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

1 st WorkshopXIII International Feed Technology Symposiumbelow the levels for the waters in the region of Smederevska Palanka, Srbobran andRekovac reported by Plavšić, K. [21].Sodium concentration in the water ranged from 1.78 - 5.56 mg/l, the average value being2.81 mg/l. Significantly higher sodium concentrations in the waters in the regions ofSmederevska Palanka (34.16 - 69.72 mg/l), Rekovac (4.30 - 56.90 mg/l) and Srbobran(5.80 - 14.20 mg/l) were detected by Plavšić, K. [21]. The sodium content in the watersin the region of Kraljevo (the Ribnica and Studenica basins) was reported byVukašinović Marija et al. [33, 34] to be considerably lower.The calcium concentration in the water used for beef cattle ranged from 6.22-17.56 mg/l,with an average of 12.98% mg/l, which was significantly lower than the values obtainedby Vukašinović Marija et al. [33] for the Ribnica and Studenica rivers and thosemeasured by Plavšić, K. [21] for the waters in the regions of Smederevska Palanka,Rekovac and Srbobran.The maximum tolerable levels of potassium, sodium and calcium, as set in theRegulation on the Hygienic Safety of Drinking Water (“The Official Gazette of the FRY”42/98) [22] are 12.0, 150 and 200 mg/l water, respectively, being considerably above thelevels measured in this study.The obtained results on potassium, sodium and calcium concentrations in the CFM usedfor beef cattle are given in Table 4. The average contents of potassium, sodium andcalcium were 11,283.07 mg/kg, 1,340.00 and 9,623.14 mg/kg, respectively. TheRegulation on the Quality and Other Requirements for Feedstuffs (“The Official Gazetteof the FRY” 20/12) and the Amendments No. 38/2001 [23], prescribe maximum levels ofcalcium and sodium in complete feeds for beef cattle at 0.9-1.1% and 0.2-0.3%,respectively, whereas the potassium level is not prescribed. The measured sodiumconcentration in the CFM for beef cattle was below the required regulated amount,whereas the calcium content conformed to the quantity prescribed.Table 5. Average contents of iron (Fe) in the muscular tissues, liver and kidney of beef cattle(mg/kg)Muscular tissue Liver Kidneyx 38.87 67.60 78.83Sd 16.42 13.10 20.63Cv 42.23 19.38 26.17Iv 22.67 - 78.96 45.27 - 88.37 57.43 - 121.14Table 6. Average contents of manganese (Mn) in the muscular tissue, liver and kidney ofbeef cattle (mg/kg)Muscular tissue Liver Kidneyx 0.34 2.37 1.12Sd 9.70 x 10 -2 0.32 0.13Cv 28.68 13.69 11.95Iv 0.17 - 0.52 1.81 - 2.86 0.90 - 1.30312