What defines Type 2 vagal indigestion?

• A. Omasal transport failure = impairment of flow of ingesta through reticulo-omasal orifice
• B. Failure of rumination due to reticular obstruction
• C. Obstruction at the esophageal groove
• D. Ruminal acidosis with lactic acid buildup

Answer: (A)

The key idea is impairment of moving ingesta from the reticulum into the omasum. In Type II vagal indigestion, the omasal transport is defective—the reticulo-omasal orifice doesn’t pass ingesta as it should, so material accumulates in the forestomachs and flow forward is hindered. This dysfunction is tied to vagal control of coordinated contractions that normally drive ingesta through the reticulo-omasal opening; when that flow is blocked or slowed, you get the characteristic transport failure of this form.

The other scenarios describe different problems: failing to chew or ruminate due to mechanical reticular issues isn’t the same as blocked transport across the reticulo-omasal orifice; obstruction at the esophageal groove is a separate neonatal issue; and ruminal acidosis with lactic acid buildup is a metabolic disorder, not a failure of omasal transport.