Ruminant Lecture

Ruminant Lecture - AnS 214L Lab 6 The Ruminant Digestive...

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AnS 214L Lab 6 The Ruminant Digestive System
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Digestion in Herbivores • Problem – 50% of organic carbon on earth is cellulose – Animal cells do not make enzymes capable of breaking the bonds between glucose units in cellulose • Solution Microbial Fermentation • Cellulose digested by microorganisms (bacteria, protozoa, fungi) in the gut • Animals utilize the products of fermentation • Normally an anaerobic process (no O 2 )
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Two Types of Microbial Fermentation • Post-gastric fermentation (caudal fermentation) – Fermentation in the cecum and/or large intestine – Examples: rabbit, horse • Pre-gastric fermentation (cranial fermentation) – Fermentation occurs in a multicomponent stomach – Two classes • True ruminants - cattle, sheep, goats – 4-compartment stomach – Rumination cycle • Pseudo-ruminants - camels, llamas, alpacas, vicunas
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Ruminants utilize a 4-chambered stomach
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Rumen Microbes • Bacteria – >200 species – 99.5 % obligate anaerobes – Cellulolytic
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Ruminant Lecture - AnS 214L Lab 6 The Ruminant Digestive...

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