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during a heavy lactation, cows lose as much as 25 per ant of the calcium and phosphorus of their skeleton. They even become subject to hip and leg fractures because of these mineral losses.
During the drying-off and the, dry period the cows, for the first time since calving, are in a position to restore their necessary reserve nutrients. Not merely the visible reserves that show up as good con-' dition of flesh, but also the invisible reserves?the minerals and vita-; mins .that are stored in the skete- j tons, the liver, and other organs of! the body. In addition to restoring her reserves during the d^y period, the cow is meeting larger and larr ^er nutrient demands of the growing fetus.■■’ ; , - ;;
!» is vital to make sure she receives the right kind and amount of minerals. Dr. E. B. Meigs of the United States Department of Agriculture has demonstrated that an adequate supply of phosphorus during the dry period is rewarded •vith a better flow of milk durinf the following lactation. The op posite is true too—phosphorus de ficiency during the dry period re *r>i!t«d in lowered,milk production j ^t the Ohio Experiment Station, Dr, E. 8. Forbes shown 1 that cows accumulate the vital , calcium and phosphorus in their bodies most effectively only during the dry period and in the latter of lactation. |
53.5%