Založba Univerze v Ljubljani / University of Ljubljana Press
Doi
Abstract
Some carcass traits and muscle fiber characteristics of m. Longissimus dorsi (MLD) in pigs of Turopolje breed (T) and crossbreds TCSL were analyzed. The hogs T (n = 19, 568 ± 20 days) and TCSL (n = 10, 575 ± 27 days) were progenies of the same boar, T3HB, and sows of Turopolje breed and crossbred CSL (♂C Hypor line × ♀SL, Swedish Landrace). All pigs were reared and fattened in the outdoor system, according to traditional Croatian technology of low input. Live (LW) and carcass weight (CW) and some carcass traits and chemical composition of muscle and fat tissues were analyzed. In the carcass, the lean percentage (L%) was calculated on the basis of back fat thickness (BF) and MLD thickness, according to “two point” method (CRO, Regulation, NN 85/05). The samples of MLD from the left side at the 13/14th rib level were taken after slaughtering (5 min.) and frozen in liquid nitrogen until histo-morphological analysis (diameter of slow twitch oxidative, SO; fast twitch glycolytic, FG; and fast twitch oxidative, FOG fiber types). After chilling carcass (24 h, at + 4 ºC), the samples of MLD and the belonging back fat were taken from the same place for analysis of chemical composition (water W, protein P, lipid L, ash A). According to the estimated results the pigs of Turopolje breed and TCSL significantly differed as follows: LW (95.31 and 117.10 kg), CW (77.11 and 97.50 kg), BF (31.68 and 28.00 mm), MLD dept (50.16 and 60.10 mm), L (45.25 and 47.69%), SO (33.69 and 44.24 μm), and FG (38.48 and 47.60 μm). The chemical content of muscle and fat tissues was not significantly different between investigated pigs.Analizirali smo nekatere lastnosti klavnih polovic in lastnosti mišičnih vlaken v m. longissimus dorsi (MLD) pri turopoljskih prašičih (T) in TCSL križancih. Merjasci T (n = 19, 568 ± 20 dni) in TCSL (n = 10, 575 ± 27 dni) so bili potomci istega merjasca, T3HB in svinj turopoljske pasme in križancev CSL (♂C Hypor linija × ♀SL, švedska landrace). Prašiči so bili vzrejeni in spitani zunaj v prosti reji v skladu s tradicionalno hrvaško tehnologijo majhnega inputa. Analizirali smo telesno maso in maso klavnih polovic ter nekatere lastnosti klavnih polovic in kemično sestavo mišičnega in maščobnega tkiva. V klavnih polovicah smo delež pustega mesa izračunali na osnovi debeline hrbtne slanine in MLD po dvo-točkovni metodi (CRO, Pravilnik NN 85/05). Vzorce leve MLD med 13. in 14. rebrom smo odvzeli po klanju (5 minut), jih zamrznili v tekočem dušiku za čas do histomorfoloških analiz (premer počasi krčljivih oksidativnih, SO; hitro krčljivih glikolitični, FG; in hitro krčljivih oksidativnih FOG tipov mišičnih vlaken). Po ohlajanju polovic (14 ur pri + 4 ºC) smo vzorce MLD in pripadajoče hrbtne slanine odvzeli na istem mestu in določili kemično sestavo (voda, beljakovine, maščobe, pepel). Po ocenjenih rezultatih se turopoljski prašiči in križanci TCSL pomembno razlikujejo v sledečih lastnostih: telesna masa (95,31 oz. 117, 10 kg), masa klavnih polovic (77, 11 oz. 97,50 kg), debelina hrbtne slanine (31,68 oz. 28,00 mm), debelina MLD (50,16 oz. 60,10 mm), delež mesa (45,25 oz. 47,69 %), premer SO mišičnih vlaken (33,69 oz. 44,24 μm) in premer FG mišičnih vlaken (38,48 oz. 46,60 μm). Kemična sestava mišičnega in maščobnega tkiva se ni pomembno razlikovala med preiskovanima pasmama prašičev
