Eggs.

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Presentation transcript:

Eggs

Egg Anatomy

EGGS

Air Cell -Blunt end -Contraction of egg during cooling -Size increases as egg ages

Germinal Disc -genetic information from female -sperm fertilizes egg within the germinal disk -white spot on the yolk

Thick and Thin Albumen -egg white -source of protein

Chalaza -Twisted and cord like - Anchors yolk in center of egg

Shell - Calcium Carbonate -Has pores -Color determined by breed

Shell Membranes -Attached to shell -Encloses contents -Protects albumen from bacteria

Vitelline (Yolk) Membrane - Surrounds and seals in the yolk -thin, elastic

Yolk - Color varies by feed source - Source of vitamins, minerals & fat

Candling Eggs Shining a light through eggs to determine internal characteristics

Freshly laid egg is about 107 degrees- same as hen Egg cools to surrounding temperatures, egg contents shrink, shell remains the same, more pores at the large end of the egg– air enters and fills the space left by shrinking contents Chicken pips through membranes to air cell– first breath of air in this space

Air Cell Increases during incubation Not too small Not too big Chick will be strangled on fluids Not too big Fluids will be dried up and chick will be weak and may stick to the shell

Egg Grading

Grades of Eggs Appearance determines grade External and Internal AA A B Inedible

EGGS AA A B Clean, no cracks, correct shape Albumen tight around yolk Mostly good, clean Albumen a little spread out B Not clean, misshapen Albumen spread out, flat yolk

Jumbo= 30 oz. Extra Large= 27 oz. Large= 24 oz. Classes Ounces of weight/Dozen Eggs Jumbo= 30 oz. Extra Large= 27 oz. Large= 24 oz. Medium= 21 oz. Small= 18 oz. Peewee= 15 oz.

External Clean Shape Cages Scratches Cracks Weak Spots

Internal Candling= shine bright light through egg Identify defects Yolk Color Blood Spots Size of air cell Embryonic development

Blood Spots *Capillary burst in reproductive system *Doesn’t mean embryo is growing

Air Cell Size Larger = older New Eggs= Float Old Eggs= Sink

Egg Grading Videos http://www.youtube.com/watch?v=NDWSnAsWor0&feature=related http://www.youtube.com/watch?v=20inTZvPZP4 http://www.youtube.com/watch?v=BjDQ8QXB7cg&feature=related