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The ruminant stomach occupies most of the left hand side of the abdomen. It is a vast structure, holding up to 60 litres in an adult cow. The rumen holds 80%, reticulum 5%, omasum 8% and abomasum 7% in larger ruminants. In smaller ruminants the proportions are slightly different, with the rumen holding 75%, reticulum 8%, omasum 4% and abomasum 13%.
 
The ruminant stomach occupies most of the left hand side of the abdomen. It is a vast structure, holding up to 60 litres in an adult cow. The rumen holds 80%, reticulum 5%, omasum 8% and abomasum 7% in larger ruminants. In smaller ruminants the proportions are slightly different, with the rumen holding 75%, reticulum 8%, omasum 4% and abomasum 13%.
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The different compartments of the ruminant stomach develop from the foregut spindle in foetal life. During embryogenesis and after birth the [[Abomasum - Anatomy & Physiology|abomasum]] is the largest of the compartments (over half of the weight and capacity of the four stomachs) due to the [[Oesophageal Groove|oesophageal groove]] directing milk from the oesophagus to the abomasum, bypassing the rumen reticulum omasum
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The different compartments of the ruminant stomach develop from the foregut spindle in foetal life. During embryogenesis and after birth the [[Abomasum - Anatomy & Physiology|abomasum]] is the largest of the compartments (over half of the weight and capacity of the four stomachs) due to the [[Oesophageal Groove|oesophageal groove]] directing milk from the oesophagus to the abomasum, bypassing the rumen, reticulum and omasum.
    
==Physiology==
 
==Physiology==
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