A qualitative assessment of 169 chief breeding studs was conducted in the years 1986-1999 in the horse breeding farms in north-eastern Poland (Liski, Rzeczna, Plękity, Kadyny, Nowa Wioska). The usability of the studs for breeding was evaluated based on a proposed index of stud breeding effectiveness. It formed the basis for a classification of studs in terms of their usability for breeding. Selected breeding studs were also characterised in terms of their ability to pass on the desired functional features onto their offspring.

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