STUDIES ON ENERGY AND NITROGEN-METABOLISM OF PREGNANT AND LACTATING SOWS AS WELL AS SUCKLING PIGLETS .6. COMPARATIVE-STUDIES OF ENERGY AND NITROGEN-METABOLISM OF NONPREGNANT AND PREGNANT SOWS

Aim of the studies was to attain new scientific findings for the influ ence of the physiological state of sows (non-pregnant and pregnant res pectively) on energy and nitrogen metabolism. The experiments were car ried out according to a 3 x 3 factorial experimental plan with 3 Varia nts of litter number (1, 2 and 4) and 3 variants of energy supply (120 , 100 and 80%). Within the variants the non-pregnant and pregnant sows were fed equally related to the metabolic live weight. The metabolism measurements run from the 1st to the 115th experimental and gestation day respectively. The methods of indirect calorimetry and slaughterin g technique were applied. The chemical composition of the whole bodies of the non-pregnant sows was like that of the maternal bodies of the pregnant sows (dry matter 410 g/kg, protein 160 g/kg and fat 210 g/kg) . The physiological stare for the sows did not influence the nutrients digestibility (OM 77.0 and 76.7%) and the energy metabolizability. Ab out conformable intakes of metabolizable energy (601 and 586 kJ/kg LW( 0.75). d) and of digestible nitrogen (0.77 and 0.75 g/kg LW(0.75). d) in non-pregnant and pregnant sows resulted in higher deposition of ene rgy (64 and 79 kJ/kg LW(0.75). d) and of nitrogen (0.15 and 0.19 g/kg LW(0.75). d) in the pregnant sows due to energy and nitrogen depositio n in the conception products and in the reproductive organs. The energ y maintenance requirement and the partial efficiency of the energy uti lization for the deposition as well as the nitrogen maintenance requir ement and the partial efficiency of the nitrogen utilization for the d eposition in the non-pregnant and the pregnant sows were determined.