Disease resistance is a major component of the economic efficiency of mutton sheep production. For comparing the production performance with Mongolia sheep and using heterosis, some foreign mutton sheep, including German mutton merino (1995), Polled Dorset (1996), Suffolk (1997), etc., were imported into Inner Mongolia grassland, China, in the nineties. In this new environment, some diseases influenced the performance were become more important and others less important depending on the climate, the condition of pasture land, the standard of husbandry and the ability of humans to avoid, control and treat the problems created. Where conventional control measures, such as vaccination and chemotherapy, were either ineffective, unsustainable or uneconomic, genetic approaches were considered (Raadsma et al., 1997 ; Baker, 1999). The fundamental definition of ‘disease resistance’ in this paper were reduced parasite burdens or lower incidence of diseases (in the same environment).  This study was devoted to describing breed differences or genetic variation in resistance to sheep diseases between Mongolia sheep and German mutton merino sheep on the Mongolian Plateau.  

L. Zhang

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 13, , 13.29, 2002
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