Abstract
Production in the farm directly depends on the quality of gilts. For this reason it would be necessary to replace non-productive sows. By monitoring and control of the growth intensity in the performance test make possibility to provide selection effect and get gilts adequate age and weight at insemination. The present paper analyses of growth traits from birth until the end of the performance test. The investigations included 205 gilts, of which 104 Landrace and 101 Yorkshire, which were obtained from 7 sires (4 of Landrace and 3 of Yorkshire breed). The gilts that had a smaller weight at birth, showed a smaller daily gain and body weight realized at the end of the test. Lactation duration of 32 days, weight at weaning was not less than 7 kg. During the test of 85 days, the realized average weight was 76 kg, with a gain of 0.90 kg for Landrace gilts, while Yorkshire had smaller one (71 kg) and so smaller daily gain (0.84 kg). With an average age of gilts of 160 days, Landrace gilts reached weight 108 kg, with an average life gain of 0.67 kg, while the Yorkshire gilts reached weight of 101 kg, with an average life gain of 0.62 kg. Tests of significance showed that the sire, breed and weight at birth have a highly significant impact on most of the observed traits and represent a significant source of phenotypic variability in growth traits of tested gilts.
Highlights
The gilts that had a smaller weight at birth, showed a smaller daily gain and body weight realized at the end of the test
Tests of significance showed that the sire, breed and weight at birth have a highly significant impact on most of the observed traits and represent a significant source of phenotypic variability in growth traits of tested gilts
The findings of the negative genetic relationships between fertility and milk production traits on the one hand and traits meatiness on the other one, have led to the formation of specialized pig breeds and lines of high fertility, which are used in the production of hybrid pigs as a final product
Summary
The findings of the negative genetic relationships between fertility and milk production traits on the one hand and traits meatiness on the other one, have led to the formation of specialized pig breeds and lines of high fertility, which are used in the production of hybrid pigs as a final product. The selection criteria in the selection of parents are significantly different As results of these findings have been created and specialized pig farms (commercial farms and the nucleus one). Commercial farms with slightly weaker biosafety regulations, higher number of vaccinations used for the production of hybrid pigs with a minimum expenditure of labour and cost price (Vidovic et al, 2011; Vidovic and Subara, 2011). The efforts of farmers to choose the combination of breeding breeds that give the best results. These genotypes of pigs are far more sensitive than older more traditional genotypes, and great attention must be given to the correct upbringing gilts on the farm (Young and Aherne, 2005)
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