Topics:
Animal Physiology, Animal Refresher
Phase of Gastric Secretion Absent in Herbivores
Which of the following phase of gastric secretion is absent in herbivores-
- Cephalic / Reflex phase — Correct Answer
- Intestinal phase
- Gastric phase
- None
Explanation:
Correct Answer: Cephalic / Reflex phase
The Cephalic (Reflex) Phase of gastric secretion is absent in herbivores (ruminants and other continuous grazers).
Why is the Cephalic Phase Absent in Herbivores?
- Cephalic phase is triggered by sight/smell/taste/anticipation of food via the vagus nerve
- Herbivores are continuous grazers — they eat throughout the day in small amounts rather than discrete meals
- There is no distinct 'meal anticipation' signal to trigger brain → vagus → stomach preparatory secretion
- Ruminants also have continuous salivation (150 litres/day in cattle) and continuous rumen fermentation, so there is no need for preparatory gastric activation
Species Comparison
- Carnivores (dog, cat): All 3 phases present — hunt and eat discrete prey/meals
- Omnivores (pig, human): All 3 phases present — eat at defined mealtimes
- Herbivores (cattle, sheep, goat): Cephalic phase absent; Gastric and Intestinal phases present
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
