conditioned animals. High grain result in increased VFA flow through
the abomasum, which decreases abomasal contractility, contributing
to the incidence of this condition. Abomasal displacement can also
occur following sudden ration changes. Many think that anything that
allows space in body cavity for the abomasum to migrate, increases
the chances of clinical displacement.
During late pregnancy, the
omental attachments to the abomasum become stretched. The degree of
stretching may be related the risk of later displacement. The
genetics of the animal also affects predisposition to this disorder;
the heritability has been estimated at 24% in cattle.
Sudden decrease in feed intake (due to the inability of feed to
leave the rumen)
Drastic decrease in production
Animal appears to be in pain and may stand with back arched
Displacement cases are diagnosed most in about two weeks prior
to postpartum, however about 25% cases appear after this time.
Heifers rarely become victim of this problem. Incidence
increases through the sixth lactation and declines thereafter.
Nonsurgical treatment of the problem mainly depends on the removal
of the gas from the abomasum. Rolling the animal on her back from
right to left several times may allow the left side displaced
surgical treatment consists of
getting the abomasum into place and attaching it surgically to the
body wall. This technique provides a permanent solution.
Successful rolling followed by the tethering of the right hind leg
to force animal to lie on its left side allows a recovery rate of
87% compared to 92% for surgical intervention.
Control and Prevention:
Prevention of displaced abomasum is achieved very effectively by
preventing other metabolic disorders.
Dairy animals should be in proper body condition at calving (BCS
of 3.25 to 3.75) and fed to encourage at maximum intake of a
well-balanced ration during the transition period.
Gradually shifting of dry animals to a higher energy ration
Limiting feeding of concentrates prior to calving; this is one
view. Another view is concentrates should be fed from 3 weeks
prepartum, starting at a low level up to a maximum of 3 Kg just
Stabilize the rumen with adequate long fibre (2 Kg over 40 mm).
Avoiding overconditioning of animals
Providing sufficient exercise opportunities for dairy animals