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Principles of Poultry Science

by: Claud Tromp

Principles of Poultry Science ANSC 2271

Marketplace > University of Connecticut > Animal Science > ANSC 2271 > Principles of Poultry Science
Claud Tromp
GPA 3.68

Michael Darre

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Michael Darre
Class Notes
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This 2 page Class Notes was uploaded by Claud Tromp on Thursday September 17, 2015. The Class Notes belongs to ANSC 2271 at University of Connecticut taught by Michael Darre in Fall. Since its upload, it has received 30 views. For similar materials see /class/205846/ansc-2271-university-of-connecticut in Animal Science at University of Connecticut.


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Date Created: 09/17/15
Lecture 8 Principles of Incubation219 13 A clutch of eggs refers to the group of eggs a hen lays and it usually consists of 1014 eggs The hen lays the egg at body temperature 105 degrees and the eggs go into a dormant state until she decides to nally sit on all of the eggs and this allows them to all hatch at the same time because she can only lay on egg a day How long can eggs stay in their dormant state while maintaining hatchability After 15 days we see a decrease in hatchability At about 30 days there s 10 hatchability Commercially they try to collect eggs between 1215 days For incubation we need to supply heat 99100 degrees moisture humidity 5560 relative humidity turning Latent Heat of Evaporation water being changed from a liquid to a vapor state when water evaporates off your skin after a shower etc the water uses the heat from your skin energy to transfer states The water doesn t change temperature just states The higher the ambient temperature the greater the capacity to hold moisture This is because the molecules spin and move around and allow more room for more molecules During incubation you need to lose 1215 of the egg weight between days l18 You are mostly losing water by controlling the rate of evaporation Humidity softens the egg shell and makes it easier for the bird to hatch A hen actually rotates her eggs back and forth just by moving and adjusting on them This increases hatchability because the membrane isn t allowed to attach itself to any one side of the egg You should always turn an egg an odd number of times because at night it will always be on the opposite side There is such a thing as cold temperature incubation Mold in a refrigerator is an example of this When a hen becomes Broody her ability to lay eggs comes to a halt This is not ideal for commercial producers This is why they made incubation in the first place to keep her laying They are also long day breeders and sunlight can be manipulated to keep them laying To keep her eggs moist she dribbles water from her beak down to her breast feathers 1915 First Forced Draft Incubator You can stop turning around day 1416 if you really want to Up to 18 days in the incubator and 3 or 4 days in the hatcher room InOvovacGiving injections into the embryonic sac around the embryo win an egg Drills a little hole puts the needle thru etcetc and then sanitizes everything before the next shell This is a machine 9095 chicks in the Chick Room or something see recording We hatch 1 million bmilzr chicks every hour in the as Lecmre 9 Avian Emb ryn Yolk ohm Membrane Albumen white Chalame Inner Membrane Semi nal Disk SM Vnamne Membrane What happens to the cuticle during mCubaLlOn7 Cuneie starts w melt and wear away so that oxygen can gem Lhru the pores Exha embryonic membranes are extra membranes that gow Inside Thousands ofmuscle cells per nerve cell In the eye It IS 3 1 or z 1 theyare u mam PoikiloLhamic h m Vhprmi


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