Primary tympany is generally due - Solved MCQ | Agrigyan

• Pathogenesis of Primary Tympany (Frothy Bloat): Primary ruminal tympany is a nutritional disorder caused by the excessive ingestion of lush, immature, rapidly growing legumes (such as alfalfa, red clover, and ladino clover) or young winter wheat pastures.
• Biochemical Froth Formation: These forages contain high concentrations of soluble chloroplast proteins (particularly 18S fraction I protein) and saponins. Rapid microbial fermentation releases these foaming agents, creating a persistent, stable, viscous foam that traps fermentation gases ($\text{CO}_2$ and $\text{CH}_4$). The foam covers the cardia, inhibiting the eructation reflex and leading to life-threatening ruminal distension.
• Secondary Tympany (Free-Gas Bloat): Caused by mechanical or functional esophageal obstruction (choke, tumors, papillomas, vagal indigestion).

Correct option: (3) Excessive feeding of legumes