Q.119
‘As compared to normal growth condition, the double muscling in animals results in
(A) . Higher proportion of white fibers to red fibers
(B) . Rapid growth with very high marbling
(C) . Greater muscle to bone ratio
(D) . Higher dressing percentage
Choose the correct answer from the options given below:
- Phenotype of Double Muscling in Livestock (e.g., Belgian Blue cattle):
- Caused by an inactivating mutation (11-bp deletion) in the myostatin gene (MSTN), which normally inhibits skeletal muscle growth.
- Key Manifestations:
- Higher White-to-Red Fiber Ratio: Extreme hyperplasia of fast-twitch glycolytic (Type IIB white) fibers.
- Greater Muscle-to-Bone Ratio: Muscle mass increases by $20\text{--}30\%$ with finer, lighter skeleton.
- Higher Dressing Percentage: Carcass dressing yield reaches $65\text{--}70\%$ (compared to $55\text{--}58\%$ in normal cattle).
- Marbling (B): Double-muscled animals have extremely low intramuscular fat and virtually absent marbling.
- Conclusion: Statements (A), (C), and (D) are correct.
Correct option: (4) (A), (C) and (D) only.
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