EXCHANGE OF PHOSPHORUS COMPOUNDS IN PREGNANT AND LACTATING ANIMALS

Abstract

The results of the study of phosphorus metabolism at a high level of lactation are given. In the first phase of lactation, a high content of NF was found in the blood of cows, in subsequent phases due to depletion of phosphorus reserves in the body, the level of NF decreased, and with the end of lactation, the amount of NF increased again. It is noted that the concentration of pyruvic acid increases in the blood of pregnant animals. In the blood serum of rabbits in the second decade of pregnancy, the content of phosphopyruvic acid (FPA) increases, and by the end of pregnancy it decreases, with the beginning of lactation (post- sucking period), the level of FPK increases again, but in the second half of the post-sucking period (15-20 days after birth), it decreases , reaching the lowest values by the end of lactation 25-30 days after the cycle. The content of KrF increases significantly by the middle of pregnancy, decreases by the time of parturition, and increases slightly again by the end of the suckling period. In the conducted experiments, lactating females were slaughtered 22-26 days after parturition. At the same time, the tissues of control (non-lactating) rabbits were studied. The clearest changes were found only in the NF content. In the liver of animals, the content of FPK, total and inorganic phosphate decreased, in the muscles the level of NF only decreased, and in the blood not only NF, but also CrF. In the bones of lactating rabbits, the level of total phosphorus and calcium was also slightly reduced. The results of the experiments are convincing that during intensive lactation, animals have a significant phosphorus deficiency, which is reflected in the content of total and inorganic phosphorus not only in blood, but also in other tissues, in particular - liver, muscles and bones. In the blood of

pregnant and lactating animals, a certain dependence is observed between the activity of alkaline phosphatase and the exchange of phosphorus compounds.