The Norwegian commercial breeding programme where resistance for mastitis and ketosis are included, has been described. Important genetic gain for resistance to these diseases has been obtained in this programme. The described genetic gain has been obtained in a conventional breeding programme with large emphasis on progeny testing. The genetic gain for milk yield has, because of this, been reduced by some 15%.
No efficient marker traits for disease resistance in dairy cattle has so far been established. It is further concluded that such markers, also in the future, more will be a supplement to conventional breeding programmes than the sole means of selecting for disease resistance.
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., , 445–448, 1990
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