Izlaganje sa skupa
ECONOMIC VALUES IN DAIRY CATTLE BREEDING, WITH SPECIAL REFERENCE TO FUNCTIONAL TRAITS
Ab. F. Groen
; Department of Animal Breeding, Wageningen Institute of Animal Sciences,Wageningen, Netherlands
Torstein Steine
; Department of Animal Science, Agricultural University Norway, Norway
Jean-Jacques Colleau
; Department of Animal Genetics, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
Jørn Pedersen
; The Danish Agricultural Advisery Center,Denmark
Josef Pribyl
; Research Institute of Animal Production, Praha, Czech Republic
Norbert Reinsch
; Institute for Animal Breeding, Kiel, Germany
Sažetak
A genetically and socio-economically balanced selection on production (milk and beef) and functional traits (health, fertility, efficiency of feed utilisation and milkability) in dairy cattle requires correct economic values. Correct relative levels of economic values of traits give optimum levels of genetic improvement according to future production circumstances; correct absolute levels are important for an accurate calculation of economic revenues of breeding programmes. The derivation of economic values requires a good theoretical basis, proper methodology in terms of models including physiological modelling of animal production, farm economics and social aspects, and appropriate assumptions on future production circumstances. The field of breeding goal definition is of ongoing interest, especially because knowledge on modelling is improving and on uncertain future production circumstances are continuously changing. Moreover, although research has been undertaken for a long period, the practical integration of functional traits in dairy cattle breeding goals is still a major challenge for animal breeders. The aims of this working group report are: a. to present the definition of a set of breeding goal traits, b. to discuss the methodology in deriving economic values, c. to present a summary of literature on economic values of functional traits, d. to discuss a possible justification of differences in breeding goal definition for countries, regions, and/or individual farms, and e. to discuss possible future trends potentially influencing breeding goals by changing economic values.
Ključne riječi
Hrčak ID:
164507
URI
Datum izdavanja:
18.11.1996.
Posjeta: 1.290 *