Changes

==Aetiology==

==Aetiology==

Impaction of the stomach typically consists of excessive dry, fibrous ingesta, but may also be composed of ingested materials that form a mass, suchas persimmon seeds or mesquite beans.1-3 Other feeds that tend to swell after ingestion, including wheat, barley, and sugar beet pulp, may also cause impaction. Furthermore, dental disease may increase the likelihood of gastric impaction because of improper chewing of feed. (Bliks)

The specific cause of the impaction is not always apparent(Sanchez) but the obstruction typically consists of excessive dry, coarse ingesta such as straw bedding or poor quality forage.(Sanchez)  It may also be composed of foreign bodies, ingested materials that form a mass (such as persimmon seeds or mesquite beans.1-3 in Bliks) or feeds that tend to swell after ingestion.(151-4 in Sanchez) Gastric impaction may be the result of an gastric atony or defective secretion.(Edwards)

Thecause of the impaction is often not known. However it may be the result of an intrinsic disturbance ofstomach function such as atony or defective secretion(Edwards)

 

Although speciifc cause not always evdient, ingestion of coarse (straw bedding, pooor quality forage), foregin objects, and feed that may swell after ingestion or improper mastication (persimmon seeds, mesquite beas, wheat, abrley, sugar beet pulp) implcated (151-4 in Sanchez)

===Predisposing factors===

===Predisposing factors===

*Ingestion of certain feedstuffs including beet pulp, bran, straw, wheat and barley - beet pulp and bran can become dessicated within the stomach and may not become rehydrated by water or gastric secretions

*Ingestion of certain feedstuffs including sugar beet pulp, bran, straw, wheat and barley.  Beet pulp and bran can become dessicated within the stomach and may not become rehydrated by water or gastric secretions.(Mair)

*Dental disorders - roughage may be incompletely masticated

*Dental disorders - roughage may be only partially masticated.(Mair)

*Feeding a horse that has signs of colic - there may be poor gastric emptying associated with generalised decreased gastrointestinal motility

*Feeding a horse that has signs of colic - there may be poor gastric emptying associated with generalised decreased gastrointestinal motility

*Rapid consumption of feedstuffs (Sanchezz)

*Rapid consumption of feedstuffs.(Sanchezz)

*Inadeqaute water cosumption (Sanchez)

*Inadequate water consumption.(Sanchez)

secondary gastric impaction associated with ragwort poisoning(Milne)

*Secondary gastric impaction has been related to ragwort poisoning(Milne)

==Clinical signs==

==Clinical signs==