Abstract
The researches were made on 482 suckling pigs from 40 mother sows belonging to Landrace and Large White race. The sows were in third and fourth lactation and they were breed in industrial system. In average there were 12.2 suckling pigs. Considering the weight of the first suckling pig 100% this gradual decrease till the last one to 65-85%. The medium weight of the 4 suckling pigs was 1.270kg and the medium mortality 0.70% and to the last 4 was 1.100 kg and the mortality 7.02%. The mortality of the first 5 suckling pigs is 2.5% and gradual increase reaching in the last evaluated pig to 66_100%. The increasing of the mortality is explained by hypoxia and hypoglicemia of the new born evacuated during the second part of the parturition
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