Day by day dvelopmment of chich embryo
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Chronology of Chick Embryo (Day by Day development of chick embryo) [Avian Embryology] Course Title: Poultry Breeding & Hatchery Management Course No.: PS-301 Credit Hours: 2(1-2) Name of Teacher: Dr. Nasir Mukhtar, Assistant Professor Poultry Science Department FACULTY OF VETERINARY & ANIMAL SCIENCES
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Transcript of Day by day dvelopmment of chich embryo
Chronology of Chick Embryo
(Day by Day development of chick embryo)
[Avian Embryology]Course Title: Poultry Breeding & Hatchery
ManagementCourse No.: PS-301 Credit Hours: 2(1-2)Name of Teacher: Dr. Nasir Mukhtar,
Assistant ProfessorPoultry Science
DepartmentFACULTY OF VETERINARY & ANIMAL SCIENCESPMAS Arid Agriculture University Rawalpindi-PakIstan
Embryology:-
Embryology is study of development of an organism from time and egg is fertilized until the time when all major organ, systems are formed.
Embryological processes:-Embryological processes involved
1-Fertilization.2-Cleavage3-Blastulaion4-Gasturalation
Different events occur in embryonic development: Before Laying of Egg
Fertilization occurliving cells Division and growthCells Segregation into groups (tissues)
In Between Lying and Incubation:- No growth occur; inactive embryonic life
stage
Contii…
Day One At 25 hours - initiation of ear
Day ThreeAt 60 hours - initiation of noseAt 62 hours - initiation of legs64 hours - initiation of wingsDay Four Initiation of tongueAll body organs are presentThe vascular system is clearly evident to naked eyes
Contii…
Day FiveFormation of reproductive organs takes place
and differentiation of sexHeart begin to take a definite shape &
vascular area of yolk sac covers 2/3 of yolk
Day SixBeginning of beak and egg tooth
Day Seven Rapid development of embryoBody organs ar clearly visible
Contii…
Day EighthInitiation of feather
Day Ten Hardening of beakToes & scales appears on legs
Day Eleven The walls of abdomen appear and intestine
may be seen in yolk
Contii…
Day Thirteen The skeleton is beginning to calcify Most organs are differentiated clearly
Day Fourteen The embryo rotate to take the normal
position (Head toward broader end)
Day Seventeen Embryo rotate to take the right position
(Beak is under right wing)
Contii…
Day Nineteen The yolk sac begin to enter the body cavity The chick rotate to find a position necessary for
Pipping the shell
Day Twenty Yolk sac completely drawn into the body cavityEmbryo occupy all the space within the egg except
the air cell The beak of chick penetrates the inner membranes
and enter the air cell Chick inhales some air and pulmonary respiration
beginsChick pips to shell to gain entrance to outside airAt this time the lungs become fully functional
Contii…
Day twenty onePipping and Muscular movement of embryo
create a circle cut around the whole shell
Hatching of chicks
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