ANSC 460.3 Lecture Notes - Lecture 7: Acetoacetic Acid, Lipoprotein, Citric Acid Cycle
27 Jun 2018
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Displaced Abomasum
-Incidence in dairy hers 1-25%
-80-90% occur in early lactation
-true stomach normally lies on floor of abdomen
what is a displaced abomasum
-abomasum filled with gas and moves to left or right
-trapped between the rumen and abdominal wall
Why does displaced abomasum occur
-cause not understood
-2 main risk factors: calving and abomasal atony
-calving:
omajority of cases occur soon after calving
opregnant uterus displaces abomasum
oabomasum moves back to normal position post partum
oincrease risk of displacement
-abomasal atony
oreduced contractions and turning over of contents
accumulation of gas and fluid
oabomasum moves up abdomen
-reasons unclear
odepleted blood ca?
reduction in contractions
REDUCTION IN STRENGTH OF CONTRACTIONS
oVFA passage to abomasum
High grain diets and reduced depth of rumen mat
Reduced absorptive capacity
Symptoms of displaced abomasum:
-Inappetance
oDrop in milk yield
-Reduced ruminations
-Distended abomasum and bloat
oMay stand with an arched back or kick at abdomen
-Diarrhea and decreased defecation
-Secondary ketosis
oKetones in blood, milk, breath and urine
oCows responds to glucose treatment but relapse
oRelated to decrease in feed intake so will start mobilizing adipose tissue for lake of
intake
Diagnosis of a displaced abomasum
-Clinical signs
-Abdominal examination with stethoscope
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Document Summary
80-90% occur in early lactation true stomach normally lies on floor of abdomen what is a displaced abomasum abomasum filled with gas and moves to left or right trapped between the rumen and abdominal wall. Why does displaced abomasum occur cause not understood. Reduction in strength of contractions: vfa passage to abomasum. High grain diets and reduced depth of rumen mat. Distended abomasum and bloat: may stand with an arched back or kick at abdomen. Secondary ketosis: ketones in blood, milk, breath and urine, cows responds to glucose treatment but relapse, related to decrease in feed intake so will start mobilizing adipose tissue for lake of intake. Abdominal examination with stethoscope: presence of pining noise, sounds like tap dripping into steel bucket. Blood ketone test to indicate severity of ketosis. Run cow up a steep hill: may correct some milk cases but will most likely cause relapse.
