Left and right side displacement of abomasum, Biology

Left side displacement of abomasum (LDA)

Etiology: It occurs commonly in large-sized, high producing adult dairy cows, immediately after parturition. High yielders are at a greater risk. The exact etiology is unknown. Occasional cases may also occur before parturition. Feeding of a low roughage and high concentrate diet is associated with LDA. Older cows suffer more than the younger ones. Following heavy grain feeding, flow of rumen ingesta to abomasum is increased. This causes distension of the abomasum with gases, predisposing its displacement. Increase in volatile fatty acids (VFA) contents of rumen reduces the motility of the smooth muscles and may cause abomasal distension. Concurrent diseases like hypocalcemia, metritis, mastitis, indigestion and traumatic reticuloperitonitis were also associated with LDA.

Right side displacement of abomasum (RDA)

Etiology: It is a subacute disease of mostly high yielding dairy cows few weeks after parturition. It occurs either due to obstruction of pylorus or primary atony of abomasal musculature. Atony of abomasum may occur to grain feeding, relative inactivity during winter housing and stress of parturition.

Pathogenesis: In LDA, abomasal atony is the primary dysfunction. The atonic organ is displaced upward along the left abdominal wall, lateral to the spleen and dorsal sac of the rumen. Hypomotality of abomasum is associated with high concentrate and low roughage diet. Due to abomasal atony there is a mild metabolic alkalosis, hypokalemia and hypochloremia.

In RDA, there is abomasal atony resulting in the accumulation of gases and fluid leading to gradual distension and displacement in caudal direction on the right side. During this period there is continuous secretion of hydrochloric acid, sodium chloride and potassium in the abomasum. This also leads to the metabolic alkalosis, hypokalemia and hypochloremia and the animal is dehydrated.

Clinical signs: The clinical signs of left displacement of abomasums and right displacement of abomasum are discussed here.

Left displacement of abomasum: Animal shows inappetance within few days following parturition. There is marked fall in milk production. Temperature, heart and respiratory rates are within the normal range. Faeces are pasty and scanty. Auscultation of left paralumber fossa reveals splashing sounds. Rumen contrac­tions are decreased in frequency and amplitude. On rectal examination, emptiness in the right upper abdomen is observed and rumen size is small. Mild abdominal pain is evident by shifting weight from one leg to another (treading).

Right displacement of abomasum: History of calving within last few weeks can be known from the owner. Affected animal has low milk production and inappetance to anorexia. There is no interest in feed and the animal is dehydrated. Tempe­rature, heart and respiration rates are normal. Mucus membranes are pale or muddy. Rumen is atonic. Distended abomasum may be palpated behind and below the right costal arch. Splashing sounds are heard on auscultation on right abdomen. Faeces are scanty, soft and dark in colour. Sudden death may follow after rupture of abomasum.

Laboratory diagnosis: Mild haemoconcentration is revealed by increase in PCV, Hb (hemoglobin) and plasma protein. There is increased level of BUN (blood urea nitrogen) and metabolic alkalosis. Paracentesis of the distended abdomen (10-11 intercostal space) may reveal pH of 2 to 3 with no protozoa. Mild hypocalcaemia is also present.

Treatment: Non-surgical correction attempt may be taken. Animal has to be casted on left side by tying the feet together and rolling the animal from side to side in 70° arc while the animal is in dorsal recumbency. Rolling and manipulation may be successful. Intravenous glucose therapy may be required once as ketotic signs appear. Animal should not be fed with grains for 3-5 days. Fluids and electrolytes may be given. To evacuate contents of   abomasum mineral oil or magnesium hydroxide may be given.

Posted Date: 9/19/2012 1:02:31 AM | Location : United States







Related Discussions:- Left and right side displacement of abomasum, Assignment Help, Ask Question on Left and right side displacement of abomasum, Get Answer, Expert's Help, Left and right side displacement of abomasum Discussions

Write discussion on Left and right side displacement of abomasum
Your posts are moderated
Related Questions
Can someone describe the fundamental aspects of protein structure? I'm already familiar with the amino acid structure, I just don't have a clear conceptual understanding of protein

Many definitions of species have been offered, but none of them proved to be satisfactory. The definitions did not categorically provide the basis to decide whether two similar gro

The Jones family was caught in a fire but escaped. Unfortunately the father and daughter suffered burns. The father had second degree burns on his chest, abdomen, and both arms, an

Explain the Transfer from liquid medium to solid media? Here the steps involved include: 1. Inoculating loop is sterilized by incineration and allowed to cool, as described

Lipid profile control Evaluation of lipid profile is essential to the management of diabetes and should be performed at initial visit in all patients with diabetes.  You have l

Define Meat as a Rich Source of Protein? Skeletal or striated muscles are used for food purposes. Flesh of cattle, sheep and swine comprise most of the meat contents. Edible me

Q. What is Salty taste? Various ions both cations and anions are responsible for the salty taste. These include: K (Potassium), Na (Sodium), Li (Lithium), Cl, Br (Bromine), I (

Chromosome jumping is the technique whereby one begins with a piece of DNA from one area of a chromosome, and obtains clones from nearby areas without cloning everything in betwee

Are the phloem and the xylem made of living cells? The cells of phloem are living cells and the cells that constitute the xylem ducts are dead cells killed by the lignin deposi

Concomitant or Non-Paralytic Squnit This type of squint usually occurs when there is an obstacle in the sensory pathway of binocular reflex such as refractive errors, opacities