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Search Results: 1 - 10 of 39 matches for " Betka Logar "
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MULTIPLE TRAIT ANALYSIS OF GENOTYPE BY ENVIRONMENT INTERACTION FOR MILK YIELD TRAITS IN SLOVENIAN CATTLE
Betka Logar,?pela Malovrh,Milena Kova?
Poljoprivreda (Osijek) , 2007,
Abstract: The objective of the study was to evaluate genotype by environment interaction (GxEI) for yield traits in Holstein, Simmental and Brown breed cattle in Slovenia using multiple trait analysis. Data from Slovenian milk-recording scheme was used. The lactation records on cows having first to third calving in the period 1990-2004 and milk, protein and fat yield in 305 days were studied. The variables used to characterize the environment were herd-year averages of each trait. The multiple trait analysis was done using the highest and lowest quartiles of the environments. To study the GxEI, animal model methodology and the genetic correlation between the traits were used. GxEI was generally smaller for fat and milk yield than for protein yield. The lowest genetic correlations between high and low environments were estimated for protein yield, especially in Simmental (0.81) and in Brown (0.86) breed. In Holstein the correlation was higher, 0.94. The genetic correlations for fat yield were 0.95 for Brown and Simmental breed and 0.96 for Holstein. For milk yield the estimated genetic correlations were 0.88, 0.92 and 0.96 in Brown, Simmental and Holstein breed, respectively. Differences between variance components obtained in low and high quartile result in the rank of heritabilities from 0.04 to 0.12 in low and from 0.12 to 0.22 in high quartile.
DETECTION OF RECESSIVE MUTATIONS (CVM, BLAD AND RED FACTOR) INHOLSTEIN BULLS IN SLOVENIA
Betka LOGAR,Tatjana KAVAR,Vladimir MEGLI?
Journal of Central European Agriculture , 2008,
Abstract: Detection of recessive mutations that causes complex vertebral malformation (CVM) and bovine leukocyte adhesion defi ciency (BLAD) in Holstein cattle is especially required for bulls, which are used for artifi cial insemination (A.I.); these enable elimination of carriers from the A.I. programs and therefore prevent transmission of unwanted mutations to a large number of offspring. Some breeders are also interested in the identifi cation of carriers of recessive allele for red and white coat colour (Red factor). Here, we performed genetic tests for detection of mutations associated with CVM, BLAD and Red factor using methods previously reported or modifi ed methods. Analysis of Holstein bulls, which were recommended for A.I in Slovenia in the years 2007 and 2008, revealed four (10 %) carriers of CVM, and two (5.4 %) carriers of red gene, while all bulls were non-carriers of BLAD.
Genetic parameters of Conformation Traits in Brown, Simmental and Holstein Breed Calves in Slovenia
Betka Logar,Miran ?tepec,Klemen Poto?nik
Agriculturae Conspectus Scientificus (ACS) , 2011,
Abstract: Conformation traits of Brown, Simmental and Holstein breed calves were studied to estimate the genetic and environmental parameters using data from two classification systems. Calves were classified in the period 2000 – 2010 between the age of one to 51 days. Beside the chest girth as a measurement in cm five traits were scored. At the beginning, the traits such as muscularity, form, body depth, body length and width were scored on the scale from 1 to 3 or 1 to 9 while in the year 2008 the system of classification changed to scores from 1 to 5 for all traits. Due to high variability of the data their thorough cleaning and homogenisation was required. Uni- and bivariate analyses using animal model methodology were performed. The effects of technician by year of classification, classification age class, birth season in months by years were treated as fixed and the herd by year of classification and additive genetic effect as random. Heritability estimates for data from the new classification system are rather higher (0.05-0.29) than those from the old system. Genetic correlations between estimates of two classification systems are very high, i. e. in a range from 0.74 to 0.97, which indicates a strong genetic relationship between the old and the new system of classification. The only exceptions were form and body depth in Simmental breed. In the chest girth the estimates of heritability from 0.16 to 0.27 were obtained.
Analysis of longevity in Slovenian holstein cattle
Klemen Poto nik, Vesna Gantner, Jurij Krsnik, Miran tepec, Betka Logar, Gregor Gorjanc
Acta agriculturae Slovenica , 2011, DOI: 10.2478/v10014-011-0025-5
Abstract: The longevity of Slovenian Holstein population was analysed using survival analysis with a Weibull proportional hazard model. Data spanned the period between January 1991 and January 2010 for 116,200 cows from 3,891 herds. Longevity was described as the length of productive life - from first calving till culling or censoring. Records above the sixth lactation were censored to partially avoid preferential treatment. Statistical model included the effect of age at first calving, stage of lactation within parity, yearly herd size deviation, season defined as year, herd, and sire-maternal grandsire (mgs). Some effects had time varying covariates, which lead to 1,839,307 or on average 16 elementary records per cow. Herd and sire-maternal grandsire effects were modelled hierarchically. Pedigree for sires and maternal grandsires included 2,284 entries. Estimated variance between herds was 0.12, while between sire variance was 0.04. Heritability was evaluated at 0.14. Genetic trend for sires was unfavourable, but not significant. A further research is needed to define the required number of daughters per sire and the dynamics of genetic evaluation for sires whose majority of daughters still have censored records.
Blank Gaze and Vacant Skull—Cinema & Brain(s) & (Dis-)Affection in Recent Mindful and Mind-Related US Cinema
Betka, Benjamin
COPAS : Current Objectives of Postgraduate American Studies , 2012,
Abstract: Screens and brains are peculiar processual frames and/or framing devices. This essay which is part of a larger project intends to demonstrate the value of neurocinematic frames for both cultural studies and scientific considerations. The fusion of theories of cinema and neuroscience needs a media theory that is informed by the affective turn in the humanities. The delicacy of neurocinematic frames becomes visible once they get torn and ruined by diverse depressed, entropic, and disaffected minds as trains of thought that seem to disperse and combust. These phenomena give the project traction and focus. A certain kind of film theory might challenge traditional scholarly concepts of the mind but leads towards a fertile enunciation of the volatile and fragile (en-)trails of thought itself.It is a film theory that includes autopoietic psychological systems in the sense of Humberto Maturana and others which was formulated first and foremost by Gilles Deleuze in his two monographs on movement-images and time-images (2006, 2009).
Constructions over localizations of rings
Alessandro Logar
Le Matematiche , 1987,
Abstract: In this paper we construct a category of effective noetherian rings in which linear equations can be “solved”. This category is closed with respect to some important constructions like trascendental extensions, quotientations, finite products and localizations with respect to a large class of multiplicatively closed systems. Hence it gives a definition of “constructive” rings.
Improvement the DTC system for electric vehicles induction motors
Arif Ali,Betka Achour,Guettaf Abderezak
Serbian Journal of Electrical Engineering , 2010, DOI: 10.2298/sjee1002149a
Abstract: A three-phase squirrel-cage induction motor is used as a propulsion system of an electric vehicle (EV). Two different control methods have been designed. The first is based on the conventional DTC Scheme adapted for three level inverter. The second is based on the application of fuzzy logic controller to the DTC scheme. The motor is controlled at different operating conditions using a FLC based DTC technique. In the simulation the novel proposed technique reduces the torque and current ripples. The EV dynamics are taken into account.
Glass-ceramics obtained by the crystallization of basalt
Coci? M.,Logar M.,Matovi? B.,Poharc-Logar V.
Science of Sintering , 2010, DOI: 10.2298/sos1003383c
Abstract: The possibility to obtain glass-ceramics from basalt from the locality on Vrelo (Kopaonik mt.) is shown in this paper. The parent rock was ground to fraction -0.4 +0.1 mm, and then melted at 1250 - 1300°C. The crystallization melted bazaltic glass at 950°C during the time interval of 3 hours caused synthesis of a glass-ceramic material with a microstructure that has excellent mechanical properties according to the determined dynamic modulus of elasticity and uniaxial compresive strength. The phase composition of the obtained glass ceramic material was determined by XRPD using Rietveld refinement and SEM. Two phases were found: pyroxene which corresponds to omphacite of the composition (Na0.199 K0.180 Ca0.471 Mg0.249)1.1(Mg0.271Fe0.299Al0.430)1.0(Si1.704Ti0.046Al0.250)2.0O6 and glass with an approximate relationship 69:31.
Normative status of libraries: academic libraries between norms and reality
Alenka Logar-Ple?ko
Knji?nica : Revija za Podro?je Bibliotekarstva in Informacijske Znanosti , 1998,
Abstract: Norms and standards of education on academic levels published in the Official paper of RS, 1992, No. 39, stipulate two elements for University libraries, which determine the number of employees in a library. The first takes into consideration the number of enrolled students - with the lowest number of 120 enrolled students - and the second the number of books, with the lowest number of 40,000 bibliographic units. But these norms do not take into consideration and do not evaluate ali other visitors. They also do not consider book lending data and above ali do not take into account - with the exception of handling the library material -numerous other tasks, which are - due to the changed ways of studies - as a consequence also apparent in demands and expectations of the visitors of our libraries.
Serological evidence for human cystic echinococcosis in Slovenia
Jernej Logar, Barbara Soba, Tadeja Kotar
BMC Infectious Diseases , 2008, DOI: 10.1186/1471-2334-8-63
Abstract: Between January 1, 2002 and the end of December 2006, 1323 patients suspected of having echinococcosis were screened serologically by indirect haemagglutination assay (IHA). For confirmation and differentiation of Echinococcus spp. infection, the sera of IHA-positive patients were then retested by western blot (WB).Out of 127 IHA-positive sera, 34 sera were confirmed by WB and considered specific for CE. Of 34 sera of CE-positive patients sera, 32 corresponded to the characteristic imaging findings of a liver cysts and 2 to those of lung cysts. The mean age of CE-positive patients was 58.3 years. No significant differences were found between the CE-positive patients in regard to their sex.In the study, it was found out that CE was mostly spread in the same area of Slovenia as in the past, but its prevalence decreased from 4.8 per 105 inhabitants in the period 1956–1968 to 1.7 per 105 inhabitants in the period 2002–2006. In spite of the decreased prevalence of CE in the last years, it is suggested that clinicians and public health authorities, especially in the eastern parts of Slovenia where the most CE patients come from, should pay greater attention to this disease in the future.Human cystic echinococcosis (CE) is caused mainly by the larva of tapeworm Echinococcus granulosus. E. granulosus occurs worldwide. It is 2–7 mm long and is harboured in the intestine of definitive hosts, typically dogs and other canids which are infected by the ingestion of offal containing larval stage of E. granulosus. The tapeworm eggs are excreted with the faeces of these animals. Following accidental ingestion of these eggs, CE in larval stage may develop in ungulates and sometimes in humans as intermediate hosts, usually in the liver or lung [1]. The aim of this study was to examine serologically whether the Slovenian patients suspected of having cystic echinococcosis had been infected by the larvae of E. granulosus.Between 1 January 2002 and the end of December 2006, 1323 patients
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