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ICAR AIEEA PG Animal Sciences 14 July 2023 (Shift 1) Paper (Q.57)

MCQ (Single Correct) +4 −1

Ruminant animal fed on hay diet only will have higher molar proportion of

which of the following volatile fatty acids?

केवल सूखी घास (हे) के आहार पर पाले गए जुगाली करने वाले पशु में निम्नलिखित में से किस वाष्पशील फैटी एसिड का मोलर अनुपात अधिक होगा?

Butyric acid ब्यूटायरिक अम्ल Propionic acid प्रोपियोनिक अम्ल Valeric acid वैलेरिक अम्ल Acetic acid एसिटिक अम्ल

Rumen fermentation and Volatile Fatty Acid (VFA) proportions:

When ruminants consume a roughage-rich fibrous diet (e.g. hay or pasture), cellulolytic and fibrolytic bacteria (Ruminococcus albus, Ruminococcus flavefaciens, Fibrobacter succinogenes) predominate in the rumen.
Fibrolytic fermentation shifts the pathway primarily toward acetate production, yielding an acetate:propionate ratio of $3:1\text{ to }4:1$ (acetate comprises $65\%\text{ to }70\%$ of total VFA).
High-concentrate/grain diets, in contrast, favor amylolytic bacteria producing higher proportions of propionate.

Option analysis:
Acetic acid is the predominant volatile fatty acid on roughage/hay diets, making Option 4 the correct answer (Key 4).

रूमेन किण्वन और वाष्पशील फैटी एसिड (VFA) अनुपात:

जब जुगाली करने वाले पशुओं को उच्च रेशा युक्त आहार (जैसे सूखी घास/हे) खिलाया जाता है, तो रूमेन में सेलुलोलिटिक जीवाणु सक्रिय होते हैं।
रेशे के किण्वन से मुख्य रूप से एसिटिक अम्ल (एसीटेट) का उत्पादन होता है, जो कुल VFA का $65\%\text{ से }70\%$ भाग बनाता है (एसिटेट:प्रोपियोनेट अनुपात $3:1$ से अधिक रहता है)।
अनाज या सांद्र दाना खिलाने पर प्रोपियोनिक एसिड का अनुपात बढ़ता है।

विकल्प विश्लेषण:
सूखी घास पर एसिटिक अम्ल का अनुपात सर्वाधिक होता है। अतः सही उत्तर विकल्प 4 है।

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report

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