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Objective of this study is to evaluate growth pattern of boilers fed diets containing different oils. Data for this study were obtained from an experiment involving 160 unsexed one day old chicks of Ross 308 cross randomly allocated to four dietary treatments (n=40) with five replicates in each of them (eight birds per replicate) over 42 days. Feeding experimental diets was introduced in the last 21 days. Composition of experimental diets (C, D1, D2 i D3) was the same, containing different levels of added oils. Control diet contained 6% of sunflower oil. D1, D2 and D3 diets contained added oils in the following combinations: 1% fish oil + 2% linseed oil + 3% rapeseed oil (D1), 1.5% fish oil + 1.5% linseed oil + 3% rapeseed oil (D2) and 2% fish oil + 1% linseed oil + 3% rapeseed oil (D3). All diets were isoenergetic and contained 0.015% vitamin E. Gompertz model fits the data obtained from weekly weighing of birds. The model indicated high accuracy with the determination coefficient of over 99.9%. Predicted mature weight of birds, initial specific growth rate per week, rate of exponential decay of the initial specific growth rate, age of birds at inflection point, weight at the inflection point, and maximum weight gain at inflection point for each dietary treatment were subjected to one-way variance analysis. A positive effect of dietary omega-3 fatty acids on most of examined growing curve parameters has been established.

U radu su prikazani rezultati istraživanja opterećenosti teškim metalima na relaciji tlo-biljka-životinja područja Srednje-bosanskog kantona. Istraživanja su obuhvatila analizu sadržaja kadmija (Cd), žive (Hg) i željeza (Fe) u jetrenom i bubrežnom tkivu domaće janjadi. S područja općine Kakanj žrtvovano je 8 janjadi, od kojih su uzeti uzorci tkiva jetre i bubrega, a Zenice 7 janjadi, od kojih su također uzeti uzorci tkiva jetre i bubrega. Sadržaj teških metala (Cd, Hg i Fe) u uzetim uzorcima, utvrđen je na ICP-MS (masena spektrometrija s induktivno spregnutom plazmom), u skladu s evropskim standardima (EN 13805 : 2002, IDT) i (EN 15763, 2009, IDT). Utvrđena srednja količina Cd u uzorcima tkiva jetre s područja općine Kakanj iznosila je 0,115, a Zenice 0,261 mg/kg. Srednja vrijednost količine Cd u uzorcima tkiva bubrega sa područja općine Kakanj iznosila je 0,197, a Zenice 0,476 mg/kg. Sadržaj kadmija je veoma varijabilan na oba lokaliteta. Nije utvrđena statistički značajna razlika između lokaliteta. Općenito, sadržaj kadmija je ispod gornje granice dozvoljene količine prema Direktivi Europske Komisije. Utvrđene količine Fe na oba istraživana lokaliteta su znatno ispod gornje granice dozvoljenih vrijednosti. Na oba lokaliteta u uzetim uzorcima istraživanih tkiva nije utvrđena prisutnost žive.

UDK 636.2:66.074.32(497.6) At livestock farms most part of nitrogen arrives as purchased products (fertilizer, animal feed and purchased animals). Within the boundaries of the farm, nitrogen recycles between the livestock and crop components. Finally, nitrogen exit a livestock operation unit preferably as managed outputs (meat, crops and manure) sold off the farm. Difference between the inputs and the managed outputs represents an itrogen balance that can be an indicator of environmentally sustainable production. Nitrogen (im)balance consider only amount of the nutrient that cross the border of the farm. In ideal conditions the nitrogen input/output ratio should be 1:1. Some nitrogen exits the farm as losses to the environment (nitrates in groundwater, ammonia volatilized into the atmosphere, and nitrogen into groundwater and surface water). A study was conducted on five small poultry farm in order to determine whole farm nitrogen balance as difference between total nitrogen inputs (one day chickens, litter, animal feed) and outputs (meat, dead animals and manure). Selected farms differ according to capacity (ranging from 5,000 to 40,000 birds), producers of poultry feed, type and length of manure storage as well as other sensible farming practice which could influence on nitrogen balance. Collection of data on all farms is done using a questionnaire. Nitrogen content in all substrates (feed, manure, litter) was determinate by Kjeldahl procedure. The results of the whole farm nitrogen balance with the recommendations of its balancing in order to reduce the negative environmental implications are presented in the paper.