I have 8 cows with 8 calves, 6 of the pairs I purchased in Oct. of 08. The 2 other pairs were first calf heifers witch I have had for a couple years (well fed and wormed). All calves are within 2 months of each other. My question is ,It is now December and the newer cows don't look as fit, or fat as the two that I have had control over. Could this be because the new cows didn't get a fall wormer. if so, should I wait till I do my usual spring deworming or start now with a deworming block? or I am open for any other ideas.