Snag
Schiegen are hybrid creatures ( hybrids / chimeras ) made up of sheep and goats . There are two fundamentally different hybrid beings, which are referred to as Schiegen, Hybrid Schiegen and Chimeric Schiegen.
Hybrid beating
During natural mating, a goat's egg cell can be fertilized with a billy goat sperm (or vice versa: sheep's egg cell with billy goat sperm). The fertilized egg begins to develop, but in the vast majority of cases an early spontaneous abortion occurs . In some rare cases, however, a hybrid Schiege can be born. According to the literature, the boy develops particularly quickly, which can be explained by the heterosis effect . Proof that it is a hybrid is, for example, the preparation of a karyogram . The karyogram shows 2n = 57 chromosomes, a value that lies between the number of chromosomes in sheep (2n = 54) and goat (2n = 60). Despite several attempts at mating, Schiegen has not been able to produce any offspring to this day. So one suspects sterility of the hybrid Schiege, similar to the situation with the mule . The viability is surprising because the goat and sheep are not only different species , but also different genera .
Chimeric silence
In the 1980s, a group of researchers was able to create a chimera between goat and sheep. It was created by fusing a sheep embryo with a goat embryo. In addition to body parts whose cells have the genetic makeup of a sheep, there are also body parts whose cells have goat genetic makeup.
literature
- K.-G. Witstruk, K. Zernahle: Evidence of a goat-sheep bastard. In: Biologische Rundschau. 20, 1982, pp. 32-34
Web links
Individual evidence
- ↑ Carole B. Fehilly, SM Willadsen, Elizabeth M. Tucker: Interspecific chimaerism between sheep and goat . In: Nature . 307, No. 5952, February 16, 1984, pp. 634-636. bibcode : 1984Natur.307..634F . doi : 10.1038 / 307634a0 . PMID 6694751 .