RELATIONSHIP BETWEEN PERFORMANCE AND SOME BIOLOGICAL PROPERTIES OF BLOOD SERUM (PROTEIN AND LIPIDS) IN GROWING PIGS

Cilj ovoga istraživanja je određivanje stupnjeva povezanosti sadržaja u serumu proteina, albumina, globulina i lipida - kao veoma značajnih bioloških svojstava krvi sa važnijim proizvodnim svojstvima (prirast, debljina slanine i mesnatost glavnih dijelova) muških grla rase švedski landras. Ova grla su kastrirana na početku unilateralno, a kasnije pred kraj tova vađenjem i drugog testisa. Vađenje uzoraka krvi vršeno je u tri perioda, tj, sa oko 33 kg i 3-3,5 mjeseci (I period), zatim sa 78 kg i 5-5,5 mjeseci (II period), i najzad sa 102 kg i 66,5 mjeseci kod klanja. Na osnvu dobivenih rezultata utvrđeno je da su komponente proteina kao i lipida dobro povezane, odnosno korelirane sa proizvodnim svojstvima u sva tri perioda. Najpouzdaniji pokazatelji proizvodnih svojstava svinja u ranijem stadiju razvoja su alfa lipidi, u srednjem stadiju su dobri pokazatelji alfa globulini, a na kraju tova ukupni proteini i gama globulini.Assesment are based on the content of total protein, albumin, globulin and lipids in blood serum and performance properties (live gain, back fat thickness and meatness of main parts of carcass) of Swedish Landrace male pigs, which are castrated at begining unilateraly at ave. 33 kg 1.w., and later on excised second testis at ave. og 78 kg l.w. Blood is taken 18 hours after fasting: at 33 kg l.w. (Ist period), at 78 kg l.w. (IInd period) and during bleeding at slaughter with average of 102 kg l.w. (IIIrd peroid). On the base of obtained results it could be said following: Protein components and also lipids are well correlated with performance of pip in three periods. More expressed connection exist between daily gain, back fat thickness and meat yield in main parts of carcass with total protein (4,629 to -0,834 and 0,639 to 0,791) and gamma globulin (-0,563 to 4,926 and 0,796 to 0,858) in third period, while this is moderateor weak in first and second period. Albumin is more expressed connected with performance in first period (4,516 to - 0,5!)6 and 0,576 to 0,766), but alpha globulin in second period (544 to -0,708 and 0,464 to 0,603). From lipid components more expressed connection with performance are showed form alpha lipid in the first (-0,712 to -0,830 and 0,599 to 0,697) and third period (-0,469 to -0,754 and 0,588), but neutral lipids (-0,365 to -0,546 and 0,555 to 0,806) and beta lipids (-0,520 to -0,679) in second period, while is slightly less expressed in third period. Most reliable components for pig performance prediction is alpha lipid in earlier period of growing animals, then in medium period of growing good component is alpha globulin, but on the end of fatteing are total protein and gamma globulin