Effect of chronic immobilization stress on tissue distribution of vitamin A in rats fed a diet with adequate vitamin A.

A double rocking sprinkler has a first casting, a second casing coupled with the first casing, a first cover and a second cover covering the first and the second casings, and a first sprinkle plate and a second sprinkle plate disposed in the sprinkler in series. A drive device is disposed in the sprinkler for rotating the first and second sprinkle plates relative to each other.