The analysis of reproductive parameters in sheep of mixed wool in Poland in the years 2005-2015

Sa？etak The aim of this paper was to analyse the reproductive parameters (fertility, prolificacy, number of lambs raised and reproductive performance) in sheep of mixed wool in Poland in the years 2005-2015. In the years subject to analysis a decline was observed, both in the population of sheep and in the population of ewes of all breeds and varieties entered in the herd books in Poland. A growth was noticed, however, in the population of four conservation breeds (heath sheep, ？winiarka sheep, coloured Polish mountain sheep and podhale zackel sheep), which constituted in 2015 25.6% of domestic population of ewes entered in the herd books. The growing number of the studied ewes' populations was nevertheless parallel with negative development tendencies in terms of the evaluated reproductive parameters