When developing inbred lin e s through b ro th e r-siste r m atings, along with se le ctio n fo r p a n -size bodyweight, no diffe re nce in growth performance to the outbred con trol was observed in second generation inbred lin e s (F = 0.375). The inbreeding depression in v ia b ilit y a lso turns out much lower, than in the f ir s t inbreeding generation (F = 0.25). Gynogenesis, as an a lte rn a tive inbreeding method, could fasten inbreeding process. There is the p o s s ib ilit y of producing homozygous d ip lo id gynogenetic rainbow trout. Apparently the techniques necessary to in h ib it the f ir s t m ito tic d iv isio n need further improvement in order to be of p ra c tic a l use, as the 3 one- year-old homozygous d ip lo id gynogenetic fish produced in d icate . The sig n ific a n c e of inbred lin e s fo r the production performance of rainbow trout can only be estim ated a fte r further inbreeding through test c ro ssin g of lin e s.

G. Horstgen-Schwark

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 163–166, 1990
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