[Ca and P metabolism in the skeletal system of the dairy cow as shown in histometric follow-up studies on the substantia spongiosa of the tuber coxae].
Histometric follow-up checks of the Substantia spongiosa of Tuber coxae in dairy cows have shown the trabecular percentage of the skeleton to decline continuously from the onset of lactation and to reach its lowest point in the last third of the lactation period. This was followed by some rise up to the next lactation, but the original values were not restored. 2. The percentage of spongiosa trabeculae, consequently, drops along with growing age, and so does the absolute trabecular surface. 3. No unambiguous dependence of trabecular surface on milk yield was established. 4. The results obtained from the above checks are discussed with reference to the physiological dynamics of the bone system as a mobile store of minerals. Some of the aspects mentioned are of greater relevance to practice.
