CHANGES IN RANGE OF PERFORMANCE TEST RESULTS OF GILTS OF POLISH LARGE WHITE BREED PRODUCED IN POLAND IN BYDGOSZCZ BREEDING REGION ZMIANY W ZAKRESIE WYNIKÓW OCENY PRZYŻYCIOWEJ LOSZEK RASY WIELKIEJ BIAŁEJ POLSKIEJ PRODUKOWANYCH W POLSCE W BYDGOSKIM OKRĘGU HODOWLANYM

摘要: The aim of the paper was analysis changes in range performance test results 19782 gilts Polish Large White conducted years 1995-2004, produced Poland area activity Bydgoszcz Breeding Region, covering Kujawy-Pomorze Province. Animals were evaluated regarding to same obligatory methodology 19952004. Within space 10 analyzed 1995-2004 fat content decreased, i.e. backfat thickness P 2 and 4 points decreased by 4.1 3.3 mm, respectively. Body meat tested pigs increased % selection index 14.2 points. Systematic increase value (from 110.7 1995 up 124.9 2004) Region shows effective improvement breed this Poland.