Genetički resursi u svinjarstvu - Moravka

Objective of the paper was to present characteristics of native/autochthonous pig breed Moravka, reared in the previous century, as well as results relating to activities such as collection, selection, identification and production performance of investigated heads in 2004. Moravka is one of three pig breeds in Serbia included in the programme of preservation of animal genetic resources.U našoj zemlji su evidentirane tri autohtone rase svinja: mangulica, moravka i resavka. Moravka i resavka su dve autohtone rase svinja koje su u opasnosti da nestanu, te su obuhvaćene programom očuvanja i održivog korišćenja. U radu su prikazane karakteristike autohtone rase svinja moravka gajene u prošlom veku (Tabela 1 i 2) kao i rezultati rada na sakupljanju, odabiranju, identifikaciji i proizvodnim osobinama grla rase moravka od 2004. godine (Tabela 3 i 4). Prosečna telesna masa krmača (u jednom zapatu) starosti od 3 do 5 godina, bila je 77,67 kg a visina grebena 63,83 cm. Krmače su oprasile prosečano 7,20 prasadi sa variranjem od 5 do 14. U tovu od 31,92 do 94,33 kg prosečan dnevni prirast je bio 385g/dan a konverzija hrane 3,74 kg kukuruza za kilogram prirasta telesne mase. Prosečan dnevni prirast je bio najveći izmedju 3. i 4. merenja (514 g/dan) što odgovara uzrastu od 253 do 283 dana

Hydrodynamics of a self-agitated draft tube airlift reactor

The main hydrodynamic characteristics of a novel-constructed, self-agitated draft tube airlift reactor (DT-ALR) were investigated. Ten impellers, driven only by the means of gas throughput and induced liquid circulation, were inserted in the draft tube. The insertion of impellers caused bubble breakup and reduction of both mean bubble size and coalescence, even under the conditions of high gas throughputs. Although the impellers induced energy losses, the resistance to the flow was relatively lower due to their rotation, unlike the internals used in other research reported in the literature. In comparison to the conventional configuration of a DT-ALR, it was found that the presence of impellers led to significant changes in hydrodynamics: riser gas holdup and mixing time increased, while overall gas holdup and liquid velocity in the downcomer decreased. [Projekat Ministarstva nauke Republike Srbije, br. 172025

Uticaj različitih fiksnih faktora na osobine kvaliteta trupa svinja

The effect of sire breed (Swedish landrace and large White), sires within the breed, genotype, sex and season of birth of offspring on age at slaughtering, back fat thickness measured on three points (withers, center of the back and rump), length of carcass side Os pubis-atlas and Os pubis-first rib, yield and share of meat in warm carcass sides of average mass of 81,39 kg, using Yugoslav standards, was investigated. Results obtained show that investigated traits of offspring varied between sire breeds, genotype and sex (P lt 0,01). Sires within Swedish Landrace influenced (P lt 0,01) variation of back fat thickness (center of the back, rump, back+rump), age at slaughtering, length of carcass side Os pubis-atlas and Os pubis-first rib, but no effect was established on yield and share of meat (P>0,05). Sires within Large White breed had no effect on age at slaughtering and length of carcass side (P>0,05), whereas on other traits influence was demonstrated (P lt 0,01 and P lt 0,05). Season of birth had influence in the second model (P lt 0,05) on age at slaughtering and in both models on length of carcass side Os pubis-atlas and Os pubis-first rib (P lt 0,01 and P lt 0,05), whereas on other investigated traits no effect was established (P>0,05). Age, back fat thickness, length of carcass side and yield of meat were dependent on the mass of warm carcass sides.Ispitivan je uticaj rase oca (švedski landras i veliki jorkšir), očeva unutar rase, genotipa, pola i sezone rođenja potomaka na uzrast pri klanju, debljinu slanine merene na tri mesta (greben, sredina leđa i krsta), dužine polutke Os pubis-atlas i Os pubis-prvo rebro, prinos i udeo mesa u toplim polutkama prosečne mase 81,39 kg, primenom Jugoslovenskog standarda. Rezultati koji su dobijeni pokazuju da ispitivane osobine potomaka varirale između rase očeva, genotipa i pola (P lt 0,01). Očevi unutar rase švedski landras su uticali (P lt 0,01) na variranje debljine slanine (sredina leđa, krsta, leđa+krsta) i (P lt 0,05) na uzrast pri klanju, dužine polutke Os pubis-atlas i Os pubis-prvo rebro dok na prinos i udeo mesa nije ispoljen uticaj (P>0,05). Očevi unutar rase veliki jorkšir nisu uticali na uzrast pri klanju i dužine polutki (P>0,05) dok su na ostale osobine ispoljili uticaj (P lt 0,01 i P lt 0,05). Sezona rođenja uticala je u drugom modelu (P lt 0,05) na uzrast pri klanju i u oba modela na dužine polutke Os pubis-atlas i Os pubis-prvo rebro (P lt 0,01 i P lt 0,05) dok na ostale ispitivane osobine nije utvrđen uticaj (P>0,05). Uzrast, debljine slanine, dužine polutke i prinos mesa zavisili su od mase toplih polutki

Pressure drop in a countercurrent gas-flowing solids-packed bed contactor

The equations for prediction of pressure drop in countercurrent gas-flowing solids-packed bed contactors are proposed. The correlations are based on all available data for various constructions, packing elements, and gas and flowing solids properties. The equations give good predictions and are given separately for preloading and loading zones, together with the correlation for the determination of the loading point

Low-temperature plasma modification of wool

Low-temperature plasma treatment causes modification of specific wool properties (felting shrinkage, wettability, dyeability, printability, pilling) as a result of interaction between active plasma particles and fibre surface. The formation of new functional groups on the fibre surface, physical sputtering and reactive plasma etching occur during the plasma treatment. The changes are confined to the wool surface, leaving the fibre bulk properties unchanged. Adequate choice of plasma treatment parameters provides options to achieve specific plasma-chemical reactions and consequently, the desired effects on the wool. This paper considers the influence of low-temperature plasma on the changes of chemical composition, morphological and electrokinetical properties of wool

Static holdup in Gas - Flowing solids - Fixed bed contactors

Static holdup was investigated experimentally and theoretically in gas - flowing solids - fixed bed bench-scale contactors. Diverse packing elements were used: Raschig rings, ceramic beads, crushed stone and glass beads. Four different flowing solids particles were examined: sand. propant, alumina and glass. A wide range of solid fluxes and gas velocities were used in this study. The experimental results showed a significant influence of the geometry of the packing elements oil static holdup. The physical properties of the flowing solids also influenced static holdup. A moderate influence of solids flux and a minor influence of gas velocity were observed. An empirical correlation for the prediction of static holdup was developed from theoretical and numerical analyses, based on the available experimental data. This simple equation well predicts static holdup and it contains one parameter that has to be measured in the desirable system - dynamic holdup. Alternatively. dynamic holdup can be predicted by previously proposed models. One of those models was integrated into the proposed correlation for static holdup, which gave quite good results

Recycled wool-based nonwoven material as an oil sorbent

The aim of this study was to highlight the possibility of using recycled wool-based nonwoven material as a sorbent in an oil spill cleanup. This material sorbed higher amounts of base oil SN 150 than diesel or crude oil from the surface of a demineralized or artificial seawater bath. Superficial modification of material with the biopolymer chitosan and low-temperature air plasma led to a slight decrease of sorption capacity. Loose fibers of the same origin as nonwoven material have significantly higher sorption capacities than investigated nonwoven material. White light scanning interferometry analysis of the fibers suggested that roughness of the wool fiber surface has an important role in oil sorption. The laboratory experiments demonstrated that this material is reusable. Recycled wool-based nonwoven material showed good sorption properties and adequate reusability, indicating that a material based on natural fibers could be a viable alternative to commercially available synthetic materials that have poor biodegradability