WHITE MUSCLE DISEASE
Cause
a. Not every stiff or weak lamb is affected with WMD...differentiate from other conditions:
· Vibriosis
· Polyarthritis
· Enterotoxemia
· Rickets
b. Mortality rate is high in lambs born with WMD.
c. The delayed (or acquired type) may be corrected more easily. This type has nutritional basis
(Selenium-vitamin E deficiency) and is often triggered by vigorous exercise. Lambs affected by WMD
· move slowly...are in pain
· their backs are arched
· may be down, as paralyzed
· may not nurse and starve out
e. When the heart muscle is severely damaged, death may be sudden.
Treatment
a. Affected lambs should be given injections of sodium selenite -vitamin E. In aqueous solution such as Bo-Se, dosage: newborn lambs, lcc Bo-Se; lambs 2 weeks and older, 4cc of Bo-Se. Inject intramuscularly or subcutaneously.
b. Injection should be repeated every 12-14 days, but not to exceed 4 doses.
c. Maternal diet should be reevaluated. Recently cut, "good" hay (especially legumes) should provide a vitamin E source. If none is available, use Bo-Se or Mu-Se injections to provide ewes with Selenium and vitamin E.
d. The maternal ration may be supplemented with sodium selenite not to exceed 0.3 pp or available selenium.
e. Do not overdose with selenium, toxicity may occur.
Prevention
a. Dietary inclusion of recommended NRC levels selenium and vitamin E.
b. Areas or flocks with past experience of WMD may consider injecting pregnant ewes with selenium-vitamin E preparations at least 4-8 weeks prior to lambing. Use Bo-Se at the rate of a 1 1/2 cc/100 lb.
c. The incidence of WMD may be reduced by incorporating wheat and linseed oil meal in rations of pregnant ewes.
d. May feed pellets containing 5 mg selenium and 350 IU vitamin E before lambing. These pellets are manufactured commercially; follow label instructions.
Some information taken from North Dakota
Extension Guidesheet: "Common Diseases of Sheep"
http://www.case-agworld.com/cAw.LU.nutr.html
This seems to recommend giving it to pregnant ewes "when there has been a problem " with WMD. I wonder if some Vets dont suggest it just because its what theyve heard? Im not sure why they would suggest it when the label says not to.