58) Gene diagnosis in animal breeding and vet.med: meat and fat production genes

Question 1

Marbling

Answer 1

• Beef cattle
• Intramuscular fat
• Enhanced flavour + tenderness

Question 2

List the meat and fat production genes

Answer 2

• MC4R-gene
• Myogenin gene
• IGF gene complex
• H-FABP

Question 3

MC4R-gene

Answer 3

• Melanocortin receptor gene
• Effect:
  
  • Growth
  • Daily gain
  • Fat deposition + mobilisation
  • Lipid consumption of muscles + fat
  • Fat thickness

Question 4

Myogenin gene

Answer 4

• Regulates myogenesis
• Better lean meat ration
• Higher birth + slaughter weight
• Lower back fat thickness

Question 5

IGF gene complex

Answer 5

• Insulin-like growth factor
• Fetal growth + development
• Meat production
• Myoblast differentiation
• Fat production + deposition

Question 6

H-FABP

Answer 6

• Heart fatty acid binding protein
• Intramuscular fat (IMF) content