In a long term rotational crossbreeding between German Landrace (GL) and German Pietrain (GP) pigs crossbreeding effects were estimated for carcass performances and productivity of fattening pigs as well as fertility of the sows. The meat quantity and quality were mainly determined by additive genetic effects while the
 fertility and productivity traits by heterosis effects. The Rotation-GP (ROTGP) was significantly superior with respect to meat quantity and feed conversion, while the Rotation-GL (ROTGL) had Higher fertility. In order to
 make an effective use of both combination and heterosis effects as well as the differential merits of the two rotation groups, a modified rotation scheme has been suggested. According to this, ROTGL sows should be mated
 to GP boars to produce the fattening pigs while the ROTGP sows should be used only for replacement of the
 ROTGL stock. A comparison of the organisation and production from conventional and the modified schemes has shown significant merits of the modified scheme in improving the overall profitability of pig production

Y. Fu, P. Horst, A. Valle-Zarate, P. K Mathur

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 417–420, 1994
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