Food Animal Metabolic: Hypomagnesemia Flashcards

1
Q

Hypomagnesemia is also known as?

A

Grass Tetany….Staggers

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2
Q

What is the pathophysiology of Hypomagnesemia?

A
  1. Mg is absorbed into the rumen
  2. Na+ linked active ATPase dependent
  3. Influenced by Na:K ratio, absorption significally impaired <3:1

NO Mg IS STORED IN BODY

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3
Q

T/F: Renal excretion of Mg stops when blood Mg is <0.5mg/dL

A

Super FALSE!!!

<1.8mg/dL

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4
Q

How does a cow develop hypomagnesemia?

A

Eating forage that has low level Mg. Some forage have low Na and Mg and high K and N and it interferese with abdsorption of Mg.

K+ and N+ compete for absorption.

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5
Q

What is the signalment for cows most commonly affected by hypomagnesemia?

A

Nursing cows during early lactation (late winter, early spring)

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6
Q

What is th signalment for high risk groups?

A

Dairy cows 1st 2mo lactation (high Mg demand)

Beef on ferilized LUSH PASTURE

Rapid growing calves on milk diet

Stress induced (transport tetany) cattle/sheep

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7
Q

How gets more hypomagnesemia?

a. Ewes
b. Bitches
c. Cows
d. Equine

A

c. cows

more than ewes and does

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8
Q

How do you dx hypomagnesemia?

A

Usually confirmed by response to tx.

Can do CBC/Chem panel

see decreased Mg in CFS and ocular fluid.

See decreased Ca2+

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9
Q

CS seen with hypomagnesemia?

A

Mostly neurological signs

  • Subacute: stiff, hypersensitive, frequent urination/pooping*
  • Chronic*: Stiff, unthrifty
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10
Q

How do you tx hypomagnesemia?

A

Ca2+ and Mg comobination is the BEST!!!

200-300ml 20% Mg sulfate IV

200ml 50% Mg sulfate SQ

500ml Ca2+ borogluconate 25%

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11
Q
A
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