance of primitive streak
Appearance of primitive gut-primordial
germ cells appear In germinal crescent
Appearance of vertebral column
Appearance of neural groove
Appearance of somites
Appearance of blood Islands-vitelline
Appearance of eye (6 somites)

Appearance of heart
Appearance of amnion (protection)
Appearance of ear (14 somites)
Cranial flexure and torsion evident
Heart beats-beginning of yolk sac
(19 somites)

Appearance of amnion-chick has
turned on left side
Appearance of nasal pits
Appearance of posterior limb buds
Appearance of anterior limb buds
Appearance of allantois;
(a) embryonic respiratory system
(b) holds kidney excretions
(c) aids in absorption of albumen
by embryo
(d) connected to future cloaca


Fourth Day:

Fifth Day:

Sixth Day:

Appearance of tongue and esophagus

Appearance of proventriculus,
gizzard, reproductive organs and
differentiation of sex

Appearance of beak and egg-tooth-
voluntary movement-duodenal loop

Allantois and chorlon serosaa)
anastomose and lay against shell-
ceca and digits appear

Seventh Day:

Eighth Day:

Ninth Day:

Feather tracts appear

Embryo bird-like In appearance-
growth of allantols nearly complete

Beak begins to harden

Eleventh Day:

Thirteenth Day:

Fourteenth Day:

Fifteenth Day:

Sixteenth Day:

Seventeenth Day:

Eighteenth Day:

Nineteenth Day:

Abdominal walls established, loops
of Intestine are seen hanging in
yolk sac.

Appearance of scales, claws, down
and muscle-cartilaginous skeleton
is complete and ossification is

Embryo turns head toward blunt end
of egg

Small Intestines taken into abdomen

Beak, nails and scales relatively
cornified-albumen practically gone
and yolk increasingly important

Amniotic fluid decreases-head
under right wing with beak toward
air cell

Transfer of embryo to hatching
trays-turning no longer required

Yolk sac begins to enter body
cavity and amniotic fluid disappears
(embryo swallows it)-beak pierces
air cell and lungs function slightly

Tenth Day:


Twentieth Day:

Twenty-first Day:

For information on incubation
following references:

Kalch, L. W. A Small Display
Extension Circular.

Yolk sac drawn completely into
body-pulmonary respiration starts-
allantoic circulation and respiration
cease and allantois dries up

Normal hatching
(a) head under right wing
(b) legs toward head
(c) pipping
(d) shell quite brittle as some
calcium of the shell is used
to build skeleton

and embryonic development consult the

Incubator, 1961. University of Florida

Romanoff, A. L. 1960. The Avian Embryo. The Macmillan Company, New

Patten, B. M. 1964. Foundations of Embryology. Mcgraw-Hill, Inc.
New York, 2nd edition.

Lillie, F. R.

1930. The Development of the Chick. Henry Holt and
New York, 2nd edition, Revised.

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