The current population of wisents (Bison bonasus, Linnaeus 1758) originates from only 12 individuals that survived World War II in zoos and private enclosures. For better preservation genetic variability, research is being conducted to introduce assisted reproductive techniques this species. In article, we describe the state knowledge prospects for further development field. article divided int...

Assisted reproductive technologies (ARTs) have become almost commonplace in the developed world. It is estimated that 1% of American children are now conceived using some form of assisted reproduction, and that over a million children have been born as a result of the use of ARTs. In the past several years, however, scientists have begun to sound a cautionary note about the health outcomes of A...

Assisted reproductive techniques might prove themselves useful tools in producing buffaloes free of specific diseases (BFSD), which are in demand in South Africa. Freezing protocols for African buffalo semen must not only result in good post-thaw qualities, but must also be practical. Epididymal sperm from six mature African buffalo bulls was collected, diluted with three different semen extend...

To investigate the time course of speciation, we gathered literature data on 119 pairs of closely related Drosophila species with known genetic distances, mating discrimination, strength of hybrid sterility and inviability, and geographic ranges. Because genetic distance is correlated with divergence time, these data provide a cross-section of taxa at different stages of speciation. Mating disc...

BACKGROUND Medicinal leeches (Hirudo spp.) are simultaneous hermaphrodites. Mating occurs after a stereotyped twisting and oral exploration that result in the alignment of the male and/or female gonopores of one leech with the complementary gonopores of a partner. The neural basis of this behavior is presently unknown and currently impossible to study directly because electrophysiological recor...