Read the summary and the most important questions on Reader Biology of Domestic Animals

• 1 Egg

• 1.1.1 Function of the egg

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• What is the function of the egg?

  To provide a closed environment and the nutrients for an (bird)embryo to develop.

• what are oviparous species?

  The females lay eggs from which the young later emerges. Most species that live in the water, most insects and reptiles and all birds

• What are Ovoviviparous species?

  species that produce eggs with a yolk that develop further within the female’s reproductive organs.

• 1.1.2 Egg production

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• What was the first industrial housing system for egg production?

  The battery cage, before this chickens could roam around freely.

• 1.1.3 Structure off eggs

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• What is the function of the germinal disk?

  ALways faces upwards regardless of te eggs position.

• 1.1.4 The chemical composition of the egg

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• What is the most common protein in the egg white?

  Ovalbium, this lends a firm structure to cakes and custard when used in food.

• What does the yolk mostly consist of?

  Lipids, saturated fatty acid chains,, phospholipids, cholesterol and proteins.

• 1.1.5 Quality of eggs

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• What characteristics are checked for external egg quality? 3

  1. Size and weight
  2. Shape and appearance, egg shape is determined by the shape index, appearance is the colour and purity of the shell.
  3. Shell strength, is important because almost 7% of the eggs are lost due to breakage.

• What characteristics are checked for internal egg quality? 3

  1. Yolk colour, depends on customers wishes.
  2. Blood and meat spots, they are found undesirable by the customer.
  3. Quality of egg white, layer of thick white close to the yolk and an edge of thin white further out. Thick white is measure whith Haugh Units.

• 1.2.1 Formation of the egg

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• What does tthe procustion process for an egg depend on?

  Hormone synchronisation and balances.