Good effort Emily! You have addressed all the criteria very well. Slightly more information on Egg fertilisation would have been good. Grade = A-

Embyro Development
Day 1-3: The brain, nervous systems and eyes begin to take form. The head takes shape and blood vessels begin to appear.
Day 4-6: Heart starts beating and the body is starting to take shape. Lungs start working and a tounge is apearing. Legs and wings are forming.
Day 7-9: At least three rows of feather germs appear on the tail. Eyes begin to form and the leg bends at the knee. The egg tooth also starts to appear.
Day 10-12: Claws, flight feathers and comb apear. Claws turn downward and the bottom of it's feet become padded. Scales apear on the bottom of its legs and the ribs form.
Day 13-15: The left and right collar bones form to become the wish bone. The embryo turns the head towards the blunt end on the egg. Scales, and claws are becoming firm.
Day 16-18: The beak turns towards the air cell and the development is almost complete. As the beak breaks the air cell, the lungs begin to function.
Day 19-21: The yolk begins to enter the body cavity and the baby chick takes up the majority of the egg space. It is then fully developed and ready to be born.

Egg Fertilisationexternal image egghatching.GIFThe female chicken will fertilise her eggs when she has mated and when her ovaries are mature. It takes around 21 days for a hen's fertilised egg to hatch and the egg stays inside the chicken for around three days to become fertile.




Incubation
An incubator is a machine that can create the required enviroment for an egg to hatch. The machine helps the embyro when there is no hen because it turns the egg, heats it, cools it and helps the chicken to grow under unatural conditions. The conditions inside the incubator are usually very warm but sometimes cool down when the chickens hatch. These conditions are important because it is replicating the hen sitting on the egg.
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Preparing Eggs for Sale
Preparing the eggs for sale includes receival, re-oiling, quality testing, candling, stamping, grading and packing. Recieval is when trucks that a refrigerated transport the eggs to grading floors for testing and packing. When the eggs get there, they are taken to cool rooms, to keep the fresh until they are packed. The eggs then get sucked up from a suction head and taken to a conveyor belt and are then washed. The cleaning process removes some natural oils and they are then sent to a room where a micro-fine mist of oil recoats the clean egg. They eggs are then quality testedfor egg white height, yolk colour and shell thickness. There are batches of eggs that are tested to has a small idea of what the eggs are like. It is then onto candling where the egg will remain on the conveyor belt until it has passed over a machine which allows us to see inside the egg. They look for defects inside, defects on the shell and any dirt spots. If there are any defects, the egg is removed and used in processed foods. Stamping involves the egg being stamped with a unique code detailing the farm it came from and the day it was processes. Grading weighs the eggs mechanically and are sorted into different shapes and sizes. Then it is up to packing the eggs into the cartons. There are 'best befores' and 'use-by-dates' that are then printed. The eggs are then transported on the conveyor belt and into the truck heading for the markets.

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Layer Chicken Breeds
White Leghorn: Small bodied white bird, good egg-producer, produces white eggs.
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Australorp: Heavy black bird, excellent 'laying' qualities, eggs are creamy-brown, crossed with a White Leghorn.
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Rhode Island Red: Medium sized bird, reddish--black with yellow, lays brown eggs, can be used for maet aswel as laying.
external image rhode-island-red-chicken-0001.jpg

Lice

What are lice?
Lice are found on the skin and the feathers of chickens. They feed on the blood, dry skin and feathers on the chicken. Symptoms of lice can be when the chicken is losing large amounts of feathers and when the chicken itches more than normal. Possible treatments can be lice powder and monthly scanning the skin to make sure there are no lice after treatment.


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Mites

What are mites?
Mites can be found on the chickens body, legs and breasts. They only feed on the chickens at night so this makes it hard to detect them during the day. All mites really so is suck on the chickens blood, leaving the chicken anaemic and at risk of death. Some symptoms include when the chicken will refuse to roost at night, when white crusty scales fall off of the chickens legs and when the chicken has little red scabs over the body. Possible treatments can include mite powder, dipping the legs into a surgical spirit once a week, covering them in vaseline or using a special product such as benzyl benzoate.
external image chicken_lice_eggs1736.jpg