Author(s): WITOLD MALINOWSKI1, BOGDANWASILEWSKI
Since the early 1970s, a marked increase in the frequency of multiple pregnancies has beenobserved. At first it ran parallel to the increase in the application of assisted reproductive tech-nology and ovulation-stimulating medication. A further increase in the rate of multiple deli-veries, perceptible since the early 1990s, is to a large extent associated with human interfe-rence in the natural environment, including women’s nutritional habits. This refers in parti-cular to the introduction of widespread supplementation with folic acid and to the use of therecombinant bovine growth hormone (recombinant bovine somatotropin, rBST) in cattle bre-eding.