Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS

1 st WorkshopXIII International Feed Technology SymposiumThe measured contents of iron and manganese in beef cattle tissues are given in Tables 5and 6, respectively. The iron content in the muscular tissue ranged from 22.67 - 78.96mg/kg, with an average being 38.87 mg/kg. The content of manganese varied from 0.17 -0.52 mg/kg, averaging 0.34 mg/kg. The iron content of the liver and kidney tissuesranged from 45.27 - 88.37 and 57.43 - 121.14 mg/kg, the average values being 67.60mg/kg and 78.83 mg/kg, respectively. The manganese content of the liver ranged from1.81-2.86 mg/kg, averaging 2.37 mg/kg, whereas the kidney content fell within a rangeof 0.90-1.30 mg/kg giving an average of 1.12 mg/kg. The obtained liver manganesevalues complied with those (0.26 mg/100 g) reported by Rogovski, B. [24].The measured results on the iron content of muscular tissue showed higher values thanthose of 3.00 mg/100 g determined by Rogovski, B. [24], whereas the iron content of theliver reported by the cited author was higher than in this study (12.00 mg/100 g). Theiron content of the kidneys was almost identical to the values obtained by Rogovski, B.[24].The iron contents of the leg muscles (1.40 - 3.04 mg/kg), shoulder blade muscles (1.22 -2.56 mg/kg) and head meat (1.42 - 3.57 mg/kg) of beef cattle reported by Djujić Ivana etal. [8] were significantly lower than our results.Skalická, M. et al. [26] compared the results on iron and manganese contents of themuscles in beef cattle sampled from different farms in Eastern Slovakia. The averageiron values for the muscles were 23.787 mg/kg -1 in farm A cattle and 15.788 mg/kg -1 infarm B cattle. The maximum values obtained were 48.600 mg/kg -1 and 33.550 mg/kg -1 ,respectively. The comparison revealed lower iron concentrations in the farm B beefcattle. The average manganese values in the muscles of the farm A and farm B cattlewere 0.242 mg/kg -1 and 0.566 mg/kg -1 , respectively.The average muscle manganese concentration reported by Bruggemann, J &Kumpulainen, J. [5] was 1.2 mg/kg -1 . The obtained results conformed to those of Gallo,M. et al. [10], who suggested that the highest manganese concentrations in emissionexposedareas were deposited mainly in internal organs of beef cattle. Manganeseconcentrations were highest in the liver, bone and kidney and lowest in the skeletalmuscles. Manganese concentrations were rather stable in most major tissues of adultanimals.Valenzuela Carolina et al. [31] determined the content of total iron (TFe) and heme iron(HeFe) in major cuts of meat and principal viscera of bovine origin. 55 Fe (30 mCi) wasinjected into two 4-month-old calves. Triplicate samples of the 12 basic American cutsof meat and major viscera were obtained from each specimen. The samples were aciddigested and their iron content was read by AAS. Duplicate samples of the basic cuts ofmeat and major viscera were analyzed to determine the concentration of 55 Fe using adouble isotopic technique. The mean and standard deviation of Tfe for all cuts was1.4 ± 0.3 mg/100 g of meat. The mean TFe for organs was (mg/100 g): 0.9 ± 0.1brain, 3.0 ± 0.05 kidney, 3.2 ± 0.04 heart, 5.7 ± 0.2 lung, 6.0 ± 0.1 liver, and 31.2 ± 0.4spleen. HeFe was 64% of TFe in meat and 72.8% in spleen, 53.8% in lung, 35.7% inbrain, 35.0% in kidney, 27.3% in heart and only 13.6% in liver. Blood contained 85.5%of the radioisotope and only 1.4% was found in muscle and 1.6% in viscera. The resultssuggest that bovine cuts of meat have a low variation in Tfe and that HeFe comprisesmore than 60% of Tfe.313