INFLUENCE OF GENOTYPE ON MEAT YIELD ESTIMATION IN SWINE CARCASSES

Influence of genotype on estimation of meat yield in swine carcasses w as researched in this paper. Four groups of pigs (15 males and 15 fema les, n = 30 in each group) were included in the research. In each grou p there were pigs of different genotypes as follows: 1st group = (LW x GL) x GL; 2nd group = (LW x SL) x GL; 3rd group = (SL x LW) x LW and 4th group = pigs of unknown genotype. Pigs were slaughtered in several slaughterhouses in east Slavonia. Meat yield was determined by total dissection (TD), according to Weniger et al. (1963) and estimated by 3 different equations. First equation (PF) was taken from a current Cro atian regulation and other two (MF2 and MF3) were obtained by research es of Kusec (1996). Equations MF2 and MF3 appeared to be more appropri ate for lean meat estimation in all groups of pigs, except for the 3rd group, which had the lowest objectively determined (TD) meat yield. I n this group equation PF predicted lean meat percentage better than th e other two. According to average meat yield obtained by dissection (T D) and by equations MF2 and MF3, swine carcasses from the Ist group we re classified in class E. Equation PF classified the same carcasses in class U. On the basis of average objectively determined (TD) and esti mated meat yields (MF2 and MF3) swine carcasses from 2nd group were cl assified in class U, while equation PF classified them in class R. Swi ne carcasses from 3rd group were classified in class R on the basis of objective determination and estimation by equation PF, while equation s MF2 and MF3 classified these carcasses in class U. Carcasses of 4th group of pigs were on the border between classes U and R according to total dissection (TD), while estimations by all three equations classi fied these carcasses in class R.