Untersuchungen zum Trächtigkeitsanabolismus der Spurenelemente Kupfer, Zink, Nickel und Mangan bei Zuchtsauen

Abstract

German Landrace sows (16) were used to study the influence of gravidity and a varying dietary trace element supply on the total balance of Cu, Zn, Ni and Mn from the 21st day of gravidity until farrowing. The trial was of a factorial design (2 .times. 2 .times. 3). The balances were measured with 8 nongravid and 8 gravid sows at 2 levels of trace element supply (basic and supplemented groups) in 3 collecting periods. The concentration of Cu, Zn, Ni and Mn was analyzed in the gestational products, i.e., in piglets amniotic fluid and placenta. These balance trials were conducted to investigate whether there also is a pregnancy anabolism of Cu, Zn, Ni and Mn in sows. Trace element excretion in the gestational products as a percentage of total fecal and urinary excretion was 2.3, 2.5, 0.4 and 0.2% for Cu, Zn, Ni and Mn, respectively. The balances of Zn, Ni and Mn were controlled homeostatically in the nongravid sows with a higher intake of these elements. A daily requirement of 12 mg Cu, 50 mg Zn, 1.4 mg Ni and 50 mg Mn is established, i.e., 6 mg Cu, 25 mg Zn, 0.7 mg Ni and 25 mg Mn/kg of feed. At increased dietary supply of Cu, Zn, Ni and Mn, pregnancy anabolism of these elements took effect in sows.