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The paper analyzes the 2760 gilts four different genotypes, two of which are  pure bred Landrace (429 gilts) and Yorkshire (421 gilts) and two hybrid  F1(YxL) (999 gilts) and F1(LxY) (911 gilts), tested in the period from 2010  to 2011.Analyzed by the following traits of intensity growth: weight at  weaning (WW), daily gain at suckling (DGS), weight in rearing (WR), daily  gain at rearing (DGR), weight in test (WT), daily gain on test (DGT), weight  of gilts (WG) and life gain (LG). Due to the manifestation of heterosis  effect, hybrid gilts in rearing made any higher body weight of about 3 kg,  while the age of 160 days on average had a higher body weight by 7.0 kg  compared to the pure breed gilts, which resulted in higher daily gain in  different phases of rearing. Degree of heritability for analysis traits of  intensity growth is of medium to high. Heritability (h2) for daily gains were  larger (0.640 for DGS, 0.858 for DGR and 0.859 for DGT) in relation to the  heritability for achieved body weight (0.584 for WW, 0.558 for WR and 0.816  for WT) in different phases of rearing. Between the most observed traits were  found positive genetic and phenotypic correlations. The negative correlation  found between WR, DGR and WT, DGT (rg= -0.055 to -0.108; rp = -0.010 to -  0.033), between WW, DGS and DGR (rg= -0.301 respectively -0.466; rp = -0.234  respectively -0.271). [Projekat Ministarstva nauke Republike Srbije, br. TR  31032]

Quantitative-genetic analysis of intensity growth of gilts fertile breed and their hybrids in the nucleus farm