Difference between revisions of "Oesophageal Groove"
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| Line 30: | Line 30: | ||
*Water consumption does not usually iniatiate groove closure | *Water consumption does not usually iniatiate groove closure | ||
| − | + | *Age when the rumen becomes fully functional and the oseophageal groove closes differs between ruminants | |
| − | *In calves 20 weeks | + | **In calves 20 weeks |
| − | *In lambs 8 weeks | + | **In lambs 8 weeks |
| − | *In deer 16 weeks | + | **In deer 16 weeks |
| − | *In goats 12 weeks | + | **In goats 12 weeks |
Revision as of 15:53, 7 July 2008
Introduction
The oesophageal groove is present in newborn ruminants. It is a channel taking milk from the oesophagues into the rumen, omasum and then abomasum, bypassing the reticulum.
Histology
- Floor of groove smooth and pale
- Stratified squamous epithelium
Formation of the Groove
- Posture- lifting head to suckle
- Calcium ions from the milk
- Teat or teat-shaped experience
- The formation of the groove can be overridden, e.g. bucket feeding calves
Groove Closure
- Unconditioned reflex when the animal is eager for milk
- Water consumption does not usually iniatiate groove closure
- Age when the rumen becomes fully functional and the oseophageal groove closes differs between ruminants
- In calves 20 weeks
- In lambs 8 weeks
- In deer 16 weeks
- In goats 12 weeks
Function in the Adult Ruminant
- The groove is stimulated in adult ruminants by ADH
- The groove can also be closed in adult ruminants by the administration of drugs, e.g copper sulphate, which is of use to prevent drugs becoming diluted in the forechambers. Instead, it directs the drugs directly to the reticulum.