Q.113
Given below are two statements
Statement (I) : The population of megasphaera elsdeni is generally higher in the less efficient animal microbiome.
Statement (II) : Increase in P:A ratio is associated with a decline in CH4 production and increased energy retention by cattle
In light of the above statements, choose the most appropriate answer from the options given below.
- Statement (I) is False: Megasphaera elsdenii is the primary lactate-utilizing ruminal bacterium responsible for converting lactic acid to propionate. It is enriched in highly efficient, grain-adapted ruminants where it prevents subacute ruminal acidosis (SARA), and is lower in less efficient animals.
- Statement (II) is True: Ruminal propionate synthesis serves as an alternative hydrogen sink ($2\text{H}^+ + 2e^-$), competing directly with methanogenic archaea for metabolic hydrogen. An increased Propionate : Acetate (P:A) ratio decreases enteric methane ($CH_4$) emissions and increases metabolizable energy retention.
- Conclusion: Statement (I) is false, but Statement (II) is true.
Correct option: (4) Statement (I) is false but Statement ({I) is true.
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