Development of a chick in the Egg
- 18 hours: digestive system starts to appear
- 20 hours: vertebral column starts to appear
- 21 hours: nervous system starts to appear and brain begins to form
- 22 hours: head begins to form
- 23 hours: blood systems begin to form
- 24 hours: eyes begin to form
- 25 hours: heart begins to form
- 35 hours: ear pits begin to form
- 37 hours: amnion starts to appear
- 42 hours: heart begins to beat
- 46 hours: throat begins to form
- 50 hours: amnion begins to form
- 60 hours: nose begins to form
- 62 hours: legs start to appear
- 64 hours: wings start to appear
- 70 hours: allantois begins to form
- Tongue begins to form
- Tail appears
- Toes begin to form
- Circulation is fully functional
- Crop begins to form
- Bones of the legs begin to form
- Sex of the chick is determined
- Reproductive organs begin to form
- Beak and egg-tooth begin to form
- Ribs start to appear
- Gizzard begins to form
- Voluntary movement begins
- Beak and egg-tooth begin to form
- Ribs start to appear
- Gizzard begins to form
- Voluntary movement begins
- Feathers begin to form
- Eye lids begin to form
- Mouth opening appears
- Claws begin to form
- Beak begins to harden
- Comb is visible
- Flight feathers develop
- Beak begins to harden
- Comb is visible
- Flight feathers develop
- Scales appear on the lower legs
- Continual growth
- Body fairly well covered with feathers
- Left and right collar bones join to form the wishbone
- Body fairly well covered with feathers
- Left and right collar bones join to form the wishbone
- The scales, claws, and beak are becoming firm
- Chick is fully covered with feathers
- Albumen is nearly gone and the yolk is more important as nourishment
- Chick turns its beak towards the air cell
- Begins preparation for hatching
- Growth is nearly complete
- Amnion begins to disappear
- Yolk sac begins to enter the body
- Chick occupies all space in the egg except the air cell
- Yolk sac is completely drawn into the body
- Beak breaks through inner shell membrane
- Lungs begin to function and use the air cell for breathing
- Allantois ceases to function and begins to dry up
I agree that sex determination is not at all affected by temperature variations in the incubation process but rather the sex chromosomes. the resulting sex ratios derived from the manipulation of the incubator temperature is more the effect of preferential embryonic mortalitiy on either male or female embryos. At any rate, the article and pictures are very well presented and very informative. However, with regards the incubation process, it is better to take embryonic development in hourly timeframes rather than lump 24 hour segments, hence we discuss incubator and hatching performances based on the number of hours it takes for an egg to become a chick and how wide the hatch "window' is.
Tell me the mechanism of regression of POF....Thnx
Is there any Hormonal role in bird in laying Double yolk egg ?
This is my answer to Dr. Anjum's question about double yolk eggs in the early stages of lay.
First of all this happens both in the layer as well as the broiler strains, but the incidence in Broiler strains which genetecially have higher body weights is higher.
As to the reasons, there are two factors which I am aware of and have actually seen happening:
1. Some of the individuals in a flock which are hyper sensitive to light stimulation tend to poly ovulate and the result is two yolks within the egg. This happens even if the lighting programme is normal. It's just that some birds happen to be reacting to light stimulation rather abnormally. This is the reason why I do not believe that the solution to cut down the incidence of double yolk eggs is to cut down lighting.The incidence will gradually come down as the stimulation pattern within the bird settles down to normal within a few weeks.
2. Birds which have abnormally high body weights have a trendency to lay eggs with two yolks.
Sir kindly give ans to this question...
Why is there more double yolk eggs in early production stage???......plz elaborate it in such way so I could understand easily..........thnx.
Mr Muzafar Hayat Tarar,
Brazil is highly advanced in poultry production and consult a commercial poultry organization at your country who can support you 100% for production of chick at your hatchery- proposed by you for construction. But before start you need to finalize what is your objective - it is commercial production of chicks for sale to other farmer, or you have your own broiler farm for meat production. You will get good number of specialists or poultry persons who know production program.
Survey the market first if you do like to egg production farm or broiler production farm accordingly you may proceed. Production is ok but marketing of produce egg, meet, spent hen, manure etc with your own retail out lets are points to be considered.
Good luck to have such business and it is excellent project and once you are exposed you can get good confidence for good earning. dr m rath
Beautifully explained. Thanks farhan. I was planing for a long time to start a broiler shed but so farI have seen one must hire a specialist to stary this business as its too risky .If u have any frnd who wants a job and is willing to work with me in my new business do let me know . I'm leaving my number if u have any frnd who is in lahore or any person who is specialist in poultry and want to do job at my farm plz let me know 03454222226.and if u r willing thts fine too.
This article is very useful to me because now I am working in poultry industry in technical department.
This article is easy to understand.
Let us wait and see when we can produce the desired sex through environmental manipulation or biotechnology technique . Now it has no scope.If any hatch would show wide variation in sex ratio then there must be droop in hatching percentage possible. Thanks for initiating such topic. Author has given data through review of literature -embryological information through this forum for chicken eggs. HEgg starts with germinal disc(blastoderm) and end as chick through the gestation period specific to chicken. Late hatch and early hatch are common reports due to incubator operation impact and other factors but not sex of chick.
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