PL
Wskaźniki fizjologiczne jako cechy selekcyjne znajdują coraz szersze zastosowanie w pracach hodowlanych [8] jednak powiązanie cech fizjologicznych samców z cechami reprodukcyjnymi samic, z uwagi na odmienne gonady i ich funkcjonowanie, napotyka na trudności interpretacyjne [7]. Mimo zgodności co do potencjalnych możliwości prognozowania wartości cech samiczych z cech samców [1], nie opracowano jak dotąd ogólnych założeń metodycznych do praktycznego stosowania. Próbą ukazania takich zależności jest niniejsza praca.
EN
Reproductive traits of 10 groups of half-sibs ram-lambs and ewes of Polish Merino from flock with mating season starting the 1-st of June, were analysed. Indices of scrotal circumference to body weight (OJM/MC100 and OJMMC150) and regression coefficients of scrotal circumference on body weight (MOO MC/OJM and bl50 MC/OJM) obtained from ram-lambs measurements at 100 and 150 days of age were used to compare with female traits of half-sib ewes. Body weight of ewe-lambs at 12 months (MCM), first season lambing date (TW1) and fertility (PLOD1), average (max. 5 seasons) lambing date (STW) and prolificacy (SPL) as well as number of lambs born per 1 year of performance (SLJ) were used to characterise females. High values of OJM/MC characterizing ram-lambs groups were connected with lower MCM, earlier TW1 and higher PLOD1 in half-sib ewes. High values of the indicators of dynamic changes in gonads size had opposite relations with female traits - blOO MC/OJM was negatively while M500 MC/OJM was positively correlated with SPL and SLJ. A preliminary assessment of the association between male traits and the reproductive performance of female relatives is provided.