38) Breeding methods and mating systems, interspecies hybrids

Question 1

Mating system

Answer 1

• Used by producers
• Ensure certain traits transmit from parent to offspring

Question 2

Breeding method types

Answer 2

• Purebred
• Crossbreeding

Question 3

Purebred

Answer 3

• Inbreeding
• Line breeding
• Outbreeding
• Refreshment of blood

Question 4

Crossbreeding

Answer 4

• Breeding:
  
  • Stocks
  • Livestock
• Cross different:
  
  • Breeds
  • Lines
• Form new combination of traits

Question 5

Crossbreeding methods

Answer 5

• Genetic refreshment
• Breed improvement
• Grading up: change a whole breeding stock
• Direct method
• Indirect method
• Several breeds

Question 6

Aim of crossbreeding

Answer 6

• Aim to increase:
  
  • Performance of herd
  • Hybrid vigour

Question 7

Direct crossbreeding method

Answer 7

• Whole crossbred animals
• F1 are the end-product

Question 8

Indirect crossbreeding

Answer 8

• Back-crossing:
  
  • Crossbred F1 mated by ancestral breed
• Crisscross:
  
  • Crossbred females mated with pure males of two different breeds

Question 9

Interspecies hybrids

Answer 9

• One of the oldest: The Mule
• Liger
• Dogs are often mix-breeds