Reproductive performance of Polish Large White and Polish Landrace sows

B. Szostak, V. Katsarov
Abstract. Analyses of traits were conducted on six farms breeding Polish Large White pigs and six breeding Polish Landrace pigs. Farms were selected for the analysis based on their similar environmental conditions and the average size of the sow herds, which ranged from 18.8 to 34.9 sows. The sows were housed in groups in pens with straw. The material for analysis consisted of data from breeding documentation covering the period of 2011–2012. The Polish Large White and Polish Landrace sows on the farms analysed were characterized by a high average number of piglets born alive per litter (11.5–13.3). The high variation in this parameter on many farms confirms that further selection is advisable. The average number of litters obtained per sow per year on most of the farms analysed was lower than in countries in which pig breeding is more advanced. In order to be competitive in pork production, breeders should try to improve the number of litters per sow per year. This can be achieved by means of early weaning of piglets and the earliest possible fertilization of sows after lactation. All of this, however, requires optimal living conditions for the animals and their overall well-being.