RELATIONSHIP OF THE NUMBER OF STILL-BORN PIGLETS AND THE PIGLET MORTALITY TOWARDS THE PROLIFICACY OF PRIMIPAROUS SOWS

Obavljena su istraživanja s podacima iz matičnog knjigovodstva za 1669 prvopraskinja Bostop generacije 19 Svinjogojske farme Nova Topola. Ustanovljeno je da se je broj mrtvorođenih praščića kretao u ovisnosti o broju oprasenih praščića prema jednadžbi Yr = 0,3966 – 0,1978Xr + 0,0446X²r. Jakost veze izražavao je odnos korelacije µ y/x = 0,2510. Broj odojaka uginulih tijekom dojenja kretao se je u ovisnosti o broju živorođenih prema jednadžbi Yr = 0,3848 - 0,1467Xr + 0,0659X²r. Jakost veze izražavao je odnos korelacije µ y/x = 0,3975 . Zaključeno je da prema navedenome valja prilagoditi postupke u proizvodnji i zaštiti zdravlja, ali – kako razlozi za povećanu mrtvorođenost praščića i smrtnost odojaka nisu algebarske naravi - pri uzgoju na veću rodnost ne mora sc u svakom slučaju očekivati veći broj mrtvorođenih praščića niti veći broj odojaka uginulih tijekom dojenja.Data for 1669 litters dropped in 1989 of primiparous BOSTOP sows belonging to the generation 19 at the Swine Farm Nova Topola have been compiled. lt was established that number of still-born piglets was as high as Yr= 0,3966 - 0,1978Xr + 0,0446X²r according to the number of total born piglets. Correlation was expressed as µ y/x = 0,2510. Number of piglets died during the suckling period of 21 days was as high as Yr = 0,3848 – 0,1467Xr + 0,0659X²r related to the number of piglets born alive. Concelation was expressed as µ y/x= 0,3975. lt has been concluded that the production procedures and the health care have to be adapted to the results of investigations. Causes for higher number of still-born piglets and higher mortality of piglets during the suckling period are not algebraic so it is not obliged to be expected higher losses in the litters of sows bred for higher prolificacy